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 = '0.31';
  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 $root;
  30 my %debug;
  31 my $help = 0;
  32
  33 sub help {
  34         my ($exitcode) = @_;
  35
  36         print << "EOM";
  37 Usage: $P [OPTION]... [FILE]...
  38 Version: $V
  39
  40 Options:
  41   -q, --quiet                quiet
  42   --no-tree                  run without a kernel tree
  43   --no-signoff               do not check for 'Signed-off-by' line
  44   --patch                    treat FILE as patchfile (default)
  45   --emacs                    emacs compile window format
  46   --terse                    one line per report
  47   -f, --file                 treat FILE as regular source file
  48   --subjective, --strict     enable more subjective tests
  49   --root=PATH                PATH to the kernel tree root
  50   --no-summary               suppress the per-file summary
  51   --mailback                 only produce a report in case of warnings/errors
  52   --summary-file             include the filename in summary
  53   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  54                              'values', 'possible', 'type', and 'attr' (default
  55                              is all off)
  56   --test-only=WORD           report only warnings/errors containing WORD
  57                              literally
  58   -h, --help, --version      display this help and exit
  59
  60 When FILE is - read standard input.
  61 EOM
  62
  63         exit($exitcode);
  64 }
  65
  66 GetOptions(
  67         'q|quiet+'      => \$quiet,
  68         'tree!'         => \$tree,
  69         'signoff!'      => \$chk_signoff,
  70         'patch!'        => \$chk_patch,
  71         'emacs!'        => \$emacs,
  72         'terse!'        => \$terse,
  73         'f|file!'       => \$file,
  74         'subjective!'   => \$check,
  75         'strict!'       => \$check,
  76         'root=s'        => \$root,
  77         'summary!'      => \$summary,
  78         'mailback!'     => \$mailback,
  79         'summary-file!' => \$summary_file,
  80
  81         'debug=s'       => \%debug,
  82         'test-only=s'   => \$tst_only,
  83         'h|help'        => \$help,
  84         'version'       => \$help
  85 ) or help(1);
  86
  87 help(0) if ($help);
  88
  89 my $exit = 0;
  90
  91 if ($#ARGV < 0) {
  92         print "$P: no input files\n";
  93         exit(1);
  94 }
  95
  96 my $dbg_values = 0;
  97 my $dbg_possible = 0;
  98 my $dbg_type = 0;
  99 my $dbg_attr = 0;
 100 for my $key (keys %debug) {
 101         ## no critic
 102         eval "\${dbg_$key} = '$debug{$key}';";
 103         die "$@" if ($@);
 104 }
 105
 106 my $rpt_cleaners = 0;
 107
 108 if ($terse) {
 109         $emacs = 1;
 110         $quiet++;
 111 }
 112
 113 if ($tree) {
 114         if (defined $root) {
 115                 if (!top_of_kernel_tree($root)) {
 116                         die "$P: $root: --root does not point at a valid tree\n";
 117                 }
 118         } else {
 119                 if (top_of_kernel_tree('.')) {
 120                         $root = '.';
 121                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 122                                                 top_of_kernel_tree($1)) {
 123                         $root = $1;
 124                 }
 125         }
 126
 127         if (!defined $root) {
 128                 print "Must be run from the top-level dir. of a kernel tree\n";
 129                 exit(2);
 130         }
 131 }
 132
 133 my $emitted_corrupt = 0;
 134
 135 our $Ident      = qr{
 136                         [A-Za-z_][A-Za-z\d_]*
 137                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 138                 }x;
 139 our $Storage    = qr{extern|static|asmlinkage};
 140 our $Sparse     = qr{
 141                         __user|
 142                         __kernel|
 143                         __force|
 144                         __iomem|
 145                         __must_check|
 146                         __init_refok|
 147                         __kprobes|
 148                         __ref
 149                 }x;
 150
 151 # Notes to $Attribute:
 152 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 153 our $Attribute  = qr{
 154                         const|
 155                         __percpu|
 156                         __nocast|
 157                         __safe|
 158                         __bitwise__|
 159                         __packed__|
 160                         __packed2__|
 161                         __naked|
 162                         __maybe_unused|
 163                         __always_unused|
 164                         __noreturn|
 165                         __used|
 166                         __cold|
 167                         __noclone|
 168                         __deprecated|
 169                         __read_mostly|
 170                         __kprobes|
 171                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 172                         ____cacheline_aligned|
 173                         ____cacheline_aligned_in_smp|
 174                         ____cacheline_internodealigned_in_smp|
 175                         __weak
 176                   }x;
 177 our $Modifier;
 178 our $Inline     = qr{inline|__always_inline|noinline};
 179 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 180 our $Lval       = qr{$Ident(?:$Member)*};
 181
 182 our $Constant   = qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
 183 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 184 our $Compare    = qr{<=|>=|==|!=|<|>};
 185 our $Operators  = qr{
 186                         <=|>=|==|!=|
 187                         =>|->|<<|>>|<|>|!|~|
 188                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 189                   }x;
 190
 191 our $NonptrType;
 192 our $Type;
 193 our $Declare;
 194
 195 our $UTF8       = qr {
 196         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 197         | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
 198         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 199         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 200         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 201         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 202         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 203         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 204 }x;
 205
 206 our $typeTypedefs = qr{(?x:
 207         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 208         atomic_t
 209 )};
 210
 211 our $logFunctions = qr{(?x:
 212         printk|
 213         pr_(debug|dbg|vdbg|devel|info|warning|err|notice|alert|crit|emerg|cont)|
 214         (dev|netdev|netif)_(printk|dbg|vdbg|info|warn|err|notice|alert|crit|emerg|WARN)|
 215         WARN|
 216         panic
 217 )};
 218
 219 our @typeList = (
 220         qr{void},
 221         qr{(?:unsigned\s+)?char},
 222         qr{(?:unsigned\s+)?short},
 223         qr{(?:unsigned\s+)?int},
 224         qr{(?:unsigned\s+)?long},
 225         qr{(?:unsigned\s+)?long\s+int},
 226         qr{(?:unsigned\s+)?long\s+long},
 227         qr{(?:unsigned\s+)?long\s+long\s+int},
 228         qr{unsigned},
 229         qr{float},
 230         qr{double},
 231         qr{bool},
 232         qr{struct\s+$Ident},
 233         qr{union\s+$Ident},
 234         qr{enum\s+$Ident},
 235         qr{${Ident}_t},
 236         qr{${Ident}_handler},
 237         qr{${Ident}_handler_fn},
 238 );
 239 our @modifierList = (
 240         qr{fastcall},
 241 );
 242
 243 our $allowed_asm_includes = qr{(?x:
 244         irq|
 245         memory
 246 )};
 247 # memory.h: ARM has a custom one
 248
 249 sub build_types {
