scripts/checkpatch.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2001, Dave Jones. (the file handling bit)
   3 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   4 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   5 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   6 # Licensed under the terms of the GNU GPL License version 2
   7
   8 use strict;
   9
  10 my $P = $0;
  11 $P =~ s@.*/@@g;
  12
  13 my $V = '0.32';
  14
  15 use Getopt::Long qw(:config no_auto_abbrev);
  16
  17 my $quiet = 0;
  18 my $tree = 1;
  19 my $chk_signoff = 1;
  20 my $chk_patch = 1;
  21 my $tst_only;
  22 my $emacs = 0;
  23 my $terse = 0;
  24 my $file = 0;
  25 my $check = 0;
  26 my $summary = 1;
  27 my $mailback = 0;
  28 my $summary_file = 0;
  29 my $show_types = 0;
  30 my $root;
  31 my %debug;
  32 my %ignore_type = ();
  33 my @ignore = ();
  34 my $help = 0;
  35 my $configuration_file = ".checkpatch.conf";
  36
  37 sub help {
  38         my ($exitcode) = @_;
  39
  40         print << "EOM";
  41 Usage: $P [OPTION]... [FILE]...
  42 Version: $V
  43
  44 Options:
  45   -q, --quiet                quiet
  46   --no-tree                  run without a kernel tree
  47   --no-signoff               do not check for 'Signed-off-by' line
  48   --patch                    treat FILE as patchfile (default)
  49   --emacs                    emacs compile window format
  50   --terse                    one line per report
  51   -f, --file                 treat FILE as regular source file
  52   --subjective, --strict     enable more subjective tests
  53   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  54   --show-types               show the message "types" in the output
  55   --root=PATH                PATH to the kernel tree root
  56   --no-summary               suppress the per-file summary
  57   --mailback                 only produce a report in case of warnings/errors
  58   --summary-file             include the filename in summary
  59   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  60                              'values', 'possible', 'type', and 'attr' (default
  61                              is all off)
  62   --test-only=WORD           report only warnings/errors containing WORD
  63                              literally
  64   -h, --help, --version      display this help and exit
  65
  66 When FILE is - read standard input.
  67 EOM
  68
  69         exit($exitcode);
  70 }
  71
  72 my $conf = which_conf($configuration_file);
  73 if (-f $conf) {
  74         my @conf_args;
  75         open(my $conffile, '<', "$conf")
  76             or warn "$P: Can't find a readable $configuration_file file $!\n";
  77
  78         while (<$conffile>) {
  79                 my $line = $_;
  80
  81                 $line =~ s/\s*\n?$//g;
  82                 $line =~ s/^\s*//g;
  83                 $line =~ s/\s+/ /g;
  84
  85                 next if ($line =~ m/^\s*#/);
  86                 next if ($line =~ m/^\s*$/);
  87
  88                 my @words = split(" ", $line);
  89                 foreach my $word (@words) {
  90                         last if ($word =~ m/^#/);
  91                         push (@conf_args, $word);
  92                 }
  93         }
  94         close($conffile);
  95         unshift(@ARGV, @conf_args) if @conf_args;
  96 }
  97
  98 GetOptions(
  99         'q|quiet+'      => \$quiet,
 100         'tree!'         => \$tree,
 101         'signoff!'      => \$chk_signoff,
 102         'patch!'        => \$chk_patch,
 103         'emacs!'        => \$emacs,
 104         'terse!'        => \$terse,
 105         'f|file!'       => \$file,
 106         'subjective!'   => \$check,
 107         'strict!'       => \$check,
 108         'ignore=s'      => \@ignore,
 109         'show-types!'   => \$show_types,
 110         'root=s'        => \$root,
 111         'summary!'      => \$summary,
 112         'mailback!'     => \$mailback,
 113         'summary-file!' => \$summary_file,
 114
 115         'debug=s'       => \%debug,
 116         'test-only=s'   => \$tst_only,
 117         'h|help'        => \$help,
 118         'version'       => \$help
 119 ) or help(1);
 120
 121 help(0) if ($help);
 122
 123 my $exit = 0;
 124
 125 if ($#ARGV < 0) {
 126         print "$P: no input files\n";
 127         exit(1);
 128 }
 129
 130 @ignore = split(/,/, join(',',@ignore));
 131 foreach my $word (@ignore) {
 132         $word =~ s/\s*\n?$//g;
 133         $word =~ s/^\s*//g;
 134         $word =~ s/\s+/ /g;
 135         $word =~ tr/[a-z]/[A-Z]/;
 136
 137         next if ($word =~ m/^\s*#/);
 138         next if ($word =~ m/^\s*$/);
 139
 140         $ignore_type{$word}++;
 141 }
 142
 143 my $dbg_values = 0;
 144 my $dbg_possible = 0;
 145 my $dbg_type = 0;
 146 my $dbg_attr = 0;
 147 for my $key (keys %debug) {
 148         ## no critic
 149         eval "\${dbg_$key} = '$debug{$key}';";
 150         die "$@" if ($@);
 151 }
 152
 153 my $rpt_cleaners = 0;
 154
 155 if ($terse) {
 156         $emacs = 1;
 157         $quiet++;
 158 }
 159
 160 if ($tree) {
 161         if (defined $root) {
 162                 if (!top_of_kernel_tree($root)) {
 163                         die "$P: $root: --root does not point at a valid tree\n";
 164                 }
 165         } else {
 166                 if (top_of_kernel_tree('.')) {
 167                         $root = '.';
 168                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 169                                                 top_of_kernel_tree($1)) {
 170                         $root = $1;
 171                 }
 172         }
 173
 174         if (!defined $root) {
 175                 print "Must be run from the top-level dir. of a kernel tree\n";
 176                 exit(2);
 177         }
 178 }
 179
 180 my $emitted_corrupt = 0;
 181
 182 our $Ident      = qr{
 183                         [A-Za-z_][A-Za-z\d_]*
 184                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 185                 }x;
 186 our $Storage    = qr{extern|static|asmlinkage};
 187 our $Sparse     = qr{
 188                         __user|
 189                         __kernel|
 190                         __force|
 191                         __iomem|
 192                         __must_check|
 193                         __init_refok|
 194                         __kprobes|
 195                         __ref|
 196                         __rcu
 197                 }x;
 198
 199 # Notes to $Attribute:
 200 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 201 our $Attribute  = qr{
 202                         const|
 203                         __percpu|
 204                         __nocast|
 205                         __safe|
 206                         __bitwise__|
 207                         __packed__|
 208                         __packed2__|
 209                         __naked|
 210                         __maybe_unused|
 211                         __always_unused|
 212                         __noreturn|
 213                         __used|
 214                         __cold|
 215                         __noclone|
 216                         __deprecated|
 217                         __read_mostly|
 218                         __kprobes|
 219                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 220                         ____cacheline_aligned|
 221                         ____cacheline_aligned_in_smp|
 222                         ____cacheline_internodealigned_in_smp|
 223                         __weak
 224                   }x;
 225 our $Modifier;
 226 our $Inline     = qr{inline|__always_inline|noinline};
 227 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 228 our $Lval       = qr{$Ident(?:$Member)*};
 229
 230 our $Constant   = qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
 231 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 232 our $Compare    = qr{<=|>=|==|!=|<|>};
 233 our $Operators  = qr{
 234                         <=|>=|==|!=|
 235                         =>|->|<<|>>|<|>|!|~|
 236                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 237                   }x;
 238
 239 our $NonptrType;
 240 our $Type;
 241 our $Declare;
 242
 243 our $UTF8       = qr {
 244         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 245         | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
 246         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 247         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 248         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 249         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 250         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 251         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 252 }x;
 253
 254 our $typeTypedefs = qr{(?x:
 255         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 256         atomic_t
 257 )};
 258
 259 our $logFunctions = qr{(?x:
 260         printk(?:_ratelimited|_once|)|
 261         [a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 262         WARN(?:_RATELIMIT|_ONCE|)|
 263         panic|
 264         MODULE_[A-Z_]+
 265 )};
 266
 267 our $signature_tags = qr{(?xi:
 268         Signed-off-by:|
 269         Acked-by:|
 270         Tested-by:|
 271         Reviewed-by:|
 272         Reported-by:|
 273         To:|
 274         Cc:
 275 )};
 276
 277 our @typeList = (
 278         qr{void},
 279         qr{(?:unsigned\s+)?char},
 280         qr{(?:unsigned\s+)?short},
 281         qr{(?:unsigned\s+)?int},
 282         qr{(?:unsigned\s+)?long},
 283         qr{(?:unsigned\s+)?long\s+int},
 284         qr{(?:unsigned\s+)?long\s+long},
 285         qr{(?:unsigned\s+)?long\s+long\s+int},
 286         qr{unsigned},
 287         qr{float},
 288         qr{double},
 289         qr{bool},
 290         qr{struct\s+$Ident},
 291         qr{union\s+$Ident},
 292         qr{enum\s+$Ident},
 293         qr{${Ident}_t},
 294         qr{${Ident}_handler},
 295         qr{${Ident}_handler_fn},
 296 );
 297 our @modifierList = (
 298         qr{fastcall},
 299 );
 300
 301 our $allowed_asm_includes = qr{(?x:
 302         irq|
 303         memory
 304 )};
 305 # memory.h: ARM has a custom one
 306
 307 sub build_types {
 308         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 309         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 310         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 311         $NonptrType     = qr{
 312                         (?:$Modifier\s+|const\s+)*
 313                         (?:
 314                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
 315                                 (?:$typeTypedefs\b)|
 316                                 (?:${all}\b)
 317                         )
 318                         (?:\s+$Modifier|\s+const)*
 319                   }x;
 320         $Type   = qr{
 321                         $NonptrType
 322                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
 323                         (?:\s+$Inline|\s+$Modifier)*
 324                   }x;
 325         $Declare        = qr{(?:$Storage\s+)?$Type};
 326 }
 327 build_types();
 328
 329 our $match_balanced_parentheses = qr/(\((?:[^\(\)]+|(-1))*\))/;
 330
 331 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 332 our $LvalOrFunc = qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};
 333
 334 sub deparenthesize {
 335         my ($string) = @_;
 336         return "" if (!defined($string));
 337         $string =~ s@^\s*\(\s*@@g;
 338         $string =~ s@\s*\)\s*$@@g;
 339         $string =~ s@\s+@ @g;
 340         return $string;
 341 }
 342
 343 $chk_signoff = 0 if ($file);
 344
 345 my @dep_includes = ();
 346 my @dep_functions = ();
 347 my $removal = "Documentation/feature-removal-schedule.txt";
 348 if ($tree && -f "$root/$removal") {
 349         open(my $REMOVE, '<', "$root/$removal") ||
 350                                 die "$P: $removal: open failed - $!\n";
 351         while (<$REMOVE>) {
 352                 if (/^Check:\s+(.*\S)/) {
 353                         for my $entry (split(/[, ]+/, $1)) {
 354                                 if ($entry =~ m@include/(.*)@) {
 355                                         push(@dep_includes, $1);
 356
 357                                 } elsif ($entry !~ m@/@) {
 358                                         push(@dep_functions, $entry);
 359                                 }
 360                         }
 361                 }
 362         }
 363         close($REMOVE);
 364 }
 365
 366 my @rawlines = ();
 367 my @lines = ();
 368 my $vname;
 369 for my $filename (@ARGV) {
 370         my $FILE;
 371         if ($file) {
 372                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 373                         die "$P: $filename: diff failed - $!\n";
 374         } elsif ($filename eq '-') {
 375                 open($FILE, '<&STDIN');
 376         } else {
 377                 open($FILE, '<', "$filename") ||
 378                         die "$P: $filename: open failed - $!\n";
 379         }
 380         if ($filename eq '-') {
 381                 $vname = 'Your patch';
 382         } else {
 383                 $vname = $filename;
 384         }
 385         while (<$FILE>) {
 386                 chomp;
 387                 push(@rawlines, $_);
 388         }
 389         close($FILE);
 390         if (!process($filename)) {
 391                 $exit = 1;
 392         }
 393         @rawlines = ();
 394         @lines = ();
 395 }
 396
 397 exit($exit);
 398
 399 sub top_of_kernel_tree {
 400         my ($root) = @_;
 401
 402         my @tree_check = (
 403                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 404                 "README", "Documentation", "arch", "include", "drivers",
 405                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 406         );
 407
 408         foreach my $check (@tree_check) {
 409                 if (! -e $root . '/' . $check) {
 410                         return 0;
 411                 }
 412         }
 413         return 1;
 414     }
 415
 416 sub parse_email {
 417         my ($formatted_email) = @_;
 418
 419         my $name = "";
 420         my $address = "";
 421         my $comment = "";
 422
 423         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 424                 $name = $1;
 425                 $address = $2;
 426                 $comment = $3 if defined $3;
 427         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 428                 $address = $1;
 429                 $comment = $2 if defined $2;
 430         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 431                 $address = $1;
 432                 $comment = $2 if defined $2;
 433                 $formatted_email =~ s/$address.*$//;
 434                 $name = $formatted_email;
 435                 $name =~ s/^\s+|\s+$//g;
 436                 $name =~ s/^\"|\"$//g;
 437                 # If there's a name left after stripping spaces and
 438                 # leading quotes, and the address doesn't have both
 439                 # leading and trailing angle brackets, the address
 440                 # is invalid. ie:
 441                 #   "joe smith joe@smith.com" bad
 442                 #   "joe smith <joe@smith.com" bad
 443                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
 444                         $name = "";
 445                         $address = "";
 446                         $comment = "";
 447                 }
 448         }
 449
 450         $name =~ s/^\s+|\s+$//g;
 451         $name =~ s/^\"|\"$//g;
 452         $address =~ s/^\s+|\s+$//g;
 453         $address =~ s/^\<|\>$//g;
 454
 455         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 456                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 457                 $name = "\"$name\"";
 458         }
 459
 460         return ($name, $address, $comment);
 461 }
 462
 463 sub format_email {
 464         my ($name, $address) = @_;
 465
 466         my $formatted_email;
 467
 468         $name =~ s/^\s+|\s+$//g;
 469         $name =~ s/^\"|\"$//g;
 470         $address =~ s/^\s+|\s+$//g;
 471
 472         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 473                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 474                 $name = "\"$name\"";
 475         }
 476
 477         if ("$name" eq "") {
 478                 $formatted_email = "$address";
 479         } else {
 480                 $formatted_email = "$name <$address>";
 481         }
 482
 483         return $formatted_email;
 484 }
 485
 486 sub which_conf {
 487         my ($conf) = @_;
 488
 489         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 490                 if (-e "$path/$conf") {
 491                         return "$path/$conf";
 492                 }
 493         }
 494
 495         return "";
 496 }
 497
 498 sub expand_tabs {
 499         my ($str) = @_;
 500
 501         my $res = '';
 502         my $n = 0;
 503         for my $c (split(//, $str)) {
 504                 if ($c eq "\t") {
 505                         $res .= ' ';
 506                         $n++;
 507                         for (; ($n % 8) != 0; $n++) {
 508                                 $res .= ' ';
 509                         }
 510                         next;
 511                 }
 512                 $res .= $c;
 513                 $n++;
 514         }
 515
 516         return $res;
 517 }
 518 sub copy_spacing {
 519         (my $res = shift) =~ tr/\t/ /c;
 520         return $res;
 521 }
 522
 523 sub line_stats {
 524         my ($line) = @_;
 525
 526         # Drop the diff line leader and expand tabs
 527         $line =~ s/^.//;
 528         $line = expand_tabs($line);
 529
 530         # Pick the indent from the front of the line.