 250         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 251         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 252         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 253         $NonptrType     = qr{
 254                         (?:$Modifier\s+|const\s+)*
 255                         (?:
 256                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
 257                                 (?:$typeTypedefs\b)|
 258                                 (?:${all}\b)
 259                         )
 260                         (?:\s+$Modifier|\s+const)*
 261                   }x;
 262         $Type   = qr{
 263                         $NonptrType
 264                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
 265                         (?:\s+$Inline|\s+$Modifier)*
 266                   }x;
 267         $Declare        = qr{(?:$Storage\s+)?$Type};
 268 }
 269 build_types();
 270
 271 $chk_signoff = 0 if ($file);
 272
 273 my @dep_includes = ();
 274 my @dep_functions = ();
 275 my $removal = "Documentation/feature-removal-schedule.txt";
 276 if ($tree && -f "$root/$removal") {
 277         open(my $REMOVE, '<', "$root/$removal") ||
 278                                 die "$P: $removal: open failed - $!\n";
 279         while (<$REMOVE>) {
 280                 if (/^Check:\s+(.*\S)/) {
 281                         for my $entry (split(/[, ]+/, $1)) {
 282                                 if ($entry =~ m@include/(.*)@) {
 283                                         push(@dep_includes, $1);
 284
 285                                 } elsif ($entry !~ m@/@) {
 286                                         push(@dep_functions, $entry);
 287                                 }
 288                         }
 289                 }
 290         }
 291         close($REMOVE);
 292 }
 293
 294 my @rawlines = ();
 295 my @lines = ();
 296 my $vname;
 297 for my $filename (@ARGV) {
 298         my $FILE;
 299         if ($file) {
 300                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 301                         die "$P: $filename: diff failed - $!\n";
 302         } elsif ($filename eq '-') {
 303                 open($FILE, '<&STDIN');
 304         } else {
 305                 open($FILE, '<', "$filename") ||
 306                         die "$P: $filename: open failed - $!\n";
 307         }
 308         if ($filename eq '-') {
 309                 $vname = 'Your patch';
 310         } else {
 311                 $vname = $filename;
 312         }
 313         while (<$FILE>) {
 314                 chomp;
 315                 push(@rawlines, $_);
 316         }
 317         close($FILE);
 318         if (!process($filename)) {
 319                 $exit = 1;
 320         }
 321         @rawlines = ();
 322         @lines = ();
 323 }
 324
 325 exit($exit);
 326
 327 sub top_of_kernel_tree {
 328         my ($root) = @_;
 329
 330         my @tree_check = (
 331                 "COPYING", "MAINTAINERS", "Makefile",
 332                 "README", "docs", "VERSION",
 333                 "vl.c"
 334         );
 335
 336         foreach my $check (@tree_check) {
 337                 if (! -e $root . '/' . $check) {
 338                         return 0;
 339                 }
 340         }
 341         return 1;
 342 }
 343
 344 sub expand_tabs {
 345         my ($str) = @_;
 346
 347         my $res = '';
 348         my $n = 0;
 349         for my $c (split(//, $str)) {
 350                 if ($c eq "\t") {
 351                         $res .= ' ';
 352                         $n++;
 353                         for (; ($n % 8) != 0; $n++) {
 354                                 $res .= ' ';
 355                         }
 356                         next;
 357                 }
 358                 $res .= $c;
 359                 $n++;
 360         }
 361
 362         return $res;
 363 }
 364 sub copy_spacing {
 365         (my $res = shift) =~ tr/\t/ /c;
 366         return $res;
 367 }
 368
 369 sub line_stats {
 370         my ($line) = @_;
 371
 372         # Drop the diff line leader and expand tabs
 373         $line =~ s/^.//;
 374         $line = expand_tabs($line);
 375
 376         # Pick the indent from the front of the line.
 377         my ($white) = ($line =~ /^(\s*)/);
 378
 379         return (length($line), length($white));
 380 }
 381
 382 my $sanitise_quote = '';
 383
 384 sub sanitise_line_reset {
 385         my ($in_comment) = @_;
 386
 387         if ($in_comment) {
 388                 $sanitise_quote = '*/';
 389         } else {
 390                 $sanitise_quote = '';
 391         }
 392 }
 393 sub sanitise_line {
 394         my ($line) = @_;
 395
 396         my $res = '';
 397         my $l = '';
 398
 399         my $qlen = 0;
 400         my $off = 0;
 401         my $c;
 402
 403         # Always copy over the diff marker.
 404         $res = substr($line, 0, 1);
 405
 406         for ($off = 1; $off < length($line); $off++) {
 407                 $c = substr($line, $off, 1);
 408
 409                 # Comments we are wacking completly including the begin
 410                 # and end, all to $;.
 411                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 412                         $sanitise_quote = '*/';
 413
 414                         substr($res, $off, 2, "$;$;");
 415                         $off++;
 416                         next;
 417                 }
 418                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 419                         $sanitise_quote = '';
 420                         substr($res, $off, 2, "$;$;");
 421                         $off++;
 422                         next;
 423                 }
 424                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 425                         $sanitise_quote = '//';
 426
 427                         substr($res, $off, 2, $sanitise_quote);
 428                         $off++;
 429                         next;
 430                 }
 431
 432                 # A \ in a string means ignore the next character.
 433                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 434                     $c eq "\\") {
 435                         substr($res, $off, 2, 'XX');
 436                         $off++;
 437                         next;
 438                 }
 439                 # Regular quotes.
 440                 if ($c eq "'" || $c eq '"') {
 441                         if ($sanitise_quote eq '') {
 442                                 $sanitise_quote = $c;
 443
 444                                 substr($res, $off, 1, $c);
 445                                 next;
 446                         } elsif ($sanitise_quote eq $c) {
 447                                 $sanitise_quote = '';
 448                         }
 449                 }
 450
 451                 #print "c<$c> SQ<$sanitise_quote>\n";
 452                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 453                         substr($res, $off, 1, $;);
 454                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 455                         substr($res, $off, 1, $;);
 456                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 457                         substr($res, $off, 1, 'X');
 458                 } else {
 459                         substr($res, $off, 1, $c);
 460                 }
 461         }
 462
 463         if ($sanitise_quote eq '//') {
 464                 $sanitise_quote = '';
 465         }
 466
 467         # The pathname on a #include may be surrounded by '<' and '>'.
 468         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 469                 my $clean = 'X' x length($1);
 470                 $res =~ s@\<.*\>@<$clean>@;
 471
 472         # The whole of a #error is a string.
 473         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 474                 my $clean = 'X' x length($1);
 475                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 476         }
 477
 478         return $res;
 479 }
 480
 481 sub ctx_statement_block {
 482         my ($linenr, $remain, $off) = @_;
 483         my $line = $linenr - 1;
 484         my $blk = '';
 485         my $soff = $off;
 486         my $coff = $off - 1;
 487         my $coff_set = 0;
 488
 489         my $loff = 0;
 490
 491         my $type = '';
 492         my $level = 0;
 493         my @stack = ();
 494         my $p;
 495         my $c;
 496         my $len = 0;
 497
 498         my $remainder;
 499         while (1) {
 500                 @stack = (['', 0]) if ($#stack == -1);
 501
 502                 #warn "CSB: blk<$blk> remain<$remain>\n";
 503                 # If we are about to drop off the end, pull in more
 504                 # context.
 505                 if ($off >= $len) {
 506                         for (; $remain > 0; $line++) {
 507                                 last if (!defined $lines[$line]);
 508                                 next if ($lines[$line] =~ /^-/);
 509                                 $remain--;
 510                                 $loff = $len;
 511                                 $blk .= $lines[$line] . "\n";
 512                                 $len = length($blk);
 513                                 $line++;
 514                                 last;
 515                         }
 516                         # Bail if there is no further context.
 517                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 518                         if ($off >= $len) {
 519                                 last;
 520                         }
 521                 }
 522                 $p = $c;
 523                 $c = substr($blk, $off, 1);
 524                 $remainder = substr($blk, $off);
 525
 526                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 527
 528                 # Handle nested #if/#else.
 529                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 530                         push(@stack, [ $type, $level ]);
 531                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 532                         ($type, $level) = @{$stack[$#stack - 1]};
 533                 } elsif ($remainder =~ /^#\s*endif\b/) {
 534                         ($type, $level) = @{pop(@stack)};
 535                 }
 536
 537                 # Statement ends at the ';' or a close '}' at the
 538                 # outermost level.
 539                 if ($level == 0 && $c eq ';') {
 540                         last;
 541                 }
 542
 543                 # An else is really a conditional as long as its not else if
 544                 if ($level == 0 && $coff_set == 0 &&
 545                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 546                                 $remainder =~ /^(else)(?:\s|{)/ &&
 547                                 $remainder !~ /^else\s+if\b/) {
 548                         $coff = $off + length($1) - 1;
 549                         $coff_set = 1;
 550                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 551                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 552                 }
 553
 554                 if (($type eq '' || $type eq '(') && $c eq '(') {
 555                         $level++;
 556                         $type = '(';
 557                 }
 558                 if ($type eq '(' && $c eq ')') {
 559                         $level--;
 560                         $type = ($level != 0)? '(' : '';
 561
 562                         if ($level == 0 && $coff < $soff) {
 563                                 $coff = $off;
 564                                 $coff_set = 1;
 565                                 #warn "CSB: mark coff<$coff>\n";
 566                         }
 567                 }
 568                 if (($type eq '' || $type eq '{') && $c eq '{') {
 569                         $level++;
 570                         $type = '{';
 571                 }
 572                 if ($type eq '{' && $c eq '}') {
 573                         $level--;
 574                         $type = ($level != 0)? '{' : '';
 575
 576                         if ($level == 0) {
 577                                 if (substr($blk, $off + 1, 1) eq ';') {
 578                                         $off++;
 579                                 }
 580                                 last;
 581                         }
 582                 }
 583                 $off++;
 584         }
 585         # We are truly at the end, so shuffle to the next line.
 586         if ($off == $len) {
 587                 $loff = $len + 1;
 588                 $line++;
 589                 $remain--;
 590         }
 591
 592         my $statement = substr($blk, $soff, $off - $soff + 1);
 593         my $condition = substr($blk, $soff, $coff - $soff + 1);
 594
 595         #warn "STATEMENT<$statement>\n";
 596         #warn "CONDITION<$condition>\n";
 597
 598         #print "coff<$coff> soff<$off> loff<$loff>\n";
 599
 600         return ($statement, $condition,
 601                         $line, $remain + 1, $off - $loff + 1, $level);
 602 }
 603
 604 sub statement_lines {
 605         my ($stmt) = @_;
 606
 607         # Strip the diff line prefixes and rip blank lines at start and end.
 608         $stmt =~ s/(^|\n)./$1/g;
 609         $stmt =~ s/^\s*//;
 610         $stmt =~ s/\s*$//;
 611
 612         my @stmt_lines = ($stmt =~ /\n/g);
 613
 614         return $#stmt_lines + 2;
 615 }
 616
 617 sub statement_rawlines {
 618         my ($stmt) = @_;
 619
 620         my @stmt_lines = ($stmt =~ /\n/g);
 621
 622         return $#stmt_lines + 2;
 623 }
 624
 625 sub statement_block_size {
 626         my ($stmt) = @_;
 627
 628         $stmt =~ s/(^|\n)./$1/g;
 629         $stmt =~ s/^\s*{//;
 630         $stmt =~ s/}\s*$//;
 631         $stmt =~ s/^\s*//;
 632         $stmt =~ s/\s*$//;
 633
 634         my @stmt_lines = ($stmt =~ /\n/g);
 635         my @stmt_statements = ($stmt =~ /;/g);
 636
 637         my $stmt_lines = $#stmt_lines + 2;
 638         my $stmt_statements = $#stmt_statements + 1;
 639
 640         if ($stmt_lines > $stmt_statements) {
 641                 return $stmt_lines;
 642         } else {
 643                 return $stmt_statements;
 644         }
 645 }
 646
 647 sub ctx_statement_full {
 648         my ($linenr, $remain, $off) = @_;
 649         my ($statement, $condition, $level);
 650
 651         my (@chunks);
 652
 653         # Grab the first conditional/block pair.
 654         ($statement, $condition, $linenr, $remain, $off, $level) =
 655                                 ctx_statement_block($linenr, $remain, $off);
 656         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 657         push(@chunks, [ $condition, $statement ]);
 658         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 659                 return ($level, $linenr, @chunks);
 660         }
 661
 662         # Pull in the following conditional/block pairs and see if they
 663         # could continue the statement.
 664         for (;;) {
 665                 ($statement, $condition, $linenr, $remain, $off, $level) =
 666                                 ctx_statement_block($linenr, $remain, $off);
 667                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 668                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 669                 #print "C: push\n";
 670                 push(@chunks, [ $condition, $statement ]);
 671         }
 672
 673         return ($level, $linenr, @chunks);
 674 }
 675
 676 sub ctx_block_get {
 677         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 678         my $line;
 679         my $start = $linenr - 1;
 680         my $blk = '';
 681         my @o;
 682         my @c;
 683         my @res = ();
 684
 685         my $level = 0;
 686         my @stack = ($level);
 687         for ($line = $start; $remain > 0; $line++) {
 688                 next if ($rawlines[$line] =~ /^-/);
 689                 $remain--;
 690
 691                 $blk .= $rawlines[$line];
 692
 693                 # Handle nested #if/#else.