 531         my ($white) = ($line =~ /^(\s*)/);
 532
 533         return (length($line), length($white));
 534 }
 535
 536 my $sanitise_quote = '';
 537
 538 sub sanitise_line_reset {
 539         my ($in_comment) = @_;
 540
 541         if ($in_comment) {
 542                 $sanitise_quote = '*/';
 543         } else {
 544                 $sanitise_quote = '';
 545         }
 546 }
 547 sub sanitise_line {
 548         my ($line) = @_;
 549
 550         my $res = '';
 551         my $l = '';
 552
 553         my $qlen = 0;
 554         my $off = 0;
 555         my $c;
 556
 557         # Always copy over the diff marker.
 558         $res = substr($line, 0, 1);
 559
 560         for ($off = 1; $off < length($line); $off++) {
 561                 $c = substr($line, $off, 1);
 562
 563                 # Comments we are wacking completly including the begin
 564                 # and end, all to $;.
 565                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 566                         $sanitise_quote = '*/';
 567
 568                         substr($res, $off, 2, "$;$;");
 569                         $off++;
 570                         next;
 571                 }
 572                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 573                         $sanitise_quote = '';
 574                         substr($res, $off, 2, "$;$;");
 575                         $off++;
 576                         next;
 577                 }
 578                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 579                         $sanitise_quote = '//';
 580
 581                         substr($res, $off, 2, $sanitise_quote);
 582                         $off++;
 583                         next;
 584                 }
 585
 586                 # A \ in a string means ignore the next character.
 587                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 588                     $c eq "\\") {
 589                         substr($res, $off, 2, 'XX');
 590                         $off++;
 591                         next;
 592                 }
 593                 # Regular quotes.
 594                 if ($c eq "'" || $c eq '"') {
 595                         if ($sanitise_quote eq '') {
 596                                 $sanitise_quote = $c;
 597
 598                                 substr($res, $off, 1, $c);
 599                                 next;
 600                         } elsif ($sanitise_quote eq $c) {
 601                                 $sanitise_quote = '';
 602                         }
 603                 }
 604
 605                 #print "c<$c> SQ<$sanitise_quote>\n";
 606                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 607                         substr($res, $off, 1, $;);
 608                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 609                         substr($res, $off, 1, $;);
 610                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 611                         substr($res, $off, 1, 'X');
 612                 } else {
 613                         substr($res, $off, 1, $c);
 614                 }
 615         }
 616
 617         if ($sanitise_quote eq '//') {
 618                 $sanitise_quote = '';
 619         }
 620
 621         # The pathname on a #include may be surrounded by '<' and '>'.
 622         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 623                 my $clean = 'X' x length($1);
 624                 $res =~ s@\<.*\>@<$clean>@;
 625
 626         # The whole of a #error is a string.
 627         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 628                 my $clean = 'X' x length($1);
 629                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 630         }
 631
 632         return $res;
 633 }
 634
 635 sub ctx_statement_block {
 636         my ($linenr, $remain, $off) = @_;
 637         my $line = $linenr - 1;
 638         my $blk = '';
 639         my $soff = $off;
 640         my $coff = $off - 1;
 641         my $coff_set = 0;
 642
 643         my $loff = 0;
 644
 645         my $type = '';
 646         my $level = 0;
 647         my @stack = ();
 648         my $p;
 649         my $c;
 650         my $len = 0;
 651
 652         my $remainder;
 653         while (1) {
 654                 @stack = (['', 0]) if ($#stack == -1);
 655
 656                 #warn "CSB: blk<$blk> remain<$remain>\n";
 657                 # If we are about to drop off the end, pull in more
 658                 # context.
 659                 if ($off >= $len) {
 660                         for (; $remain > 0; $line++) {
 661                                 last if (!defined $lines[$line]);
 662                                 next if ($lines[$line] =~ /^-/);
 663                                 $remain--;
 664                                 $loff = $len;
 665                                 $blk .= $lines[$line] . "\n";
 666                                 $len = length($blk);
 667                                 $line++;
 668                                 last;
 669                         }
 670                         # Bail if there is no further context.
 671                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 672                         if ($off >= $len) {
 673                                 last;
 674                         }
 675                 }
 676                 $p = $c;
 677                 $c = substr($blk, $off, 1);
 678                 $remainder = substr($blk, $off);
 679
 680                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 681
 682                 # Handle nested #if/#else.
 683                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 684                         push(@stack, [ $type, $level ]);
 685                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 686                         ($type, $level) = @{$stack[$#stack - 1]};
 687                 } elsif ($remainder =~ /^#\s*endif\b/) {
 688                         ($type, $level) = @{pop(@stack)};
 689                 }
 690
 691                 # Statement ends at the ';' or a close '}' at the
 692                 # outermost level.
 693                 if ($level == 0 && $c eq ';') {
 694                         last;
 695                 }
 696
 697                 # An else is really a conditional as long as its not else if
 698                 if ($level == 0 && $coff_set == 0 &&
 699                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 700                                 $remainder =~ /^(else)(?:\s|{)/ &&
 701                                 $remainder !~ /^else\s+if\b/) {
 702                         $coff = $off + length($1) - 1;
 703                         $coff_set = 1;
 704                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 705                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 706                 }
 707
 708                 if (($type eq '' || $type eq '(') && $c eq '(') {
 709                         $level++;
 710                         $type = '(';
 711                 }
 712                 if ($type eq '(' && $c eq ')') {
 713                         $level--;
 714                         $type = ($level != 0)? '(' : '';
 715
 716                         if ($level == 0 && $coff < $soff) {
 717                                 $coff = $off;
 718                                 $coff_set = 1;
 719                                 #warn "CSB: mark coff<$coff>\n";
 720                         }
 721                 }
 722                 if (($type eq '' || $type eq '{') && $c eq '{') {
 723                         $level++;
 724                         $type = '{';
 725                 }
 726                 if ($type eq '{' && $c eq '}') {
 727                         $level--;
 728                         $type = ($level != 0)? '{' : '';
 729
 730                         if ($level == 0) {
 731                                 if (substr($blk, $off + 1, 1) eq ';') {
 732                                         $off++;
 733                                 }
 734                                 last;
 735                         }
 736                 }
 737                 $off++;
 738         }
 739         # We are truly at the end, so shuffle to the next line.
 740         if ($off == $len) {
 741                 $loff = $len + 1;
 742                 $line++;
 743                 $remain--;
 744         }
 745
 746         my $statement = substr($blk, $soff, $off - $soff + 1);
 747         my $condition = substr($blk, $soff, $coff - $soff + 1);
 748
 749         #warn "STATEMENT<$statement>\n";
 750         #warn "CONDITION<$condition>\n";
 751
 752         #print "coff<$coff> soff<$off> loff<$loff>\n";
 753
 754         return ($statement, $condition,
 755                         $line, $remain + 1, $off - $loff + 1, $level);
 756 }
 757
 758 sub statement_lines {
 759         my ($stmt) = @_;
 760
 761         # Strip the diff line prefixes and rip blank lines at start and end.
 762         $stmt =~ s/(^|\n)./$1/g;
 763         $stmt =~ s/^\s*//;
 764         $stmt =~ s/\s*$//;
 765
 766         my @stmt_lines = ($stmt =~ /\n/g);
 767
 768         return $#stmt_lines + 2;
 769 }
 770
 771 sub statement_rawlines {
 772         my ($stmt) = @_;
 773
 774         my @stmt_lines = ($stmt =~ /\n/g);
 775
 776         return $#stmt_lines + 2;
 777 }
 778
 779 sub statement_block_size {
 780         my ($stmt) = @_;
 781
 782         $stmt =~ s/(^|\n)./$1/g;
 783         $stmt =~ s/^\s*{//;
 784         $stmt =~ s/}\s*$//;
 785         $stmt =~ s/^\s*//;
 786         $stmt =~ s/\s*$//;
 787
 788         my @stmt_lines = ($stmt =~ /\n/g);
 789         my @stmt_statements = ($stmt =~ /;/g);
 790
 791         my $stmt_lines = $#stmt_lines + 2;
 792         my $stmt_statements = $#stmt_statements + 1;
 793
 794         if ($stmt_lines > $stmt_statements) {
 795                 return $stmt_lines;
 796         } else {
 797                 return $stmt_statements;
 798         }
 799 }
 800
 801 sub ctx_statement_full {
 802         my ($linenr, $remain, $off) = @_;
 803         my ($statement, $condition, $level);
 804
 805         my (@chunks);
 806
 807         # Grab the first conditional/block pair.
 808         ($statement, $condition, $linenr, $remain, $off, $level) =
 809                                 ctx_statement_block($linenr, $remain, $off);
 810         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 811         push(@chunks, [ $condition, $statement ]);
 812         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 813                 return ($level, $linenr, @chunks);
 814         }
 815
 816         # Pull in the following conditional/block pairs and see if they
 817         # could continue the statement.
 818         for (;;) {
 819                 ($statement, $condition, $linenr, $remain, $off, $level) =
 820                                 ctx_statement_block($linenr, $remain, $off);
 821                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 822                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 823                 #print "C: push\n";
 824                 push(@chunks, [ $condition, $statement ]);
 825         }
 826
 827         return ($level, $linenr, @chunks);
 828 }
 829
 830 sub ctx_block_get {
 831         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 832         my $line;
 833         my $start = $linenr - 1;
 834         my $blk = '';
 835         my @o;
 836         my @c;
 837         my @res = ();
 838
 839         my $level = 0;
 840         my @stack = ($level);
 841         for ($line = $start; $remain > 0; $line++) {
 842                 next if ($rawlines[$line] =~ /^-/);
 843                 $remain--;
 844
 845                 $blk .= $rawlines[$line];
 846
 847                 # Handle nested #if/#else.
 848                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 849                         push(@stack, $level);
 850                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 851                         $level = $stack[$#stack - 1];
 852                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 853                         $level = pop(@stack);
 854                 }
 855
 856                 foreach my $c (split(//, $lines[$line])) {
 857                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 858                         if ($off > 0) {
 859                                 $off--;
 860                                 next;
 861                         }
 862
 863                         if ($c eq $close && $level > 0) {
 864                                 $level--;
 865                                 last if ($level == 0);
 866                         } elsif ($c eq $open) {
 867                                 $level++;
 868                         }
 869                 }
 870
 871                 if (!$outer || $level <= 1) {
 872                         push(@res, $rawlines[$line]);
 873                 }
 874
 875                 last if ($level == 0);
 876         }
 877
 878         return ($level, @res);
 879 }
 880 sub ctx_block_outer {
 881         my ($linenr, $remain) = @_;
 882
 883         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 884         return @r;
 885 }
 886 sub ctx_block {
 887         my ($linenr, $remain) = @_;
 888
 889         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 890         return @r;
 891 }
 892 sub ctx_statement {
 893         my ($linenr, $remain, $off) = @_;
 894
 895         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 896         return @r;
 897 }
 898 sub ctx_block_level {
 899         my ($linenr, $remain) = @_;
 900
 901         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 902 }
 903 sub ctx_statement_level {
 904         my ($linenr, $remain, $off) = @_;
 905
 906         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 907 }
 908
 909 sub ctx_locate_comment {
 910         my ($first_line, $end_line) = @_;
 911
 912         # Catch a comment on the end of the line itself.