 694                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 695                         push(@stack, $level);
 696                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 697                         $level = $stack[$#stack - 1];
 698                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 699                         $level = pop(@stack);
 700                 }
 701
 702                 foreach my $c (split(//, $lines[$line])) {
 703                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 704                         if ($off > 0) {
 705                                 $off--;
 706                                 next;
 707                         }
 708
 709                         if ($c eq $close && $level > 0) {
 710                                 $level--;
 711                                 last if ($level == 0);
 712                         } elsif ($c eq $open) {
 713                                 $level++;
 714                         }
 715                 }
 716
 717                 if (!$outer || $level <= 1) {
 718                         push(@res, $rawlines[$line]);
 719                 }
 720
 721                 last if ($level == 0);
 722         }
 723
 724         return ($level, @res);
 725 }
 726 sub ctx_block_outer {
 727         my ($linenr, $remain) = @_;
 728
 729         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 730         return @r;
 731 }
 732 sub ctx_block {
 733         my ($linenr, $remain) = @_;
 734
 735         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 736         return @r;
 737 }
 738 sub ctx_statement {
 739         my ($linenr, $remain, $off) = @_;
 740
 741         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 742         return @r;
 743 }
 744 sub ctx_block_level {
 745         my ($linenr, $remain) = @_;
 746
 747         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 748 }
 749 sub ctx_statement_level {
 750         my ($linenr, $remain, $off) = @_;
 751
 752         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 753 }
 754
 755 sub ctx_locate_comment {
 756         my ($first_line, $end_line) = @_;
 757
 758         # Catch a comment on the end of the line itself.
 759         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 760         return $current_comment if (defined $current_comment);
 761
 762         # Look through the context and try and figure out if there is a
 763         # comment.
 764         my $in_comment = 0;
 765         $current_comment = '';
 766         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 767                 my $line = $rawlines[$linenr - 1];
 768                 #warn "           $line\n";
 769                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 770                         $in_comment = 1;
 771                 }
 772                 if ($line =~ m@/\*@) {
 773                         $in_comment = 1;
 774                 }
 775                 if (!$in_comment && $current_comment ne '') {
 776                         $current_comment = '';
 777                 }
 778                 $current_comment .= $line . "\n" if ($in_comment);
 779                 if ($line =~ m@\*/@) {
 780                         $in_comment = 0;
 781                 }
 782         }
 783
 784         chomp($current_comment);
 785         return($current_comment);
 786 }
 787 sub ctx_has_comment {
 788         my ($first_line, $end_line) = @_;
 789         my $cmt = ctx_locate_comment($first_line, $end_line);
 790
 791         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 792         ##print "CMMT: $cmt\n";
 793
 794         return ($cmt ne '');
 795 }
 796
 797 sub raw_line {
 798         my ($linenr, $cnt) = @_;
 799
 800         my $offset = $linenr - 1;
 801         $cnt++;
 802
 803         my $line;
 804         while ($cnt) {
 805                 $line = $rawlines[$offset++];
 806                 next if (defined($line) && $line =~ /^-/);
 807                 $cnt--;
 808         }
 809
 810         return $line;
 811 }
 812
 813 sub cat_vet {
 814         my ($vet) = @_;
 815         my ($res, $coded);
 816
 817         $res = '';
 818         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 819                 $res .= $1;
 820                 if ($2 ne '') {
 821                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 822                         $res .= $coded;
 823                 }
 824         }
 825         $res =~ s/$/\$/;
 826
 827         return $res;
 828 }
 829
 830 my $av_preprocessor = 0;
 831 my $av_pending;
 832 my @av_paren_type;
 833 my $av_pend_colon;
 834
 835 sub annotate_reset {
 836         $av_preprocessor = 0;
 837         $av_pending = '_';
 838         @av_paren_type = ('E');
 839         $av_pend_colon = 'O';
 840 }
 841
 842 sub annotate_values {
 843         my ($stream, $type) = @_;
 844
 845         my $res;
 846         my $var = '_' x length($stream);
 847         my $cur = $stream;
 848
 849         print "$stream\n" if ($dbg_values > 1);
 850
 851         while (length($cur)) {
 852                 @av_paren_type = ('E') if ($#av_paren_type < 0);
 853                 print " <" . join('', @av_paren_type) .
 854                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
 855                 if ($cur =~ /^(\s+)/o) {
 856                         print "WS($1)\n" if ($dbg_values > 1);
 857                         if ($1 =~ /\n/ && $av_preprocessor) {
 858                                 $type = pop(@av_paren_type);
 859                                 $av_preprocessor = 0;
 860                         }
 861
 862                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/) {
 863                         print "CAST($1)\n" if ($dbg_values > 1);
 864                         push(@av_paren_type, $type);
 865                         $type = 'C';
 866
 867                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
 868                         print "DECLARE($1)\n" if ($dbg_values > 1);
 869                         $type = 'T';
 870
 871                 } elsif ($cur =~ /^($Modifier)\s*/) {
 872                         print "MODIFIER($1)\n" if ($dbg_values > 1);
 873                         $type = 'T';
 874
 875                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
 876                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
 877                         $av_preprocessor = 1;
 878                         push(@av_paren_type, $type);
 879                         if ($2 ne '') {
 880                                 $av_pending = 'N';
 881                         }
 882                         $type = 'E';
 883
 884                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
 885                         print "UNDEF($1)\n" if ($dbg_values > 1);
 886                         $av_preprocessor = 1;
 887                         push(@av_paren_type, $type);
 888
 889                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
 890                         print "PRE_START($1)\n" if ($dbg_values > 1);
 891                         $av_preprocessor = 1;
 892
 893                         push(@av_paren_type, $type);
 894                         push(@av_paren_type, $type);
 895                         $type = 'E';
 896
 897                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
 898                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
 899                         $av_preprocessor = 1;
 900
 901                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
 902
 903                         $type = 'E';
 904
 905                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
 906                         print "PRE_END($1)\n" if ($dbg_values > 1);
 907
 908                         $av_preprocessor = 1;
 909
 910                         # Assume all arms of the conditional end as this
 911                         # one does, and continue as if the #endif was not here.
 912                         pop(@av_paren_type);
 913                         push(@av_paren_type, $type);
 914                         $type = 'E';
 915
 916                 } elsif ($cur =~ /^(\\\n)/o) {
 917                         print "PRECONT($1)\n" if ($dbg_values > 1);
 918
 919                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
 920                         print "ATTR($1)\n" if ($dbg_values > 1);
 921                         $av_pending = $type;
 922                         $type = 'N';
 923
 924                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
 925                         print "SIZEOF($1)\n" if ($dbg_values > 1);
 926                         if (defined $2) {
 927                                 $av_pending = 'V';
 928                         }
 929                         $type = 'N';
 930
 931                 } elsif ($cur =~ /^(if|while|for)\b/o) {
 932                         print "COND($1)\n" if ($dbg_values > 1);
 933                         $av_pending = 'E';
 934                         $type = 'N';
 935
 936                 } elsif ($cur =~/^(case)/o) {
 937                         print "CASE($1)\n" if ($dbg_values > 1);
 938                         $av_pend_colon = 'C';
 939                         $type = 'N';
 940
 941                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
 942                         print "KEYWORD($1)\n" if ($dbg_values > 1);
 943                         $type = 'N';
 944
 945                 } elsif ($cur =~ /^(\()/o) {
 946                         print "PAREN('$1')\n" if ($dbg_values > 1);
 947                         push(@av_paren_type, $av_pending);
 948                         $av_pending = '_';
 949                         $type = 'N';
 950
 951                 } elsif ($cur =~ /^(\))/o) {
 952                         my $new_type = pop(@av_paren_type);
 953                         if ($new_type ne '_') {
 954                                 $type = $new_type;
 955                                 print "PAREN('$1') -> $type\n"
 956                                                         if ($dbg_values > 1);
 957                         } else {
 958                                 print "PAREN('$1')\n" if ($dbg_values > 1);
 959                         }
 960
 961                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
 962                         print "FUNC($1)\n" if ($dbg_values > 1);
 963                         $type = 'V';
 964                         $av_pending = 'V';
 965
 966                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
 967                         if (defined $2 && $type eq 'C' || $type eq 'T') {
 968                                 $av_pend_colon = 'B';
 969                         } elsif ($type eq 'E') {
 970                                 $av_pend_colon = 'L';
 971                         }
 972                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
 973                         $type = 'V';
 974
 975                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
 976                         print "IDENT($1)\n" if ($dbg_values > 1);
 977                         $type = 'V';
 978
 979                 } elsif ($cur =~ /^($Assignment)/o) {
 980                         print "ASSIGN($1)\n" if ($dbg_values > 1);
 981                         $type = 'N';
 982
 983                 } elsif ($cur =~/^(;|{|})/) {
 984                         print "END($1)\n" if ($dbg_values > 1);
 985                         $type = 'E';
 986                         $av_pend_colon = 'O';
 987
 988                 } elsif ($cur =~/^(,)/) {
 989                         print "COMMA($1)\n" if ($dbg_values > 1);
 990                         $type = 'C';
 991
 992                 } elsif ($cur =~ /^(\?)/o) {
 993                         print "QUESTION($1)\n" if ($dbg_values > 1);
 994                         $type = 'N';
 995
 996                 } elsif ($cur =~ /^(:)/o) {
 997                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
 998
 999                         substr($var, length($res), 1, $av_pend_colon);
1000                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1001                                 $type = 'E';
1002                         } else {
1003                                 $type = 'N';
1004                         }
1005                         $av_pend_colon = 'O';
1006
1007                 } elsif ($cur =~ /^(\[)/o) {
1008                         print "CLOSE($1)\n" if ($dbg_values > 1);
1009                         $type = 'N';
1010
1011                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1012                         my $variant;
1013
1014                         print "OPV($1)\n" if ($dbg_values > 1);
1015                         if ($type eq 'V') {
1016                                 $variant = 'B';
1017                         } else {
1018                                 $variant = 'U';
1019                         }
1020
1021                         substr($var, length($res), 1, $variant);
1022                         $type = 'N';
1023
1024                 } elsif ($cur =~ /^($Operators)/o) {
1025                         print "OP($1)\n" if ($dbg_values > 1);
1026                         if ($1 ne '++' && $1 ne '--') {
1027                                 $type = 'N';
1028                         }
1029
1030                 } elsif ($cur =~ /(^.)/o) {
1031                         print "C($1)\n" if ($dbg_values > 1);
1032                 }
1033                 if (defined $1) {
1034                         $cur = substr($cur, length($1));
1035                         $res .= $type x length($1);
1036                 }
1037         }
1038
1039         return ($res, $var);
1040 }
1041
1042 sub possible {
1043         my ($possible, $line) = @_;
1044         my $notPermitted = qr{(?:
1045                 ^(?:
1046                         $Modifier|
1047                         $Storage|
1048                         $Type|
1049                         DEFINE_\S+
1050                 )$|
1051                 ^(?:
1052                         goto|
1053                         return|
1054                         case|
1055                         else|
1056                         asm|__asm__|
1057                         do
1058                 )(?:\s|$)|
1059                 ^(?:typedef|struct|enum)\b
1060             )}x;
1061         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1062         if ($possible !~ $notPermitted) {
1063                 # Check for modifiers.
1064                 $possible =~ s/\s*$Storage\s*//g;
1065                 $possible =~ s/\s*$Sparse\s*//g;
1066                 if ($possible =~ /^\s*$/) {
1067
1068                 } elsif ($possible =~ /\s/) {
1069                         $possible =~ s/\s*$Type\s*//g;
1070                         for my $modifier (split(' ', $possible)) {
1071                                 if ($modifier !~ $notPermitted) {
1072                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1073                                         push(@modifierList, $modifier);
1074                                 }
1075                         }
1076
1077                 } else {
1078                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1079                         push(@typeList, $possible);
1080                 }
1081                 build_types();
1082         } else {
1083                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1084         }
1085 }
1086
1087 my $prefix = '';
1088
1089 sub report {
1090         if (defined $tst_only && $_[0] !~ /\Q$tst_only\E/) {
1091                 return 0;
1092         }
1093         my $line = $prefix . $_[0];
1094
1095         $line = (split('\n', $line))[0] . "\n" if ($terse);
1096
1097         push(our @report, $line);
1098
1099         return 1;
1100 }
1101 sub report_dump {
1102         our @report;
1103 }
1104 sub ERROR {
1105         if (report("ERROR: $_[0]\n")) {
1106                 our $clean = 0;
1107                 our $cnt_error++;
1108         }
1109 }
1110 sub WARN {
1111         if (report("WARNING: $_[0]\n")) {
1112                 our $clean = 0;
1113                 our $cnt_warn++;
1114         }
1115 }
1116 sub CHK {
1117         if ($check && report("CHECK: $_[0]\n")) {
1118                 our $clean = 0;
1119                 our $cnt_chk++;
1120         }
1121 }
1122
1123 sub check_absolute_file {
1124         my ($absolute, $herecurr) = @_;
1125         my $file = $absolute;
1126
1127         ##print "absolute<$absolute>\n";
1128
1129         # See if any suffix of this path is a path within the tree.
1130         while ($file =~ s@^[^/]*/@@) {
1131                 if (-f "$root/$file") {
1132                         ##print "file<$file>\n";
1133                         last;
1134                 }
1135         }
1136         if (! -f _)  {
1137                 return 0;
1138         }
1139
1140         # It is, so see if the prefix is acceptable.