 913         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 914         return $current_comment if (defined $current_comment);
 915
 916         # Look through the context and try and figure out if there is a
 917         # comment.
 918         my $in_comment = 0;
 919         $current_comment = '';
 920         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 921                 my $line = $rawlines[$linenr - 1];
 922                 #warn "           $line\n";
 923                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 924                         $in_comment = 1;
 925                 }
 926                 if ($line =~ m@/\*@) {
 927                         $in_comment = 1;
 928                 }
 929                 if (!$in_comment && $current_comment ne '') {
 930                         $current_comment = '';
 931                 }
 932                 $current_comment .= $line . "\n" if ($in_comment);
 933                 if ($line =~ m@\*/@) {
 934                         $in_comment = 0;
 935                 }
 936         }
 937
 938         chomp($current_comment);
 939         return($current_comment);
 940 }
 941 sub ctx_has_comment {
 942         my ($first_line, $end_line) = @_;
 943         my $cmt = ctx_locate_comment($first_line, $end_line);
 944
 945         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 946         ##print "CMMT: $cmt\n";
 947
 948         return ($cmt ne '');
 949 }
 950
 951 sub raw_line {
 952         my ($linenr, $cnt) = @_;
 953
 954         my $offset = $linenr - 1;
 955         $cnt++;
 956
 957         my $line;
 958         while ($cnt) {
 959                 $line = $rawlines[$offset++];
 960                 next if (defined($line) && $line =~ /^-/);
 961                 $cnt--;
 962         }
 963
 964         return $line;
 965 }
 966
 967 sub cat_vet {
 968         my ($vet) = @_;
 969         my ($res, $coded);
 970
 971         $res = '';
 972         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 973                 $res .= $1;
 974                 if ($2 ne '') {
 975                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 976                         $res .= $coded;
 977                 }
 978         }
 979         $res =~ s/$/\$/;
 980
 981         return $res;
 982 }
 983
 984 my $av_preprocessor = 0;
 985 my $av_pending;
 986 my @av_paren_type;
 987 my $av_pend_colon;
 988
 989 sub annotate_reset {
 990         $av_preprocessor = 0;
 991         $av_pending = '_';
 992         @av_paren_type = ('E');
 993         $av_pend_colon = 'O';
 994 }
 995
 996 sub annotate_values {
 997         my ($stream, $type) = @_;
 998
 999         my $res;
1000         my $var = '_' x length($stream);
1001         my $cur = $stream;
1002
1003         print "$stream\n" if ($dbg_values > 1);
1004
1005         while (length($cur)) {
1006                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1007                 print " <" . join('', @av_paren_type) .
1008                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1009                 if ($cur =~ /^(\s+)/o) {
1010                         print "WS($1)\n" if ($dbg_values > 1);
1011                         if ($1 =~ /\n/ && $av_preprocessor) {
1012                                 $type = pop(@av_paren_type);
1013                                 $av_preprocessor = 0;
1014                         }
1015
1016                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1017                         print "CAST($1)\n" if ($dbg_values > 1);
1018                         push(@av_paren_type, $type);
1019                         $type = 'C';
1020
1021                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1022                         print "DECLARE($1)\n" if ($dbg_values > 1);
1023                         $type = 'T';
1024
1025                 } elsif ($cur =~ /^($Modifier)\s*/) {
1026                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1027                         $type = 'T';
1028
1029                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1030                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1031                         $av_preprocessor = 1;
1032                         push(@av_paren_type, $type);
1033                         if ($2 ne '') {
1034                                 $av_pending = 'N';
1035                         }
1036                         $type = 'E';
1037
1038                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1039                         print "UNDEF($1)\n" if ($dbg_values > 1);
1040                         $av_preprocessor = 1;
1041                         push(@av_paren_type, $type);
1042
1043                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1044                         print "PRE_START($1)\n" if ($dbg_values > 1);
1045                         $av_preprocessor = 1;
1046
1047                         push(@av_paren_type, $type);
1048                         push(@av_paren_type, $type);
1049                         $type = 'E';
1050
1051                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1052                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1053                         $av_preprocessor = 1;
1054
1055                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1056
1057                         $type = 'E';
1058
1059                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1060                         print "PRE_END($1)\n" if ($dbg_values > 1);
1061
1062                         $av_preprocessor = 1;
1063
1064                         # Assume all arms of the conditional end as this
1065                         # one does, and continue as if the #endif was not here.
1066                         pop(@av_paren_type);
1067                         push(@av_paren_type, $type);
1068                         $type = 'E';
1069
1070                 } elsif ($cur =~ /^(\\\n)/o) {
1071                         print "PRECONT($1)\n" if ($dbg_values > 1);
1072
1073                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1074                         print "ATTR($1)\n" if ($dbg_values > 1);
1075                         $av_pending = $type;
1076                         $type = 'N';
1077
1078                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1079                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1080                         if (defined $2) {
1081                                 $av_pending = 'V';
1082                         }
1083                         $type = 'N';
1084
1085                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1086                         print "COND($1)\n" if ($dbg_values > 1);
1087                         $av_pending = 'E';
1088                         $type = 'N';
1089
1090                 } elsif ($cur =~/^(case)/o) {
1091                         print "CASE($1)\n" if ($dbg_values > 1);
1092                         $av_pend_colon = 'C';
1093                         $type = 'N';
1094
1095                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1096                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1097                         $type = 'N';
1098
1099                 } elsif ($cur =~ /^(\()/o) {
1100                         print "PAREN('$1')\n" if ($dbg_values > 1);
1101                         push(@av_paren_type, $av_pending);
1102                         $av_pending = '_';
1103                         $type = 'N';
1104
1105                 } elsif ($cur =~ /^(\))/o) {
1106                         my $new_type = pop(@av_paren_type);
1107                         if ($new_type ne '_') {
1108                                 $type = $new_type;
1109                                 print "PAREN('$1') -> $type\n"
1110                                                         if ($dbg_values > 1);
1111                         } else {
1112                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1113                         }
1114
1115                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1116                         print "FUNC($1)\n" if ($dbg_values > 1);
1117                         $type = 'V';
1118                         $av_pending = 'V';
1119
1120                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1121                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1122                                 $av_pend_colon = 'B';
1123                         } elsif ($type eq 'E') {
1124                                 $av_pend_colon = 'L';
1125                         }
1126                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1127                         $type = 'V';
1128
1129                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1130                         print "IDENT($1)\n" if ($dbg_values > 1);
1131                         $type = 'V';
1132
1133                 } elsif ($cur =~ /^($Assignment)/o) {
1134                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1135                         $type = 'N';
1136
1137                 } elsif ($cur =~/^(;|{|})/) {
1138                         print "END($1)\n" if ($dbg_values > 1);
1139                         $type = 'E';
1140                         $av_pend_colon = 'O';
1141
1142                 } elsif ($cur =~/^(,)/) {
1143                         print "COMMA($1)\n" if ($dbg_values > 1);
1144                         $type = 'C';
1145
1146                 } elsif ($cur =~ /^(\?)/o) {
1147                         print "QUESTION($1)\n" if ($dbg_values > 1);
1148                         $type = 'N';
1149
1150                 } elsif ($cur =~ /^(:)/o) {
1151                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1152
1153                         substr($var, length($res), 1, $av_pend_colon);
1154                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1155                                 $type = 'E';
1156                         } else {
1157                                 $type = 'N';
1158                         }
1159                         $av_pend_colon = 'O';
1160
1161                 } elsif ($cur =~ /^(\[)/o) {
1162                         print "CLOSE($1)\n" if ($dbg_values > 1);
1163                         $type = 'N';
1164
1165                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1166                         my $variant;
1167
1168                         print "OPV($1)\n" if ($dbg_values > 1);
1169                         if ($type eq 'V') {
1170                                 $variant = 'B';
1171                         } else {
1172                                 $variant = 'U';
1173                         }
1174
1175                         substr($var, length($res), 1, $variant);
1176                         $type = 'N';
1177
1178                 } elsif ($cur =~ /^($Operators)/o) {
1179                         print "OP($1)\n" if ($dbg_values > 1);
1180                         if ($1 ne '++' && $1 ne '--') {
1181                                 $type = 'N';
1182                         }
1183
1184                 } elsif ($cur =~ /(^.)/o) {
1185                         print "C($1)\n" if ($dbg_values > 1);
1186                 }
1187                 if (defined $1) {
1188                         $cur = substr($cur, length($1));
1189                         $res .= $type x length($1);
1190                 }
1191         }
1192
1193         return ($res, $var);
1194 }
1195
1196 sub possible {
1197         my ($possible, $line) = @_;
1198         my $notPermitted = qr{(?:
1199                 ^(?:
1200                         $Modifier|
1201                         $Storage|
1202                         $Type|
1203                         DEFINE_\S+
1204                 )$|
1205                 ^(?:
1206                         goto|
1207                         return|
1208                         case|
1209                         else|
1210                         asm|__asm__|
1211                         do
1212                 )(?:\s|$)|
1213                 ^(?:typedef|struct|enum)\b
1214             )}x;
1215         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1216         if ($possible !~ $notPermitted) {
1217                 # Check for modifiers.
1218                 $possible =~ s/\s*$Storage\s*//g;
1219                 $possible =~ s/\s*$Sparse\s*//g;
1220                 if ($possible =~ /^\s*$/) {
1221
1222                 } elsif ($possible =~ /\s/) {
1223                         $possible =~ s/\s*$Type\s*//g;
1224                         for my $modifier (split(' ', $possible)) {
1225                                 if ($modifier !~ $notPermitted) {
1226                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1227                                         push(@modifierList, $modifier);
1228                                 }
1229                         }
1230
1231                 } else {
1232                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1233                         push(@typeList, $possible);
1234                 }
1235                 build_types();
1236         } else {
1237                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1238         }
1239 }
1240
1241 my $prefix = '';
1242
1243 sub show_type {
1244        return !defined $ignore_type{$_[0]};
1245 }
1246
1247 sub report {
1248         if (!show_type($_[1]) ||
1249             (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) {
1250                 return 0;
1251         }
1252         my $line;
1253         if ($show_types) {
1254                 $line = "$prefix$_[0]:$_[1]: $_[2]\n";
1255         } else {
1256                 $line = "$prefix$_[0]: $_[2]\n";
1257         }
1258         $line = (split('\n', $line))[0] . "\n" if ($terse);
1259
1260         push(our @report, $line);
1261
1262         return 1;
1263 }
1264 sub report_dump {
1265         our @report;
1266 }
1267
1268 sub ERROR {
1269         if (report("ERROR", $_[0], $_[1])) {
1270                 our $clean = 0;
1271                 our $cnt_error++;
1272         }
1273 }
1274 sub WARN {
1275         if (report("WARNING", $_[0], $_[1])) {
1276                 our $clean = 0;
1277                 our $cnt_warn++;
1278         }
1279 }
1280 sub CHK {
1281         if ($check && report("CHECK", $_[0], $_[1])) {
1282                 our $clean = 0;
1283                 our $cnt_chk++;
1284         }
1285 }
1286
1287 sub check_absolute_file {
1288         my ($absolute, $herecurr) = @_;
1289         my $file = $absolute;
1290
1291         ##print "absolute<$absolute>\n";
1292
1293         # See if any suffix of this path is a path within the tree.
1294         while ($file =~ s@^[^/]*/@@) {
1295                 if (-f "$root/$file") {
1296                         ##print "file<$file>\n";
1297                         last;
1298                 }
1299         }
1300         if (! -f _)  {
1301                 return 0;
1302         }
1303
1304         # It is, so see if the prefix is acceptable.
1305         my $prefix = $absolute;
1306         substr($prefix, -length($file)) = '';
1307
1308         ##print "prefix<$prefix>\n";
1309         if ($prefix ne ".../") {
1310                 WARN("USE_RELATIVE_PATH",
1311                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1312         }
1313 }
1314
1315 sub process {
1316         my $filename = shift;
1317
1318         my $linenr=0;
1319         my $prevline="";
1320         my $prevrawline="";
1321         my $stashline="";
1322         my $stashrawline="";
1323
1324         my $length;
1325         my $indent;
1326         my $previndent=0;
1327         my $stashindent=0;
1328
1329         our $clean = 1;
1330         my $signoff = 0;
1331         my $is_patch = 0;
1332
1333         our @report = ();
1334         our $cnt_lines = 0;
1335         our $cnt_error = 0;
1336         our $cnt_warn = 0;
1337         our $cnt_chk = 0;
1338
1339         # Trace the real file/line as we go.
1340         my $realfile = '';
1341         my $realline = 0;
1342         my $realcnt = 0;
1343         my $here = '';
1344         my $in_comment = 0;
1345         my $comment_edge = 0;
1346         my $first_line = 0;
1347         my $p1_prefix = '';
1348
1349         my $prev_values = 'E';
1350
1351         # suppression flags
1352         my %suppress_ifbraces;
1353         my %suppress_whiletrailers;
1354         my %suppress_export;
1355
1356         # Pre-scan the patch sanitizing the lines.
1357         # Pre-scan the patch looking for any __setup documentation.
1358         #
1359         my @setup_docs = ();
1360         my $setup_docs = 0;
1361
1362         sanitise_line_reset();
1363         my $line;
1364         foreach my $rawline (@rawlines) {
1365                 $linenr++;
1366                 $line = $rawline;
1367
1368                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1369                         $setup_docs = 0;
1370                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1371                                 $setup_docs = 1;
1372                         }
1373                         #next;
1374                 }
1375                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1376                         $realline=$1-1;
1377                         if (defined $2) {
1378                                 $realcnt=$3+1;
1379                         } else {
1380                                 $realcnt=1+1;
1381                         }
1382                         $in_comment = 0;
1383
1384                         # Guestimate if this is a continuing comment.  Run
1385                         # the context looking for a comment "edge".  If this
1386                         # edge is a close comment then we must be in a comment
1387                         # at context start.
1388                         my $edge;
1389                         my $cnt = $realcnt;
1390                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1391                                 next if (defined $rawlines[$ln - 1] &&
1392                                          $rawlines[$ln - 1] =~ /^-/);
1393                                 $cnt--;
1394                                 #print "RAW<$rawlines[$ln - 1]>\n";
1395                                 last if (!defined $rawlines[$ln - 1]);
1396                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1397                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1398                                         ($edge) = $1;
1399                                         last;
1400                                 }
1401                         }
1402                         if (defined $edge && $edge eq '*/') {
1403                                 $in_comment = 1;
1404                         }
1405
1406                         # Guestimate if this is a continuing comment.  If this
1407                         # is the start of a diff block and this line starts
1408                         # ' *' then it is very likely a comment.
1409                         if (!defined $edge &&
1410                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1411                         {
1412                                 $in_comment = 1;
1413                         }
1414
1415                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1416                         sanitise_line_reset($in_comment);
1417
1418                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1419                         # Standardise the strings and chars within the input to
1420                         # simplify matching -- only bother with positive lines.
1421                         $line = sanitise_line($rawline);
1422                 }
1423                 push(@lines, $line);
1424
1425                 if ($realcnt > 1) {
1426                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1427                 } else {
1428                         $realcnt = 0;
1429                 }
1430
1431                 #print "==>$rawline\n";
1432                 #print "-->$line\n";
1433
1434                 if ($setup_docs && $line =~ /^\+/) {
1435                         push(@setup_docs, $line);
1436                 }
1437         }
1438
1439         $prefix = '';
1440
1441         $realcnt = 0;
1442         $linenr = 0;
1443         foreach my $line (@lines) {
1444                 $linenr++;
1445
1446                 my $rawline = $rawlines[$linenr - 1];
1447
1448 #extract the line range in the file after the patch is applied
1449                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1450                         $is_patch = 1;
1451                         $first_line = $linenr + 1;
1452                         $realline=$1-1;
1453                         if (defined $2) {
1454                                 $realcnt=$3+1;
1455                         } else {
1456                                 $realcnt=1+1;
1457                         }
1458                         annotate_reset();
1459                         $prev_values = 'E';
1460
1461                         %suppress_ifbraces = ();
1462                         %suppress_whiletrailers = ();
1463                         %suppress_export = ();
1464                         next;
1465
1466 # track the line number as we move through the hunk, note that
1467 # new versions of GNU diff omit the leading space on completely
1468 # blank context lines so we need to count that too.
1469                 } elsif ($line =~ /^( |\+|$)/) {
1470                         $realline++;
1471                         $realcnt-- if ($realcnt != 0);
1472
1473                         # Measure the line length and indent.
1474                         ($length, $indent) = line_stats($rawline);
1475
1476                         # Track the previous line.
1477                         ($prevline, $stashline) = ($stashline, $line);
1478                         ($previndent, $stashindent) = ($stashindent, $indent);
1479                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1480
1481                         #warn "line<$line>\n";
1482
1483                 } elsif ($realcnt == 1) {
1484                         $realcnt--;
1485                 }
1486
1487                 my $hunk_line = ($realcnt != 0);
1488
1489 #make up the handle for any error we report on this line
1490                 $prefix = "$filename:$realline: " if ($emacs && $file);
1491                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1492
1493                 $here = "#$linenr: " if (!$file);
1494                 $here = "#$realline: " if ($file);
1495
1496                 # extract the filename as it passes
1497                 if ($line =~ /^diff --git.*?(\S+)$/) {
1498                         $realfile = $1;
1499                         $realfile =~ s@^([^/]*)/@@;
1500
1501                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1502                         $realfile = $1;
1503                         $realfile =~ s@^([^/]*)/@@;
1504
1505                         $p1_prefix = $1;
1506                         if (!$file && $tree && $p1_prefix ne '' &&
1507                             -e "$root/$p1_prefix") {
1508                                 WARN("PATCH_PREFIX",
1509                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1510                         }
1511
1512                         if ($realfile =~ m@^include/asm/@) {
1513                                 ERROR("MODIFIED_INCLUDE_ASM",
1514                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1515                         }
1516                         next;
1517                 }
1518
1519                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1520
1521                 my $hereline = "$here\n$rawline\n";
1522                 my $herecurr = "$here\n$rawline\n";
1523                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1524
1525                 $cnt_lines++ if ($realcnt != 0);
1526
1527 # Check for incorrect file permissions
1528                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1529                         my $permhere = $here . "FILE: $realfile\n";
1530                         if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1531                                 ERROR("EXECUTE_PERMISSIONS",
1532                                       "do not set execute permissions for source files\n" . $permhere);
1533                         }
1534                 }
1535
1536 # Check the patch for a signoff:
1537                 if ($line =~ /^\s*signed-off-by:/i) {
1538                         $signoff++;
1539                 }
1540
1541 # Check signature styles
1542                 if ($line =~ /^(\s*)($signature_tags)(\s*)(.*)/) {
1543                         my $space_before = $1;
1544                         my $sign_off = $2;
1545                         my $space_after = $3;
1546                         my $email = $4;
1547                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
1548
1549                         if (defined $space_before && $space_before ne "") {
1550                                 WARN("BAD_SIGN_OFF",
1551                                      "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
1552                         }
1553                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
1554                                 WARN("BAD_SIGN_OFF",
1555                                      "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr);
1556                         }
1557                         if (!defined $space_after || $space_after ne " ") {
1558                                 WARN("BAD_SIGN_OFF",
1559                                      "Use a single space after $ucfirst_sign_off\n" . $herecurr);
1560                         }
1561
1562                         my ($email_name, $email_address, $comment) = parse_email($email);
1563                         my $suggested_email = format_email(($email_name, $email_address));
1564                         if ($suggested_email eq "") {
1565                                 ERROR("BAD_SIGN_OFF",
1566                                       "Unrecognized email address: '$email'\n" . $herecurr);
1567                         } else {
1568                                 my $dequoted = $suggested_email;
1569                                 $dequoted =~ s/^"//;
1570                                 $dequoted =~ s/" </ </;
1571                                 # Don't force email to have quotes
1572                                 # Allow just an angle bracketed address
1573                                 if ("$dequoted$comment" ne $email &&
1574                                     "<$email_address>$comment" ne $email &&
1575                                     "$suggested_email$comment" ne $email) {
1576                                         WARN("BAD_SIGN_OFF",
1577                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
1578                                 }
1579                         }
1580                 }
1581
1582 # Check for wrappage within a valid hunk of the file
1583                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1584                         ERROR("CORRUPTED_PATCH",
1585                               "patch seems to be corrupt (line wrapped?)\n" .
1586                                 $herecurr) if (!$emitted_corrupt++);
1587                 }
1588
1589 # Check for absolute kernel paths.
1590                 if ($tree) {
1591                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1592                                 my $file = $1;
1593
1594                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1595                                     check_absolute_file($1, $herecurr)) {
1596                                         #
1597                                 } else {
1598                                         check_absolute_file($file, $herecurr);
1599                                 }
1600                         }
1601                 }
1602
1603 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1604                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1605                     $rawline !~ m/^$UTF8*$/) {
1606                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1607
1608                         my $blank = copy_spacing($rawline);
1609                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1610                         my $hereptr = "$hereline$ptr\n";
1611
1612                         CHK("INVALID_UTF8",
1613                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1614                 }
1615
1616 # ignore non-hunk lines and lines being removed
1617                 next if (!$hunk_line || $line =~ /^-/);
1618
1619 #trailing whitespace
1620                 if ($line =~ /^\+.*\015/) {
1621                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1622                         ERROR("DOS_LINE_ENDINGS",
1623                               "DOS line endings\n" . $herevet);
1624
1625                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1626                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1627                         ERROR("TRAILING_WHITESPACE",
1628                               "trailing whitespace\n" . $herevet);
1629                         $rpt_cleaners = 1;
1630                 }
1631
1632 # check for Kconfig help text having a real description
1633 # Only applies when adding the entry originally, after that we do not have
1634 # sufficient context to determine whether it is indeed long enough.
1635                 if ($realfile =~ /Kconfig/ &&
1636                     $line =~ /\+\s*(?:---)?help(?:---)?$/) {
1637                         my $length = 0;
1638                         my $cnt = $realcnt;
1639                         my $ln = $linenr + 1;
1640                         my $f;
1641                         my $is_end = 0;
1642                         while ($cnt > 0 && defined $lines[$ln - 1]) {
1643                                 $f = $lines[$ln - 1];
1644                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1645                                 $is_end = $lines[$ln - 1] =~ /^\+/;
1646                                 $ln++;
1647
1648                                 next if ($f =~ /^-/);
1649                                 $f =~ s/^.//;
1650                                 $f =~ s/#.*//;
1651                                 $f =~ s/^\s+//;
1652                                 next if ($f =~ /^$/);
1653                                 if ($f =~ /^\s*config\s/) {
1654                                         $is_end = 1;
1655                                         last;
1656                                 }
1657                                 $length++;
1658                         }
1659                         WARN("CONFIG_DESCRIPTION",
1660                              "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_end && $length < 4);
1661                         #print "is_end<$is_end> length<$length>\n";
1662                 }
1663
1664 # check we are in a valid source file if not then ignore this hunk
1665                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1666
1667 #80 column limit
1668                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1669                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1670                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
1671                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1672                     $length > 80)
1673                 {
1674                         WARN("LONG_LINE",
1675                              "line over 80 characters\n" . $herecurr);
1676                 }
1677
1678 # check for spaces before a quoted newline
1679                 if ($rawline =~ /^.*\".*\s\\n/) {
1680                         WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
1681                              "unnecessary whitespace before a quoted newline\n" . $herecurr);
1682                 }
1683
1684 # check for adding lines without a newline.
1685                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1686                         WARN("MISSING_EOF_NEWLINE",
1687                              "adding a line without newline at end of file\n" . $herecurr);
1688                 }
1689
1690 # Blackfin: use hi/lo macros
1691                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1692                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1693                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1694                                 ERROR("LO_MACRO",
1695                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1696                         }
1697                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1698                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1699                                 ERROR("HI_MACRO",
1700                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
1701                         }
1702                 }
1703
1704 # check we are in a valid source file C or perl if not then ignore this hunk
1705                 next if ($realfile !~ /\.(h|c|pl)$/);
1706
1707 # at the beginning of a line any tabs must come first and anything
1708 # more than 8 must use tabs.
1709                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
1710                     $rawline =~ /^\+\s*        \s*/) {
1711                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1712                         ERROR("CODE_INDENT",
1713                               "code indent should use tabs where possible\n" . $herevet);
1714                         $rpt_cleaners = 1;
1715                 }
1716
1717 # check for space before tabs.
1718                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1719                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1720                         WARN("SPACE_BEFORE_TAB",
1721                              "please, no space before tabs\n" . $herevet);
1722                 }
1723
1724 # check for spaces at the beginning of a line.
1725 # Exceptions:
1726 #  1) within comments
1727 #  2) indented preprocessor commands
1728 #  3) hanging labels
1729                 if ($rawline =~ /^\+ / && $line !~ /\+ *(?:$;|#|$Ident:)/)  {
1730                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1731                         WARN("LEADING_SPACE",
1732                              "please, no spaces at the start of a line\n" . $herevet);
1733                 }
1734
1735 # check we are in a valid C source file if not then ignore this hunk
1736                 next if ($realfile !~ /\.(h|c)$/);
1737
1738 # check for RCS/CVS revision markers
1739                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1740                         WARN("CVS_KEYWORD",
1741                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1742                 }
1743
1744 # Blackfin: don't use __builtin_bfin_[cs]sync
1745                 if ($line =~ /__builtin_bfin_csync/) {
1746                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1747                         ERROR("CSYNC",
1748                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1749                 }
1750                 if ($line =~ /__builtin_bfin_ssync/) {
1751                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1752                         ERROR("SSYNC",
1753                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1754                 }
1755
1756 # Check for potential 'bare' types
1757                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1758                     $realline_next);
1759                 if ($realcnt && $line =~ /.\s*\S/) {
1760                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1761                                 ctx_statement_block($linenr, $realcnt, 0);
1762                         $stat =~ s/\n./\n /g;
1763                         $cond =~ s/\n./\n /g;
1764
1765                         # Find the real next line.
1766                         $realline_next = $line_nr_next;
1767                         if (defined $realline_next &&
1768                             (!defined $lines[$realline_next - 1] ||
1769                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1770                                 $realline_next++;
1771                         }
1772
1773                         my $s = $stat;
1774                         $s =~ s/{.*$//s;
1775
1776                         # Ignore goto labels.