1141         my $prefix = $absolute;
1142         substr($prefix, -length($file)) = '';
1143
1144         ##print "prefix<$prefix>\n";
1145         if ($prefix ne ".../") {
1146                 WARN("use relative pathname instead of absolute in changelog text\n" . $herecurr);
1147         }
1148 }
1149
1150 sub process {
1151         my $filename = shift;
1152
1153         my $linenr=0;
1154         my $prevline="";
1155         my $prevrawline="";
1156         my $stashline="";
1157         my $stashrawline="";
1158
1159         my $length;
1160         my $indent;
1161         my $previndent=0;
1162         my $stashindent=0;
1163
1164         our $clean = 1;
1165         my $signoff = 0;
1166         my $is_patch = 0;
1167
1168         our @report = ();
1169         our $cnt_lines = 0;
1170         our $cnt_error = 0;
1171         our $cnt_warn = 0;
1172         our $cnt_chk = 0;
1173
1174         # Trace the real file/line as we go.
1175         my $realfile = '';
1176         my $realline = 0;
1177         my $realcnt = 0;
1178         my $here = '';
1179         my $in_comment = 0;
1180         my $comment_edge = 0;
1181         my $first_line = 0;
1182         my $p1_prefix = '';
1183
1184         my $prev_values = 'E';
1185
1186         # suppression flags
1187         my %suppress_ifbraces;
1188         my %suppress_whiletrailers;
1189         my %suppress_export;
1190
1191         # Pre-scan the patch sanitizing the lines.
1192         # Pre-scan the patch looking for any __setup documentation.
1193         #
1194         my @setup_docs = ();
1195         my $setup_docs = 0;
1196
1197         sanitise_line_reset();
1198         my $line;
1199         foreach my $rawline (@rawlines) {
1200                 $linenr++;
1201                 $line = $rawline;
1202
1203                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1204                         $setup_docs = 0;
1205                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1206                                 $setup_docs = 1;
1207                         }
1208                         #next;
1209                 }
1210                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1211                         $realline=$1-1;
1212                         if (defined $2) {
1213                                 $realcnt=$3+1;
1214                         } else {
1215                                 $realcnt=1+1;
1216                         }
1217                         $in_comment = 0;
1218
1219                         # Guestimate if this is a continuing comment.  Run
1220                         # the context looking for a comment "edge".  If this
1221                         # edge is a close comment then we must be in a comment
1222                         # at context start.
1223                         my $edge;
1224                         my $cnt = $realcnt;
1225                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1226                                 next if (defined $rawlines[$ln - 1] &&
1227                                          $rawlines[$ln - 1] =~ /^-/);
1228                                 $cnt--;
1229                                 #print "RAW<$rawlines[$ln - 1]>\n";
1230                                 last if (!defined $rawlines[$ln - 1]);
1231                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1232                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1233                                         ($edge) = $1;
1234                                         last;
1235                                 }
1236                         }
1237                         if (defined $edge && $edge eq '*/') {
1238                                 $in_comment = 1;
1239                         }
1240
1241                         # Guestimate if this is a continuing comment.  If this
1242                         # is the start of a diff block and this line starts
1243                         # ' *' then it is very likely a comment.
1244                         if (!defined $edge &&
1245                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1246                         {
1247                                 $in_comment = 1;
1248                         }
1249
1250                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1251                         sanitise_line_reset($in_comment);
1252
1253                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1254                         # Standardise the strings and chars within the input to
1255                         # simplify matching -- only bother with positive lines.
1256                         $line = sanitise_line($rawline);
1257                 }
1258                 push(@lines, $line);
1259
1260                 if ($realcnt > 1) {
1261                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1262                 } else {
1263                         $realcnt = 0;
1264                 }
1265
1266                 #print "==>$rawline\n";
1267                 #print "-->$line\n";
1268
1269                 if ($setup_docs && $line =~ /^\+/) {
1270                         push(@setup_docs, $line);
1271                 }
1272         }
1273
1274         $prefix = '';
1275
1276         $realcnt = 0;
1277         $linenr = 0;
1278         foreach my $line (@lines) {
1279                 $linenr++;
1280
1281                 my $rawline = $rawlines[$linenr - 1];
1282
1283 #extract the line range in the file after the patch is applied
1284                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1285                         $is_patch = 1;
1286                         $first_line = $linenr + 1;
1287                         $realline=$1-1;
1288                         if (defined $2) {
1289                                 $realcnt=$3+1;
1290                         } else {
1291                                 $realcnt=1+1;
1292                         }
1293                         annotate_reset();
1294                         $prev_values = 'E';
1295
1296                         %suppress_ifbraces = ();
1297                         %suppress_whiletrailers = ();
1298                         %suppress_export = ();
1299                         next;
1300
1301 # track the line number as we move through the hunk, note that
1302 # new versions of GNU diff omit the leading space on completely
1303 # blank context lines so we need to count that too.
1304                 } elsif ($line =~ /^( |\+|$)/) {
1305                         $realline++;
1306                         $realcnt-- if ($realcnt != 0);
1307
1308                         # Measure the line length and indent.
1309                         ($length, $indent) = line_stats($rawline);
1310
1311                         # Track the previous line.
1312                         ($prevline, $stashline) = ($stashline, $line);
1313                         ($previndent, $stashindent) = ($stashindent, $indent);
1314                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1315
1316                         #warn "line<$line>\n";
1317
1318                 } elsif ($realcnt == 1) {
1319                         $realcnt--;
1320                 }
1321
1322                 my $hunk_line = ($realcnt != 0);
1323
1324 #make up the handle for any error we report on this line
1325                 $prefix = "$filename:$realline: " if ($emacs && $file);
1326                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1327
1328                 $here = "#$linenr: " if (!$file);
1329                 $here = "#$realline: " if ($file);
1330
1331                 # extract the filename as it passes
1332                 if ($line =~ /^diff --git.*?(\S+)$/) {
1333                         $realfile = $1;
1334                         $realfile =~ s@^([^/]*)/@@;
1335
1336                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1337                         $realfile = $1;
1338                         $realfile =~ s@^([^/]*)/@@;
1339
1340                         $p1_prefix = $1;
1341                         if (!$file && $tree && $p1_prefix ne '' &&
1342                             -e "$root/$p1_prefix") {
1343                                 WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1344                         }
1345
1346                         if ($realfile =~ m@^include/asm/@) {
1347                                 ERROR("do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1348                         }
1349                         next;
1350                 }
1351
1352                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1353
1354                 my $hereline = "$here\n$rawline\n";
1355                 my $herecurr = "$here\n$rawline\n";
1356                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1357
1358                 $cnt_lines++ if ($realcnt != 0);
1359
1360 # Check for incorrect file permissions
1361                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1362                         my $permhere = $here . "FILE: $realfile\n";
1363                         if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1364                                 ERROR("do not set execute permissions for source files\n" . $permhere);
1365                         }
1366                 }
1367
1368 #check the patch for a signoff:
1369                 if ($line =~ /^\s*signed-off-by:/i) {
1370                         # This is a signoff, if ugly, so do not double report.