1777                         if ($s =~ /$Ident:\*$/s) {
1778
1779                         # Ignore functions being called
1780                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1781
1782                         } elsif ($s =~ /^.\s*else\b/s) {
1783
1784                         # declarations always start with types
1785                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1786                                 my $type = $1;
1787                                 $type =~ s/\s+/ /g;
1788                                 possible($type, "A:" . $s);
1789
1790                         # definitions in global scope can only start with types
1791                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1792                                 possible($1, "B:" . $s);
1793                         }
1794
1795                         # any (foo ... *) is a pointer cast, and foo is a type
1796                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1797                                 possible($1, "C:" . $s);
1798                         }
1799
1800                         # Check for any sort of function declaration.
1801                         # int foo(something bar, other baz);
1802                         # void (*store_gdt)(x86_descr_ptr *);
1803                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1804                                 my ($name_len) = length($1);
1805
1806                                 my $ctx = $s;
1807                                 substr($ctx, 0, $name_len + 1, '');
1808                                 $ctx =~ s/\)[^\)]*$//;
1809
1810                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1811                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1812
1813                                                 possible($1, "D:" . $s);
1814                                         }
1815                                 }
1816                         }
1817
1818                 }
1819
1820 #
1821 # Checks which may be anchored in the context.
1822 #
1823
1824 # Check for switch () and associated case and default
1825 # statements should be at the same indent.
1826                 if ($line=~/\bswitch\s*\(.*\)/) {
1827                         my $err = '';
1828                         my $sep = '';
1829                         my @ctx = ctx_block_outer($linenr, $realcnt);
1830                         shift(@ctx);
1831                         for my $ctx (@ctx) {
1832                                 my ($clen, $cindent) = line_stats($ctx);
1833                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1834                                                         $indent != $cindent) {
1835                                         $err .= "$sep$ctx\n";
1836                                         $sep = '';
1837                                 } else {
1838                                         $sep = "[...]\n";
1839                                 }
1840                         }
1841                         if ($err ne '') {
1842                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
1843                                       "switch and case should be at the same indent\n$hereline$err");
1844                         }
1845                 }
1846
1847 # if/while/etc brace do not go on next line, unless defining a do while loop,
1848 # or if that brace on the next line is for something else
1849                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1850                         my $pre_ctx = "$1$2";
1851
1852                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1853                         my $ctx_cnt = $realcnt - $#ctx - 1;
1854                         my $ctx = join("\n", @ctx);
1855
1856                         my $ctx_ln = $linenr;
1857                         my $ctx_skip = $realcnt;
1858
1859                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1860                                         defined $lines[$ctx_ln - 1] &&
1861                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1862                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1863                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1864                                 $ctx_ln++;
1865                         }
1866
1867                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1868                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1869
1870                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
1871                                 ERROR("OPEN_BRACE",
1872                                       "that open brace { should be on the previous line\n" .
1873                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1874                         }
1875                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1876                             $ctx =~ /\)\s*\;\s*$/ &&
1877                             defined $lines[$ctx_ln - 1])
1878                         {
1879                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1880                                 if ($nindent > $indent) {
1881                                         WARN("TRAILING_SEMICOLON",
1882                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
1883                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1884                                 }
1885                         }
1886                 }
1887
1888 # Check relative indent for conditionals and blocks.
1889                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1890                         my ($s, $c) = ($stat, $cond);
1891
1892                         substr($s, 0, length($c), '');
1893
1894                         # Make sure we remove the line prefixes as we have
1895                         # none on the first line, and are going to readd them
1896                         # where necessary.
1897                         $s =~ s/\n./\n/gs;
1898
1899                         # Find out how long the conditional actually is.
1900                         my @newlines = ($c =~ /\n/gs);
1901                         my $cond_lines = 1 + $#newlines;
1902
1903                         # We want to check the first line inside the block
1904                         # starting at the end of the conditional, so remove:
1905                         #  1) any blank line termination
1906                         #  2) any opening brace { on end of the line
1907                         #  3) any do (...) {
1908                         my $continuation = 0;
1909                         my $check = 0;
1910                         $s =~ s/^.*\bdo\b//;
1911                         $s =~ s/^\s*{//;
1912                         if ($s =~ s/^\s*\\//) {
1913                                 $continuation = 1;
1914                         }
1915                         if ($s =~ s/^\s*?\n//) {
1916                                 $check = 1;
1917                                 $cond_lines++;
1918                         }
1919
1920                         # Also ignore a loop construct at the end of a
1921                         # preprocessor statement.
1922                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1923                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1924                                 $check = 0;
1925                         }
1926
1927                         my $cond_ptr = -1;
1928                         $continuation = 0;
1929                         while ($cond_ptr != $cond_lines) {
1930                                 $cond_ptr = $cond_lines;
1931
1932                                 # If we see an #else/#elif then the code
1933                                 # is not linear.
1934                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1935                                         $check = 0;
1936                                 }
1937
1938                                 # Ignore:
1939                                 #  1) blank lines, they should be at 0,
1940                                 #  2) preprocessor lines, and
1941                                 #  3) labels.
1942                                 if ($continuation ||
1943                                     $s =~ /^\s*?\n/ ||
1944                                     $s =~ /^\s*#\s*?/ ||
1945                                     $s =~ /^\s*$Ident\s*:/) {
1946                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1947                                         if ($s =~ s/^.*?\n//) {
1948                                                 $cond_lines++;
1949                                         }
1950                                 }
1951                         }
1952
1953                         my (undef, $sindent) = line_stats("+" . $s);
1954                         my $stat_real = raw_line($linenr, $cond_lines);
1955
1956                         # Check if either of these lines are modified, else
1957                         # this is not this patch's fault.
1958                         if (!defined($stat_real) ||
1959                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1960                                 $check = 0;
1961                         }
1962                         if (defined($stat_real) && $cond_lines > 1) {
1963                                 $stat_real = "[...]\n$stat_real";
1964                         }
1965
1966                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
1967
1968                         if ($check && (($sindent % 8) != 0 ||
1969                             ($sindent <= $indent && $s ne ''))) {
1970                                 WARN("SUSPECT_CODE_INDENT",
1971                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1972                         }
1973                 }
1974
1975                 # Track the 'values' across context and added lines.
1976                 my $opline = $line; $opline =~ s/^./ /;
1977                 my ($curr_values, $curr_vars) =
1978                                 annotate_values($opline . "\n", $prev_values);
1979                 $curr_values = $prev_values . $curr_values;
1980                 if ($dbg_values) {
1981                         my $outline = $opline; $outline =~ s/\t/ /g;
1982                         print "$linenr > .$outline\n";
1983                         print "$linenr > $curr_values\n";
1984                         print "$linenr >  $curr_vars\n";
1985                 }
1986                 $prev_values = substr($curr_values, -1);
1987
1988 #ignore lines not being added
1989                 if ($line=~/^[^\+]/) {next;}
1990
1991 # TEST: allow direct testing of the type matcher.
1992                 if ($dbg_type) {
1993                         if ($line =~ /^.\s*$Declare\s*$/) {
1994                                 ERROR("TEST_TYPE",
1995                                       "TEST: is type\n" . $herecurr);
1996                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1997                                 ERROR("TEST_NOT_TYPE",
1998                                       "TEST: is not type ($1 is)\n". $herecurr);
1999                         }
2000                         next;
2001                 }
2002 # TEST: allow direct testing of the attribute matcher.
2003                 if ($dbg_attr) {
2004                         if ($line =~ /^.\s*$Modifier\s*$/) {
2005                                 ERROR("TEST_ATTR",
2006                                       "TEST: is attr\n" . $herecurr);
2007                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2008                                 ERROR("TEST_NOT_ATTR",
2009                                       "TEST: is not attr ($1 is)\n". $herecurr);
2010                         }
2011                         next;
2012                 }
2013
2014 # check for initialisation to aggregates open brace on the next line
2015                 if ($line =~ /^.\s*{/ &&
2016                     $prevline =~ /(?:^|[^=])=\s*$/) {
2017                         ERROR("OPEN_BRACE",
2018                               "that open brace { should be on the previous line\n" . $hereprev);
2019                 }
2020
2021 #
2022 # Checks which are anchored on the added line.
2023 #
2024
2025 # check for malformed paths in #include statements (uses RAW line)
2026                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
2027                         my $path = $1;
2028                         if ($path =~ m{//}) {
2029                                 ERROR("MALFORMED_INCLUDE",
2030                                       "malformed #include filename\n" .
2031                                         $herecurr);
2032                         }
2033                 }
2034
2035 # no C99 // comments
2036                 if ($line =~ m{//}) {
2037                         ERROR("C99_COMMENTS",
2038                               "do not use C99 // comments\n" . $herecurr);
2039                 }
2040                 # Remove C99 comments.
2041                 $line =~ s@//.*@@;
2042                 $opline =~ s@//.*@@;
2043
2044 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
2045 # the whole statement.
2046 #print "APW <$lines[$realline_next - 1]>\n";
2047                 if (defined $realline_next &&
2048                     exists $lines[$realline_next - 1] &&
2049                     !defined $suppress_export{$realline_next} &&
2050                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2051                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2052                         # Handle definitions which produce identifiers with
2053                         # a prefix:
2054                         #   XXX(foo);
2055                         #   EXPORT_SYMBOL(something_foo);
2056                         my $name = $1;
2057                         if ($stat =~ /^.([A-Z_]+)\s*\(\s*($Ident)/ &&
2058                             $name =~ /^${Ident}_$2/) {
2059 #print "FOO C name<$name>\n";
2060                                 $suppress_export{$realline_next} = 1;
2061
2062                         } elsif ($stat !~ /(?:
2063                                 \n.}\s*$|
2064                                 ^.DEFINE_$Ident\(\Q$name\E\)|
2065                                 ^.DECLARE_$Ident\(\Q$name\E\)|
2066                                 ^.LIST_HEAD\(\Q$name\E\)|
2067                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
2068                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
2069                             )/x) {
2070 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
2071                                 $suppress_export{$realline_next} = 2;
2072                         } else {
2073                                 $suppress_export{$realline_next} = 1;
2074                         }
2075                 }
2076                 if (!defined $suppress_export{$linenr} &&
2077                     $prevline =~ /^.\s*$/ &&
2078                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2079                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2080 #print "FOO B <$lines[$linenr - 1]>\n";
2081                         $suppress_export{$linenr} = 2;
2082                 }
2083                 if (defined $suppress_export{$linenr} &&
2084                     $suppress_export{$linenr} == 2) {
2085                         WARN("EXPORT_SYMBOL",
2086                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
2087                 }
2088
2089 # check for global initialisers.
2090                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2091                         ERROR("GLOBAL_INITIALISERS",
2092                               "do not initialise globals to 0 or NULL\n" .
2093                                 $herecurr);
2094                 }
2095 # check for static initialisers.
2096                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2097                         ERROR("INITIALISED_STATIC",
2098                               "do not initialise statics to 0 or NULL\n" .
2099                                 $herecurr);
2100                 }
2101
2102 # check for static const char * arrays.
2103                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
2104                         WARN("STATIC_CONST_CHAR_ARRAY",
2105                              "static const char * array should probably be static const char * const\n" .
2106                                 $herecurr);
2107                }
2108
2109 # check for static char foo[] = "bar" declarations.
2110                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
2111                         WARN("STATIC_CONST_CHAR_ARRAY",
2112                              "static char array declaration should probably be static const char\n" .
2113                                 $herecurr);
2114                }
2115
2116 # check for declarations of struct pci_device_id
2117                 if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
2118                         WARN("DEFINE_PCI_DEVICE_TABLE",
2119                              "Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id\n" . $herecurr);
2120                 }
2121
2122 # check for new typedefs, only function parameters and sparse annotations
2123 # make sense.
2124                 if ($line =~ /\btypedef\s/ &&
2125                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
2126                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
2127                     $line !~ /\b$typeTypedefs\b/ &&
2128                     $line !~ /\b__bitwise(?:__|)\b/) {
2129                         WARN("NEW_TYPEDEFS",
2130                              "do not add new typedefs\n" . $herecurr);
2131                 }
2132
2133 # * goes on variable not on type
2134                 # (char*[ const])
2135                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
2136                         my ($from, $to) = ($1, $1);
2137
2138                         # Should start with a space.
2139                         $to =~ s/^(\S)/ $1/;
2140                         # Should not end with a space.
2141                         $to =~ s/\s+$//;
2142                         # '*'s should not have spaces between.
2143                         while ($to =~ s/\*\s+\*/\*\*/) {
2144                         }
2145
2146                         #print "from<$from> to<$to>\n";
2147                         if ($from ne $to) {
2148                                 ERROR("POINTER_LOCATION",
2149                                       "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2150                         }
2151                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
2152                         my ($from, $to, $ident) = ($1, $1, $2);
2153
2154                         # Should start with a space.
2155                         $to =~ s/^(\S)/ $1/;
2156                         # Should not end with a space.
2157                         $to =~ s/\s+$//;
2158                         # '*'s should not have spaces between.
2159                         while ($to =~ s/\*\s+\*/\*\*/) {
2160                         }
2161                         # Modifiers should have spaces.