1371                         $signoff++;
1372                         if (!($line =~ /^\s*Signed-off-by:/)) {
1373                                 WARN("Signed-off-by: is the preferred form\n" .
1374                                         $herecurr);
1375                         }
1376                         if ($line =~ /^\s*signed-off-by:\S/i) {
1377                                 WARN("space required after Signed-off-by:\n" .
1378                                         $herecurr);
1379                         }
1380                 }
1381
1382 # Check for wrappage within a valid hunk of the file
1383                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1384                         ERROR("patch seems to be corrupt (line wrapped?)\n" .
1385                                 $herecurr) if (!$emitted_corrupt++);
1386                 }
1387
1388 # Check for absolute kernel paths.
1389                 if ($tree) {
1390                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1391                                 my $file = $1;
1392
1393                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1394                                     check_absolute_file($1, $herecurr)) {
1395                                         #
1396                                 } else {
1397                                         check_absolute_file($file, $herecurr);
1398                                 }
1399                         }
1400                 }
1401
1402 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1403                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1404                     $rawline !~ m/^$UTF8*$/) {
1405                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1406
1407                         my $blank = copy_spacing($rawline);
1408                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1409                         my $hereptr = "$hereline$ptr\n";
1410
1411                         ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1412                 }
1413
1414 # ignore non-hunk lines and lines being removed
1415                 next if (!$hunk_line || $line =~ /^-/);
1416
1417 #trailing whitespace
1418                 if ($line =~ /^\+.*\015/) {
1419                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1420                         ERROR("DOS line endings\n" . $herevet);
1421
1422                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1423                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1424                         ERROR("trailing whitespace\n" . $herevet);
1425                         $rpt_cleaners = 1;
1426                 }
1427
1428 # check for Kconfig help text having a real description
1429 # Only applies when adding the entry originally, after that we do not have
1430 # sufficient context to determine whether it is indeed long enough.
1431                 if ($realfile =~ /Kconfig/ &&
1432                     $line =~ /\+\s*(?:---)?help(?:---)?$/) {
1433                         my $length = 0;
1434                         my $cnt = $realcnt;
1435                         my $ln = $linenr + 1;
1436                         my $f;
1437                         my $is_end = 0;
1438                         while ($cnt > 0 && defined $lines[$ln - 1]) {
1439                                 $f = $lines[$ln - 1];
1440                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1441                                 $is_end = $lines[$ln - 1] =~ /^\+/;
1442                                 $ln++;
1443
1444                                 next if ($f =~ /^-/);
1445                                 $f =~ s/^.//;
1446                                 $f =~ s/#.*//;
1447                                 $f =~ s/^\s+//;
1448                                 next if ($f =~ /^$/);
1449                                 if ($f =~ /^\s*config\s/) {
1450                                         $is_end = 1;
1451                                         last;
1452                                 }
1453                                 $length++;
1454                         }
1455                         WARN("please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_end && $length < 4);
1456                         #print "is_end<$is_end> length<$length>\n";
1457                 }
1458
1459 # check we are in a valid source file if not then ignore this hunk
1460                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1461
1462 #80 column limit
1463                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1464                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1465                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:,|\)\s*;)\s*$/ ||
1466                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1467                     $length > 80)
1468                 {
1469                         WARN("line over 80 characters\n" . $herecurr);
1470                 }
1471
1472 # check for spaces before a quoted newline
1473                 if ($rawline =~ /^.*\".*\s\\n/) {
1474                         WARN("unnecessary whitespace before a quoted newline\n" . $herecurr);
1475                 }
1476
1477 # check for adding lines without a newline.
1478                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1479                         WARN("adding a line without newline at end of file\n" . $herecurr);
1480                 }
1481
1482 # Blackfin: use hi/lo macros
1483                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1484                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1485                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1486                                 ERROR("use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1487                         }
1488                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1489                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1490                                 ERROR("use the HI() macro, not (... >> 16)\n" . $herevet);
1491                         }
1492                 }
1493
1494 # check we are in a valid source file C or perl if not then ignore this hunk
1495                 next if ($realfile !~ /\.(h|c|pl)$/);
1496
1497 # in QEMU, no tabs are allowed
1498                 if ($rawline =~ /^\+.*\t/) {
1499                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1500                         ERROR("code indent should never use tabs\n" . $herevet);
1501                         $rpt_cleaners = 1;
1502                 }
1503
1504 # check we are in a valid C source file if not then ignore this hunk
1505                 next if ($realfile !~ /\.(h|c)$/);
1506
1507 # check for RCS/CVS revision markers
1508                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1509                         WARN("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1510                 }
1511
1512 # Blackfin: don't use __builtin_bfin_[cs]sync
1513                 if ($line =~ /__builtin_bfin_csync/) {
1514                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1515                         ERROR("use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1516                 }
1517                 if ($line =~ /__builtin_bfin_ssync/) {
1518                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1519                         ERROR("use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1520                 }
1521
1522 # Check for potential 'bare' types
1523                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1524                     $realline_next);
1525                 if ($realcnt && $line =~ /.\s*\S/) {
1526                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1527                                 ctx_statement_block($linenr, $realcnt, 0);
1528                         $stat =~ s/\n./\n /g;
1529                         $cond =~ s/\n./\n /g;
1530
1531                         # Find the real next line.
1532                         $realline_next = $line_nr_next;
1533                         if (defined $realline_next &&
1534                             (!defined $lines[$realline_next - 1] ||
1535                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1536                                 $realline_next++;
1537                         }
1538
1539                         my $s = $stat;
1540                         $s =~ s/{.*$//s;
1541
1542                         # Ignore goto labels.
1543                         if ($s =~ /$Ident:\*$/s) {
1544
1545                         # Ignore functions being called
1546                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1547
1548                         } elsif ($s =~ /^.\s*else\b/s) {
1549
1550                         # declarations always start with types
1551                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1552                                 my $type = $1;
1553                                 $type =~ s/\s+/ /g;
1554                                 possible($type, "A:" . $s);
1555
1556                         # definitions in global scope can only start with types
1557                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1558                                 possible($1, "B:" . $s);
1559                         }
1560
1561                         # any (foo ... *) is a pointer cast, and foo is a type
1562                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1563                                 possible($1, "C:" . $s);
1564                         }
1565
1566                         # Check for any sort of function declaration.
1567                         # int foo(something bar, other baz);
1568                         # void (*store_gdt)(x86_descr_ptr *);
1569                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1570                                 my ($name_len) = length($1);
1571
1572                                 my $ctx = $s;
1573                                 substr($ctx, 0, $name_len + 1, '');
1574                                 $ctx =~ s/\)[^\)]*$//;
1575
1576                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1577                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1578
1579                                                 possible($1, "D:" . $s);
1580                                         }
1581                                 }
1582                         }
1583
1584                 }
1585
1586 #
1587 # Checks which may be anchored in the context.