2162                         $to =~ s/(\b$Modifier$)/$1 /;
2163
2164                         #print "from<$from> to<$to> ident<$ident>\n";
2165                         if ($from ne $to && $ident !~ /^$Modifier$/) {
2166                                 ERROR("POINTER_LOCATION",
2167                                       "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2168                         }
2169                 }
2170
2171 # # no BUG() or BUG_ON()
2172 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
2173 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
2174 #                       print "$herecurr";
2175 #                       $clean = 0;
2176 #               }
2177
2178                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
2179                         WARN("LINUX_VERSION_CODE",
2180                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
2181                 }
2182
2183 # check for uses of printk_ratelimit
2184                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
2185                         WARN("PRINTK_RATELIMITED",
2186 "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
2187                 }
2188
2189 # printk should use KERN_* levels.  Note that follow on printk's on the
2190 # same line do not need a level, so we use the current block context
2191 # to try and find and validate the current printk.  In summary the current
2192 # printk includes all preceding printk's which have no newline on the end.
2193 # we assume the first bad printk is the one to report.
2194                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
2195                         my $ok = 0;
2196                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
2197                                 #print "CHECK<$lines[$ln - 1]\n";
2198                                 # we have a preceding printk if it ends
2199                                 # with "\n" ignore it, else it is to blame
2200                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
2201                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
2202                                                 $ok = 1;
2203                                         }
2204                                         last;
2205                                 }
2206                         }
2207                         if ($ok == 0) {
2208                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
2209                                      "printk() should include KERN_ facility level\n" . $herecurr);
2210                         }
2211                 }
2212
2213 # function brace can't be on same line, except for #defines of do while,
2214 # or if closed on same line
2215                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
2216                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
2217                         ERROR("OPEN_BRACE",
2218                               "open brace '{' following function declarations go on the next line\n" . $herecurr);
2219                 }
2220
2221 # open braces for enum, union and struct go on the same line.
2222                 if ($line =~ /^.\s*{/ &&
2223                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2224                         ERROR("OPEN_BRACE",
2225                               "open brace '{' following $1 go on the same line\n" . $hereprev);
2226                 }
2227
2228 # missing space after union, struct or enum definition
2229                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2230                     WARN("SPACING",
2231                          "missing space after $1 definition\n" . $herecurr);
2232                 }
2233
2234 # check for spacing round square brackets; allowed:
2235 #  1. with a type on the left -- int [] a;
2236 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2237 #  3. inside a curly brace -- = { [0...10] = 5 }
2238                 while ($line =~ /(.*?\s)\[/g) {
2239                         my ($where, $prefix) = ($-[1], $1);
2240                         if ($prefix !~ /$Type\s+$/ &&
2241                             ($where != 0 || $prefix !~ /^.\s+$/) &&
2242                             $prefix !~ /{\s+$/) {
2243                                 ERROR("BRACKET_SPACE",
2244                                       "space prohibited before open square bracket '['\n" . $herecurr);
2245                         }
2246                 }
2247
2248 # check for spaces between functions and their parentheses.
2249                 while ($line =~ /($Ident)\s+\(/g) {
2250                         my $name = $1;
2251                         my $ctx_before = substr($line, 0, $-[1]);
2252                         my $ctx = "$ctx_before$name";
2253
2254                         # Ignore those directives where spaces _are_ permitted.
2255                         if ($name =~ /^(?:
2256                                 if|for|while|switch|return|case|
2257                                 volatile|__volatile__|
2258                                 __attribute__|format|__extension__|
2259                                 asm|__asm__)$/x)
2260                         {
2261
2262                         # cpp #define statements have non-optional spaces, ie
2263                         # if there is a space between the name and the open
2264                         # parenthesis it is simply not a parameter group.
2265                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2266
2267                         # cpp #elif statement condition may start with a (
2268                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2269
2270                         # If this whole things ends with a type its most
2271                         # likely a typedef for a function.
2272                         } elsif ($ctx =~ /$Type$/) {
2273
2274                         } else {
2275                                 WARN("SPACING",
2276                                      "space prohibited between function name and open parenthesis '('\n" . $herecurr);
2277                         }
2278                 }
2279 # Check operator spacing.
2280                 if (!($line=~/\#\s*include/)) {
2281                         my $ops = qr{
2282                                 <<=|>>=|<=|>=|==|!=|
2283                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2284                                 =>|->|<<|>>|<|>|=|!|~|
2285                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2286                                 \?|:
2287                         }x;
2288                         my @elements = split(/($ops|;)/, $opline);
2289                         my $off = 0;
2290
2291                         my $blank = copy_spacing($opline);
2292
2293                         for (my $n = 0; $n < $#elements; $n += 2) {
2294                                 $off += length($elements[$n]);
2295
2296                                 # Pick up the preceding and succeeding characters.
2297                                 my $ca = substr($opline, 0, $off);
2298                                 my $cc = '';
2299                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2300                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2301                                 }
2302                                 my $cb = "$ca$;$cc";
2303
2304                                 my $a = '';
2305                                 $a = 'V' if ($elements[$n] ne '');
2306                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2307                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2308                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2309                                 $a = 'O' if ($elements[$n] eq '');
2310                                 $a = 'E' if ($ca =~ /^\s*$/);
2311
2312                                 my $op = $elements[$n + 1];
2313
2314                                 my $c = '';
2315                                 if (defined $elements[$n + 2]) {
2316                                         $c = 'V' if ($elements[$n + 2] ne '');
2317                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2318                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2319                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2320                                         $c = 'O' if ($elements[$n + 2] eq '');
2321                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2322                                 } else {
2323                                         $c = 'E';
2324                                 }
2325
2326                                 my $ctx = "${a}x${c}";
2327
2328                                 my $at = "(ctx:$ctx)";
2329
2330                                 my $ptr = substr($blank, 0, $off) . "^";
2331                                 my $hereptr = "$hereline$ptr\n";
2332
2333                                 # Pull out the value of this operator.
2334                                 my $op_type = substr($curr_values, $off + 1, 1);
2335
2336                                 # Get the full operator variant.
2337                                 my $opv = $op . substr($curr_vars, $off, 1);
2338
2339                                 # Ignore operators passed as parameters.
2340                                 if ($op_type ne 'V' &&
2341                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2342
2343 #                               # Ignore comments
2344 #                               } elsif ($op =~ /^$;+$/) {
2345
2346                                 # ; should have either the end of line or a space or \ after it
2347                                 } elsif ($op eq ';') {
2348                                         if ($ctx !~ /.x[WEBC]/ &&
2349                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2350                                                 ERROR("SPACING",
2351                                                       "space required after that '$op' $at\n" . $hereptr);
2352                                         }
2353
2354                                 # // is a comment
2355                                 } elsif ($op eq '//') {
2356
2357                                 # No spaces for:
2358                                 #   ->
2359                                 #   :   when part of a bitfield
2360                                 } elsif ($op eq '->' || $opv eq ':B') {
2361                                         if ($ctx =~ /Wx.|.xW/) {
2362                                                 ERROR("SPACING",
2363                                                       "spaces prohibited around that '$op' $at\n" . $hereptr);
2364                                         }
2365
2366                                 # , must have a space on the right.
2367                                 } elsif ($op eq ',') {
2368                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2369                                                 ERROR("SPACING",
2370                                                       "space required after that '$op' $at\n" . $hereptr);
2371                                         }
2372
2373                                 # '*' as part of a type definition -- reported already.
2374                                 } elsif ($opv eq '*_') {
2375                                         #warn "'*' is part of type\n";
2376
2377                                 # unary operators should have a space before and
2378                                 # none after.  May be left adjacent to another
2379                                 # unary operator, or a cast
2380                                 } elsif ($op eq '!' || $op eq '~' ||
2381                                          $opv eq '*U' || $opv eq '-U' ||
2382                                          $opv eq '&U' || $opv eq '&&U') {
2383                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2384                                                 ERROR("SPACING",
2385                                                       "space required before that '$op' $at\n" . $hereptr);
2386                                         }
2387                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2388                                                 # A unary '*' may be const
2389
2390                                         } elsif ($ctx =~ /.xW/) {
2391                                                 ERROR("SPACING",
2392                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2393                                         }
2394
2395                                 # unary ++ and unary -- are allowed no space on one side.
2396                                 } elsif ($op eq '++' or $op eq '--') {
2397                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2398                                                 ERROR("SPACING",
2399                                                       "space required one side of that '$op' $at\n" . $hereptr);
2400                                         }
2401                                         if ($ctx =~ /Wx[BE]/ ||
2402                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2403                                                 ERROR("SPACING",
2404                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2405                                         }
2406                                         if ($ctx =~ /ExW/) {
2407                                                 ERROR("SPACING",
2408                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2409                                         }
2410
2411
2412                                 # << and >> may either have or not have spaces both sides
2413                                 } elsif ($op eq '<<' or $op eq '>>' or
2414                                          $op eq '&' or $op eq '^' or $op eq '|' or
2415                                          $op eq '+' or $op eq '-' or
2416                                          $op eq '*' or $op eq '/' or
2417                                          $op eq '%')
2418                                 {
2419                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2420                                                 ERROR("SPACING",
2421                                                       "need consistent spacing around '$op' $at\n" .
2422                                                         $hereptr);
2423                                         }
2424
2425                                 # A colon needs no spaces before when it is
2426                                 # terminating a case value or a label.
2427                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2428                                         if ($ctx =~ /Wx./) {
2429                                                 ERROR("SPACING",
2430                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2431                                         }
2432
2433                                 # All the others need spaces both sides.
2434                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2435                                         my $ok = 0;
2436
2437                                         # Ignore email addresses <foo@bar>
2438                                         if (($op eq '<' &&
2439                                              $cc =~ /^\S+\@\S+>/) ||
2440                                             ($op eq '>' &&
2441                                              $ca =~ /<\S+\@\S+$/))
2442                                         {
2443                                                 $ok = 1;
2444                                         }
2445
2446                                         # Ignore ?:
2447                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2448                                             ($op eq '?' && $cc =~ /^:/)) {
2449                                                 $ok = 1;
2450                                         }
2451
2452                                         if ($ok == 0) {
2453                                                 ERROR("SPACING",
2454                                                       "spaces required around that '$op' $at\n" . $hereptr);
2455                                         }
2456                                 }
2457                                 $off += length($elements[$n + 1]);
2458                         }
2459                 }
2460
2461 # check for multiple assignments
2462                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2463                         CHK("MULTIPLE_ASSIGNMENTS",
2464                             "multiple assignments should be avoided\n" . $herecurr);
2465                 }
2466
2467 ## # check for multiple declarations, allowing for a function declaration
2468 ## # continuation.
2469 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2470 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2471 ##
2472 ##                      # Remove any bracketed sections to ensure we do not
2473 ##                      # falsly report the parameters of functions.
2474 ##                      my $ln = $line;
2475 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2476 ##                      }
2477 ##                      if ($ln =~ /,/) {
2478 ##                              WARN("MULTIPLE_DECLARATION",
2479 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
2480 ##                      }
2481 ##              }
2482
2483 #need space before brace following if, while, etc
2484                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2485                     $line =~ /do{/) {
2486                         ERROR("SPACING",
2487                               "space required before the open brace '{'\n" . $herecurr);
2488                 }
2489
2490 # closing brace should have a space following it when it has anything
2491 # on the line
2492                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2493                         ERROR("SPACING",
2494                               "space required after that close brace '}'\n" . $herecurr);
2495                 }
2496
2497 # check spacing on square brackets
2498                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2499                         ERROR("SPACING",
2500                               "space prohibited after that open square bracket '['\n" . $herecurr);
2501                 }
2502                 if ($line =~ /\s\]/) {
2503                         ERROR("SPACING",
2504                               "space prohibited before that close square bracket ']'\n" . $herecurr);
2505                 }
2506
2507 # check spacing on parentheses
2508                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2509                     $line !~ /for\s*\(\s+;/) {
2510                         ERROR("SPACING",
2511                               "space prohibited after that open parenthesis '('\n" . $herecurr);
2512                 }
2513                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2514                     $line !~ /for\s*\(.*;\s+\)/ &&
2515                     $line !~ /:\s+\)/) {
2516                         ERROR("SPACING",
2517                               "space prohibited before that close parenthesis ')'\n" . $herecurr);
2518                 }
2519
2520 #goto labels aren't indented, allow a single space however
2521                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2522                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2523                         WARN("INDENTED_LABEL",
2524                              "labels should not be indented\n" . $herecurr);
2525                 }
2526
2527 # Return is not a function.
2528                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2529                         my $spacing = $1;
2530                         my $value = $2;
2531
2532                         # Flatten any parentheses
2533                         $value =~ s/\(/ \(/g;
2534                         $value =~ s/\)/\) /g;
2535                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2536                                $value !~ /(?:$Ident|-?$Constant)\s*
2537                                              $Compare\s*
2538                                              (?:$Ident|-?$Constant)/x &&
2539                                $value =~ s/\([^\(\)]*\)/1/) {
2540                         }
2541 #print "value<$value>\n";
2542                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2543                                 ERROR("RETURN_PARENTHESES",
2544                                       "return is not a function, parentheses are not required\n" . $herecurr);
2545
2546                         } elsif ($spacing !~ /\s+/) {
2547                                 ERROR("SPACING",
2548                                       "space required before the open parenthesis '('\n" . $herecurr);
2549                         }
2550                 }
2551 # Return of what appears to be an errno should normally be -'ve
2552                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2553                         my $name = $1;
2554                         if ($name ne 'EOF' && $name ne 'ERROR') {
2555                                 WARN("USE_NEGATIVE_ERRNO",
2556                                      "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2557                         }
2558                 }
2559
2560 # typecasts on min/max could be min_t/max_t
2561                 if ($line =~ /^\+(?:.*?)\b(min|max)\s*\($Typecast{0,1}($LvalOrFunc)\s*,\s*$Typecast{0,1}($LvalOrFunc)\s*\)/) {
2562                         if (defined $2 || defined $8) {
2563                                 my $call = $1;
2564                                 my $cast1 = deparenthesize($2);
2565                                 my $arg1 = $3;
2566                                 my $cast2 = deparenthesize($8);
2567                                 my $arg2 = $9;
2568                                 my $cast;
2569
2570                                 if ($cast1 ne "" && $cast2 ne "") {
2571                                         $cast = "$cast1 or $cast2";
2572                                 } elsif ($cast1 ne "") {
2573                                         $cast = $cast1;
2574                                 } else {
2575                                         $cast = $cast2;
2576                                 }
2577                                 WARN("MINMAX",
2578                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . $herecurr);
2579                         }
2580                 }
2581
2582 # Need a space before open parenthesis after if, while etc
2583                 if ($line=~/\b(if|while|for|switch)\(/) {
2584                         ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr);
2585                 }
2586
2587 # Check for illegal assignment in if conditional -- and check for trailing
2588 # statements after the conditional.
2589                 if ($line =~ /do\s*(?!{)/) {
2590                         my ($stat_next) = ctx_statement_block($line_nr_next,
2591                                                 $remain_next, $off_next);
2592                         $stat_next =~ s/\n./\n /g;
2593                         ##print "stat<$stat> stat_next<$stat_next>\n";
2594
2595                         if ($stat_next =~ /^\s*while\b/) {
2596                                 # If the statement carries leading newlines,
2597                                 # then count those as offsets.
2598                                 my ($whitespace) =
2599                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2600                                 my $offset =
2601                                         statement_rawlines($whitespace) - 1;
2602
2603                                 $suppress_whiletrailers{$line_nr_next +
2604                                                                 $offset} = 1;
2605                         }
2606                 }
2607                 if (!defined $suppress_whiletrailers{$linenr} &&
2608                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2609                         my ($s, $c) = ($stat, $cond);
2610
2611                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2612                                 ERROR("ASSIGN_IN_IF",
2613                                       "do not use assignment in if condition\n" . $herecurr);
2614                         }
2615
2616                         # Find out what is on the end of the line after the
2617                         # conditional.
2618                         substr($s, 0, length($c), '');
2619                         $s =~ s/\n.*//g;
2620                         $s =~ s/$;//g;  # Remove any comments
2621                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2622                             $c !~ /}\s*while\s*/)
2623                         {
2624                                 # Find out how long the conditional actually is.
2625                                 my @newlines = ($c =~ /\n/gs);
2626                                 my $cond_lines = 1 + $#newlines;
2627                                 my $stat_real = '';
2628
2629                                 $stat_real = raw_line($linenr, $cond_lines)
2630                                                         . "\n" if ($cond_lines);
2631                                 if (defined($stat_real) && $cond_lines > 1) {
2632                                         $stat_real = "[...]\n$stat_real";
2633                                 }
2634
2635                                 ERROR("TRAILING_STATEMENTS",
2636                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
2637                         }
2638                 }
2639
2640 # Check for bitwise tests written as boolean
2641                 if ($line =~ /
2642                         (?:
2643                                 (?:\[|\(|\&\&|\|\|)
2644                                 \s*0[xX][0-9]+\s*
2645                                 (?:\&\&|\|\|)
2646                         |
2647                                 (?:\&\&|\|\|)
2648                                 \s*0[xX][0-9]+\s*
2649                                 (?:\&\&|\|\||\)|\])
2650                         )/x)
2651                 {
2652                         WARN("HEXADECIMAL_BOOLEAN_TEST",
2653                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2654                 }
2655
2656 # if and else should not have general statements after it
2657                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2658                         my $s = $1;
2659                         $s =~ s/$;//g;  # Remove any comments
2660                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2661                                 ERROR("TRAILING_STATEMENTS",
2662                                       "trailing statements should be on next line\n" . $herecurr);
2663                         }
2664                 }
2665 # if should not continue a brace
2666                 if ($line =~ /}\s*if\b/) {
2667                         ERROR("TRAILING_STATEMENTS",
2668                               "trailing statements should be on next line\n" .
2669                                 $herecurr);
2670                 }
2671 # case and default should not have general statements after them
2672                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2673                     $line !~ /\G(?:
2674                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2675                         \s*return\s+
2676                     )/xg)
2677                 {
2678                         ERROR("TRAILING_STATEMENTS",
2679                               "trailing statements should be on next line\n" . $herecurr);
2680                 }
2681
2682                 # Check for }<nl>else {, these must be at the same
2683                 # indent level to be relevant to each other.
2684                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2685                                                 $previndent == $indent) {
2686                         ERROR("ELSE_AFTER_BRACE",
2687                               "else should follow close brace '}'\n" . $hereprev);
2688                 }
2689
2690                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2691                                                 $previndent == $indent) {
2692                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2693
2694                         # Find out what is on the end of the line after the
2695                         # conditional.
2696                         substr($s, 0, length($c), '');
2697                         $s =~ s/\n.*//g;
2698
2699                         if ($s =~ /^\s*;/) {
2700                                 ERROR("WHILE_AFTER_BRACE",
2701                                       "while should follow close brace '}'\n" . $hereprev);
2702                         }
2703                 }
2704
2705 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2706 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2707 #                   print "No studly caps, use _\n";
2708 #                   print "$herecurr";
2709 #                   $clean = 0;
2710 #               }
2711
2712 #no spaces allowed after \ in define
2713                 if ($line=~/\#\s*define.*\\\s$/) {
2714                         WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
2715                              "Whitepspace after \\ makes next lines useless\n" . $herecurr);
2716                 }
2717
2718 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2719                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2720                         my $file = "$1.h";
2721                         my $checkfile = "include/linux/$file";
2722                         if (-f "$root/$checkfile" &&
2723                             $realfile ne $checkfile &&
2724                             $1 !~ /$allowed_asm_includes/)
2725                         {
2726                                 if ($realfile =~ m{^arch/}) {
2727                                         CHK("ARCH_INCLUDE_LINUX",
2728                                             "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2729                                 } else {
2730                                         WARN("INCLUDE_LINUX",
2731                                              "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2732                                 }
2733                         }
2734                 }
2735
2736 # multi-statement macros should be enclosed in a do while loop, grab the
2737 # first statement and ensure its the whole macro if its not enclosed
2738 # in a known good container
2739                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2740                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2741                         my $ln = $linenr;
2742                         my $cnt = $realcnt;
2743                         my ($off, $dstat, $dcond, $rest);
2744                         my $ctx = '';
2745
2746                         my $args = defined($1);
2747
2748                         # Find the end of the macro and limit our statement
2749                         # search to that.
2750                         while ($cnt > 0 && defined $lines[$ln - 1] &&
2751                                 $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2752                         {
2753                                 $ctx .= $rawlines[$ln - 1] . "\n";
2754                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2755                                 $ln++;
2756                         }
2757                         $ctx .= $rawlines[$ln - 1];
2758
2759                         ($dstat, $dcond, $ln, $cnt, $off) =
2760                                 ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2761                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2762                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2763
2764                         # Extract the remainder of the define (if any) and
2765                         # rip off surrounding spaces, and trailing \'s.
2766                         $rest = '';
2767                         while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2768                                 #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2769                                 if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2770                                         $rest .= substr($lines[$ln - 1], $off) . "\n";
2771                                         $cnt--;
2772                                 }
2773                                 $ln++;
2774                                 $off = 0;
2775                         }
2776                         $rest =~ s/\\\n.//g;
2777                         $rest =~ s/^\s*//s;
2778                         $rest =~ s/\s*$//s;
2779
2780                         # Clean up the original statement.
2781                         if ($args) {
2782                                 substr($dstat, 0, length($dcond), '');
2783                         } else {
2784                                 $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2785                         }
2786                         $dstat =~ s/$;//g;
2787                         $dstat =~ s/\\\n.//g;
2788                         $dstat =~ s/^\s*//s;
2789                         $dstat =~ s/\s*$//s;
2790
2791                         # Flatten any parentheses and braces
2792                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2793                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2794                                $dstat =~ s/\[[^\{\}]*\]/1/)
2795                         {
2796                         }
2797
2798                         my $exceptions = qr{
2799                                 $Declare|
2800                                 module_param_named|
2801                                 MODULE_PARAM_DESC|
2802                                 DECLARE_PER_CPU|
2803                                 DEFINE_PER_CPU|
2804                                 __typeof__\(|
2805                                 union|
2806                                 struct|
2807                                 \.$Ident\s*=\s*|
2808                                 ^\"|\"$
2809                         }x;
2810                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2811                         if ($rest ne '' && $rest ne ',') {
2812                                 if ($rest !~ /while\s*\(/ &&
2813                                     $dstat !~ /$exceptions/)
2814                                 {
2815                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
2816                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2817                                 }
2818
2819                         } elsif ($ctx !~ /;/) {
2820                                 if ($dstat ne '' &&
2821                                     $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2822                                     $dstat !~ /$exceptions/ &&
2823                                     $dstat !~ /^\.$Ident\s*=/ &&
2824                                     $dstat =~ /$Operators/)
2825                                 {
2826                                         ERROR("COMPLEX_MACRO",
2827                                               "Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2828                                 }
2829                         }
2830                 }
2831
2832 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
2833 # all assignments may have only one of the following with an assignment:
2834 #       .
2835 #       ALIGN(...)
2836 #       VMLINUX_SYMBOL(...)
2837                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
2838                         WARN("MISSING_VMLINUX_SYMBOL",
2839                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
2840                 }
2841
2842 # check for redundant bracing round if etc
2843                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
2844                         my ($level, $endln, @chunks) =
2845                                 ctx_statement_full($linenr, $realcnt, 1);
2846                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2847                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
2848                         if ($#chunks > 0 && $level == 0) {
2849                                 my $allowed = 0;
2850                                 my $seen = 0;
2851                                 my $herectx = $here . "\n";
2852                                 my $ln = $linenr - 1;
2853                                 for my $chunk (@chunks) {
2854                                         my ($cond, $block) = @{$chunk};
2855
2856                                         # If the condition carries leading newlines, then count those as offsets.
2857                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2858                                         my $offset = statement_rawlines($whitespace) - 1;
2859
2860                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2861
2862                                         # We have looked at and allowed this specific line.
2863                                         $suppress_ifbraces{$ln + $offset} = 1;
2864
2865                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2866                                         $ln += statement_rawlines($block) - 1;
2867
2868                                         substr($block, 0, length($cond), '');
2869
2870                                         $seen++ if ($block =~ /^\s*{/);
2871
2872                                         #print "cond<$cond> block<$block> allowed<$allowed>\n";
2873                                         if (statement_lines($cond) > 1) {
2874                                                 #print "APW: ALLOWED: cond<$cond>\n";
2875                                                 $allowed = 1;
2876                                         }
2877                                         if ($block =~/\b(?:if|for|while)\b/) {
2878                                                 #print "APW: ALLOWED: block<$block>\n";
2879                                                 $allowed = 1;
2880                                         }
2881                                         if (statement_block_size($block) > 1) {
2882                                                 #print "APW: ALLOWED: lines block<$block>\n";
2883                                                 $allowed = 1;
2884                                         }
2885                                 }
2886                                 if ($seen && !$allowed) {
2887                                         WARN("BRACES",
2888                                              "braces {} are not necessary for any arm of this statement\n" . $herectx);
2889                                 }
2890                         }
2891                 }
2892                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2893                                         $line =~ /\b(if|while|for|else)\b/) {
2894                         my $allowed = 0;
2895
2896                         # Check the pre-context.
2897                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2898                                 #print "APW: ALLOWED: pre<$1>\n";
2899                                 $allowed = 1;
2900                         }
2901
2902                         my ($level, $endln, @chunks) =
2903                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2904
2905                         # Check the condition.
2906                         my ($cond, $block) = @{$chunks[0]};
2907                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
2908                         if (defined $cond) {
2909                                 substr($block, 0, length($cond), '');
2910                         }
2911                         if (statement_lines($cond) > 1) {
2912                                 #print "APW: ALLOWED: cond<$cond>\n";
2913                                 $allowed = 1;
2914                         }
2915                         if ($block =~/\b(?:if|for|while)\b/) {
2916                                 #print "APW: ALLOWED: block<$block>\n";
2917                                 $allowed = 1;
2918                         }
2919                         if (statement_block_size($block) > 1) {
2920                                 #print "APW: ALLOWED: lines block<$block>\n";
2921                                 $allowed = 1;
2922                         }
2923                         # Check the post-context.
2924                         if (defined $chunks[1]) {
2925                                 my ($cond, $block) = @{$chunks[1]};
2926                                 if (defined $cond) {
2927                                         substr($block, 0, length($cond), '');
2928                                 }
2929                                 if ($block =~ /^\s*\{/) {
2930                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
2931                                         $allowed = 1;
2932                                 }
2933                         }
2934                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
2935                                 my $herectx = $here . "\n";;
2936                                 my $cnt = statement_rawlines($block);
2937
2938                                 for (my $n = 0; $n < $cnt; $n++) {
2939                                         $herectx .= raw_line($linenr, $n) . "\n";;
2940                                 }
2941
2942                                 WARN("BRACES",
2943                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
2944                         }
2945                 }
2946
2947 # don't include deprecated include files (uses RAW line)
2948                 for my $inc (@dep_includes) {
2949                         if ($rawline =~ m@^.\s*\#\s*include\s*\<$inc>@) {
2950                                 ERROR("DEPRECATED_INCLUDE",
2951                                       "Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2952                         }
2953                 }
2954
2955 # don't use deprecated functions
2956                 for my $func (@dep_functions) {
2957                         if ($line =~ /\b$func\b/) {
2958                                 ERROR("DEPRECATED_FUNCTION",
2959                                       "Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2960                         }
2961                 }
2962
2963 # no volatiles please
2964                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2965                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2966                         WARN("VOLATILE",
2967                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
2968                 }
2969
2970 # warn about #if 0
2971                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2972                         CHK("REDUNDANT_CODE",
2973                             "if this code is redundant consider removing it\n" .
2974                                 $herecurr);
2975                 }
2976
2977 # check for needless kfree() checks
2978                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2979                         my $expr = $1;
2980                         if ($line =~ /\bkfree\(\Q$expr\E\);/) {
2981                                 WARN("NEEDLESS_KFREE",
2982                                      "kfree(NULL) is safe this check is probably not required\n" . $hereprev);
2983                         }
2984                 }
2985 # check for needless usb_free_urb() checks
2986                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2987                         my $expr = $1;
2988                         if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
2989                                 WARN("NEEDLESS_USB_FREE_URB",
2990                                      "usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
2991                         }
2992                 }
2993
2994 # prefer usleep_range over udelay
2995                 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
2996                         # ignore udelay's < 10, however
2997                         if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
2998                                 CHK("USLEEP_RANGE",
2999                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
3000                         }
3001                 }
3002
3003 # warn about unexpectedly long msleep's
3004                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
3005                         if ($1 < 20) {
3006                                 WARN("MSLEEP",
3007                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
3008                         }
3009                 }
3010
3011 # warn about #ifdefs in C files
3012 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
3013 #                       print "#ifdef in C files should be avoided\n";
3014 #                       print "$herecurr";
3015 #                       $clean = 0;
3016 #               }
3017
3018 # warn about spacing in #ifdefs
3019                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
3020                         ERROR("SPACING",
3021                               "exactly one space required after that #$1\n" . $herecurr);
3022                 }
3023
3024 # check for spinlock_t definitions without a comment.
3025                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
3026                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
3027                         my $which = $1;
3028                         if (!ctx_has_comment($first_line, $linenr)) {
3029                                 CHK("UNCOMMENTED_DEFINITION",
3030                                     "$1 definition without comment\n" . $herecurr);
3031                         }
3032                 }
3033 # check for memory barriers without a comment.
3034                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
3035                         if (!ctx_has_comment($first_line, $linenr)) {
3036                                 CHK("MEMORY_BARRIER",
3037                                     "memory barrier without comment\n" . $herecurr);
3038                         }
3039                 }
3040 # check of hardware specific defines
3041                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
3042                         CHK("ARCH_DEFINES",
3043                             "architecture specific defines should be avoided\n" .  $herecurr);
3044                 }
3045
3046 # Check that the storage class is at the beginning of a declaration
3047                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
3048                         WARN("STORAGE_CLASS",
3049                              "storage class should be at the beginning of the declaration\n" . $herecurr)
3050                 }
3051
3052 # check the location of the inline attribute, that it is between
3053 # storage class and type.
3054                 if ($line =~ /\b$Type\s+$Inline\b/ ||
3055                     $line =~ /\b$Inline\s+$Storage\b/) {
3056                         ERROR("INLINE_LOCATION",
3057                               "inline keyword should sit between storage class and type\n" . $herecurr);
3058                 }
3059
3060 # Check for __inline__ and __inline, prefer inline
3061                 if ($line =~ /\b(__inline__|__inline)\b/) {
3062                         WARN("INLINE",
3063                              "plain inline is preferred over $1\n" . $herecurr);
3064                 }
3065
3066 # Check for __attribute__ packed, prefer __packed
3067                 if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
3068                         WARN("PREFER_PACKED",
3069                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
3070                 }
3071
3072 # Check for __attribute__ aligned, prefer __aligned
3073                 if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
3074                         WARN("PREFER_ALIGNED",
3075                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
3076                 }
3077
3078 # check for sizeof(&)
3079                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
3080                         WARN("SIZEOF_ADDRESS",
3081                              "sizeof(& should be avoided\n" . $herecurr);
3082                 }
3083
3084 # check for line continuations in quoted strings with odd counts of "
3085                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
3086                         WARN("LINE_CONTINUATIONS",
3087                              "Avoid line continuations in quoted strings\n" . $herecurr);
3088                 }
3089
3090 # check for new externs in .c files.
3091                 if ($realfile =~ /\.c$/ && defined $stat &&
3092                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
3093                 {
3094                         my $function_name = $1;
3095                         my $paren_space = $2;
3096
3097                         my $s = $stat;
3098                         if (defined $cond) {
3099                                 substr($s, 0, length($cond), '');
3100                         }
3101                         if ($s =~ /^\s*;/ &&
3102                             $function_name ne 'uninitialized_var')
3103                         {
3104                                 WARN("AVOID_EXTERNS",
3105                                      "externs should be avoided in .c files\n" .  $herecurr);
3106                         }
3107
3108                         if ($paren_space =~ /\n/) {
3109                                 WARN("FUNCTION_ARGUMENTS",
3110                                      "arguments for function declarations should follow identifier\n" . $herecurr);
3111                         }
3112
3113                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
3114                     $stat =~ /^.\s*extern\s+/)
3115                 {
3116                         WARN("AVOID_EXTERNS",
3117                              "externs should be avoided in .c files\n" .  $herecurr);
3118                 }
3119
3120 # checks for new __setup's
3121                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
3122                         my $name = $1;
3123
3124                         if (!grep(/$name/, @setup_docs)) {
3125                                 CHK("UNDOCUMENTED_SETUP",
3126                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
3127                         }
3128                 }
3129
3130 # check for pointless casting of kmalloc return
3131                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
3132                         WARN("UNNECESSARY_CASTS",
3133                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
3134                 }
3135
3136 # check for multiple semicolons
3137                 if ($line =~ /;\s*;\s*$/) {
3138                     WARN("ONE_SEMICOLON",
3139                          "Statements terminations use 1 semicolon\n" . $herecurr);
3140                 }
3141
3142 # check for gcc specific __FUNCTION__
3143                 if ($line =~ /__FUNCTION__/) {
3144                         WARN("USE_FUNC",
3145                              "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
3146                 }
3147
3148 # check for semaphores initialized locked
3149                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
3150                         WARN("CONSIDER_COMPLETION",
3151                              "consider using a completion\n" . $herecurr);
3152
3153                 }
3154 # recommend kstrto* over simple_strto*
3155                 if ($line =~ /\bsimple_(strto.*?)\s*\(/) {
3156                         WARN("CONSIDER_KSTRTO",
3157                              "consider using kstrto* in preference to simple_$1\n" . $herecurr);
3158                 }
3159 # check for __initcall(), use device_initcall() explicitly please
3160                 if ($line =~ /^.\s*__initcall\s*\(/) {
3161                         WARN("USE_DEVICE_INITCALL",
3162                              "please use device_initcall() instead of __initcall()\n" . $herecurr);
3163                 }
3164 # check for various ops structs, ensure they are const.
3165                 my $struct_ops = qr{acpi_dock_ops|
3166                                 address_space_operations|
3167                                 backlight_ops|
3168                                 block_device_operations|
3169                                 dentry_operations|
3170                                 dev_pm_ops|
3171                                 dma_map_ops|
3172                                 extent_io_ops|
3173                                 file_lock_operations|
3174                                 file_operations|
3175                                 hv_ops|
3176                                 ide_dma_ops|
3177                                 intel_dvo_dev_ops|
3178                                 item_operations|
3179                                 iwl_ops|
3180                                 kgdb_arch|
3181                                 kgdb_io|
3182                                 kset_uevent_ops|
3183                                 lock_manager_operations|
3184                                 microcode_ops|
3185                                 mtrr_ops|
3186                                 neigh_ops|
3187                                 nlmsvc_binding|
3188                                 pci_raw_ops|
3189                                 pipe_buf_operations|
3190                                 platform_hibernation_ops|
3191                                 platform_suspend_ops|
3192                                 proto_ops|
3193                                 rpc_pipe_ops|
3194                                 seq_operations|
3195                                 snd_ac97_build_ops|
3196                                 soc_pcmcia_socket_ops|
3197                                 stacktrace_ops|
3198                                 sysfs_ops|
3199                                 tty_operations|
3200                                 usb_mon_operations|
3201                                 wd_ops}x;
3202                 if ($line !~ /\bconst\b/ &&
3203                     $line =~ /\bstruct\s+($struct_ops)\b/) {
3204                         WARN("CONST_STRUCT",
3205                              "struct $1 should normally be const\n" .
3206                                 $herecurr);
3207                 }
3208
3209 # use of NR_CPUS is usually wrong
3210 # ignore definitions of NR_CPUS and usage to define arrays as likely right
3211                 if ($line =~ /\bNR_CPUS\b/ &&
3212                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
3213                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
3214                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
3215                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
3216                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
3217                 {
3218                         WARN("NR_CPUS",
3219                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
3220                 }
3221
3222 # check for %L{u,d,i} in strings
3223                 my $string;
3224                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
3225                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
3226                         $string =~ s/%%/__/g;
3227                         if ($string =~ /(?<!%)%L[udi]/) {
3228                                 WARN("PRINTF_L",
3229                                      "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
3230                                 last;
3231                         }
3232                 }
3233
3234 # whine mightly about in_atomic
3235                 if ($line =~ /\bin_atomic\s*\(/) {
3236                         if ($realfile =~ m@^drivers/@) {
3237                                 ERROR("IN_ATOMIC",
3238                                       "do not use in_atomic in drivers\n" . $herecurr);
3239                         } elsif ($realfile !~ m@^kernel/@) {
3240                                 WARN("IN_ATOMIC",
3241                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
3242                         }
3243                 }
3244
3245 # check for lockdep_set_novalidate_class
3246                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
3247                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
3248                         if ($realfile !~ m@^kernel/lockdep@ &&
3249                             $realfile !~ m@^include/linux/lockdep@ &&
3250                             $realfile !~ m@^drivers/base/core@) {
3251                                 ERROR("LOCKDEP",
3252                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
3253                         }
3254                 }
3255
3256                 if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
3257                     $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
3258                         WARN("EXPORTED_WORLD_WRITABLE",
3259                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
3260                 }
3261
3262                 # Check for memset with swapped arguments
3263                 if ($line =~ /memset.*\,(\ |)(0x|)0(\ |0|)\);/) {
3264                         ERROR("MEMSET",
3265                               "memset size is 3rd argument, not the second.\n" . $herecurr);
3266                 }
3267         }
3268
3269         # If we have no input at all, then there is nothing to report on
3270         # so just keep quiet.
3271         if ($#rawlines == -1) {
3272                 exit(0);
3273         }
3274
3275         # In mailback mode only produce a report in the negative, for
3276         # things that appear to be patches.
3277         if ($mailback && ($clean == 1 || !$is_patch)) {
3278                 exit(0);
3279         }
3280
3281         # This is not a patch, and we are are in 'no-patch' mode so
3282         # just keep quiet.
3283         if (!$chk_patch && !$is_patch) {
3284                 exit(0);
3285         }
3286
3287         if (!$is_patch) {
3288                 ERROR("NOT_UNIFIED_DIFF",
3289                       "Does not appear to be a unified-diff format patch\n");
3290         }
3291         if ($is_patch && $chk_signoff && $signoff == 0) {
3292                 ERROR("MISSING_SIGN_OFF",
3293                       "Missing Signed-off-by: line(s)\n");
3294         }
3295
3296         print report_dump();
3297         if ($summary && !($clean == 1 && $quiet == 1)) {
3298                 print "$filename " if ($summary_file);
3299                 print "total: $cnt_error errors, $cnt_warn warnings, " .
3300                         (($check)? "$cnt_chk checks, " : "") .
3301                         "$cnt_lines lines checked\n";
3302                 print "\n" if ($quiet == 0);
3303         }
3304
3305         if ($quiet == 0) {
3306                 # If there were whitespace errors which cleanpatch can fix
3307                 # then suggest that.
3308                 if ($rpt_cleaners) {
3309                         print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
3310                         print "      scripts/cleanfile\n\n";
3311                         $rpt_cleaners = 0;
3312                 }
3313         }
3314
3315         if (keys %ignore_type) {
3316             print "NOTE: Ignored message types:";
3317             foreach my $ignore (sort keys %ignore_type) {
3318                 print " $ignore";
3319             }
3320             print "\n";
3321             print "\n" if ($quiet == 0);
3322         }
3323
3324         if ($clean == 1 && $quiet == 0) {
3325                 print "$vname has no obvious style problems and is ready for submission.\n"
3326         }
3327         if ($clean == 0 && $quiet == 0) {
3328                 print << "EOM";
3329 $vname has style problems, please review.
3330
3331 If any of these errors are false positives, please report
3332 them to the maintainer, see CHECKPATCH in MAINTAINERS.
3333 EOM
3334         }
3335
3336         return $clean;
3337 }