1588 #
1589
1590 # Check for switch () and associated case and default
1591 # statements should be at the same indent.
1592                 if ($line=~/\bswitch\s*\(.*\)/) {
1593                         my $err = '';
1594                         my $sep = '';
1595                         my @ctx = ctx_block_outer($linenr, $realcnt);
1596                         shift(@ctx);
1597                         for my $ctx (@ctx) {
1598                                 my ($clen, $cindent) = line_stats($ctx);
1599                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1600                                                         $indent != $cindent) {
1601                                         $err .= "$sep$ctx\n";
1602                                         $sep = '';
1603                                 } else {
1604                                         $sep = "[...]\n";
1605                                 }
1606                         }
1607                         if ($err ne '') {
1608                                 ERROR("switch and case should be at the same indent\n$hereline$err");
1609                         }
1610                 }
1611
1612 # if/while/etc brace do not go on next line, unless defining a do while loop,
1613 # or if that brace on the next line is for something else
1614                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1615                         my $pre_ctx = "$1$2";
1616
1617                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1618                         my $ctx_cnt = $realcnt - $#ctx - 1;
1619                         my $ctx = join("\n", @ctx);
1620
1621                         my $ctx_ln = $linenr;
1622                         my $ctx_skip = $realcnt;
1623
1624                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1625                                         defined $lines[$ctx_ln - 1] &&
1626                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1627                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1628                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1629                                 $ctx_ln++;
1630                         }
1631
1632                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1633                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1634
1635                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
1636                                 ERROR("that open brace { should be on the previous line\n" .
1637                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1638                         }
1639                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1640                             $ctx =~ /\)\s*\;\s*$/ &&
1641                             defined $lines[$ctx_ln - 1])
1642                         {
1643                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1644                                 if ($nindent > $indent) {
1645                                         WARN("trailing semicolon indicates no statements, indent implies otherwise\n" .
1646                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1647                                 }
1648                         }
1649                 }
1650
1651 # Check relative indent for conditionals and blocks.
1652                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1653                         my ($s, $c) = ($stat, $cond);
1654
1655                         substr($s, 0, length($c), '');
1656
1657                         # Make sure we remove the line prefixes as we have
1658                         # none on the first line, and are going to readd them
1659                         # where necessary.
1660                         $s =~ s/\n./\n/gs;
1661
1662                         # Find out how long the conditional actually is.
1663                         my @newlines = ($c =~ /\n/gs);
1664                         my $cond_lines = 1 + $#newlines;
1665
1666                         # We want to check the first line inside the block
1667                         # starting at the end of the conditional, so remove:
1668                         #  1) any blank line termination
1669                         #  2) any opening brace { on end of the line
1670                         #  3) any do (...) {
1671                         my $continuation = 0;
1672                         my $check = 0;
1673                         $s =~ s/^.*\bdo\b//;
1674                         $s =~ s/^\s*{//;
1675                         if ($s =~ s/^\s*\\//) {
1676                                 $continuation = 1;
1677                         }
1678                         if ($s =~ s/^\s*?\n//) {
1679                                 $check = 1;
1680                                 $cond_lines++;
1681                         }
1682
1683                         # Also ignore a loop construct at the end of a
1684                         # preprocessor statement.
1685                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1686                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1687                                 $check = 0;
1688                         }
1689
1690                         my $cond_ptr = -1;
1691                         $continuation = 0;
1692                         while ($cond_ptr != $cond_lines) {
1693                                 $cond_ptr = $cond_lines;
1694
1695                                 # If we see an #else/#elif then the code
1696                                 # is not linear.
1697                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1698                                         $check = 0;
1699                                 }
1700
1701                                 # Ignore:
1702                                 #  1) blank lines, they should be at 0,
1703                                 #  2) preprocessor lines, and
1704                                 #  3) labels.
1705                                 if ($continuation ||
1706                                     $s =~ /^\s*?\n/ ||
1707                                     $s =~ /^\s*#\s*?/ ||
1708                                     $s =~ /^\s*$Ident\s*:/) {
1709                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1710                                         if ($s =~ s/^.*?\n//) {
1711                                                 $cond_lines++;
1712                                         }
1713                                 }
1714                         }
1715
1716                         my (undef, $sindent) = line_stats("+" . $s);
1717                         my $stat_real = raw_line($linenr, $cond_lines);
1718
1719                         # Check if either of these lines are modified, else
1720                         # this is not this patch's fault.
1721                         if (!defined($stat_real) ||
1722                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1723                                 $check = 0;
1724                         }
1725                         if (defined($stat_real) && $cond_lines > 1) {
1726                                 $stat_real = "[...]\n$stat_real";
1727                         }
1728
1729                         #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";
1730
1731                         if ($check && (($sindent % 4) != 0 ||
1732                             ($sindent <= $indent && $s ne ''))) {
1733                                 WARN("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1734                         }
1735                 }
1736
1737                 # Track the 'values' across context and added lines.
1738                 my $opline = $line; $opline =~ s/^./ /;
1739                 my ($curr_values, $curr_vars) =
1740                                 annotate_values($opline . "\n", $prev_values);
1741                 $curr_values = $prev_values . $curr_values;
1742                 if ($dbg_values) {
1743                         my $outline = $opline; $outline =~ s/\t/ /g;
1744                         print "$linenr > .$outline\n";
1745                         print "$linenr > $curr_values\n";
1746                         print "$linenr >  $curr_vars\n";
1747                 }
1748                 $prev_values = substr($curr_values, -1);
1749
1750 #ignore lines not being added
1751                 if ($line=~/^[^\+]/) {next;}
1752
1753 # TEST: allow direct testing of the type matcher.
1754                 if ($dbg_type) {
1755                         if ($line =~ /^.\s*$Declare\s*$/) {
1756                                 ERROR("TEST: is type\n" . $herecurr);
1757                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1758                                 ERROR("TEST: is not type ($1 is)\n". $herecurr);
1759                         }
1760                         next;
1761                 }
1762 # TEST: allow direct testing of the attribute matcher.
1763                 if ($dbg_attr) {
1764                         if ($line =~ /^.\s*$Modifier\s*$/) {
1765                                 ERROR("TEST: is attr\n" . $herecurr);
1766                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1767                                 ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1768                         }
1769                         next;
1770                 }
1771
1772 # check for initialisation to aggregates open brace on the next line
1773                 if ($line =~ /^.\s*{/ &&
1774                     $prevline =~ /(?:^|[^=])=\s*$/) {
1775                         ERROR("that open brace { should be on the previous line\n" . $hereprev);
1776                 }
1777
1778 #
1779 # Checks which are anchored on the added line.
1780 #
1781
1782 # check for malformed paths in #include statements (uses RAW line)
1783                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1784                         my $path = $1;
1785                         if ($path =~ m{//}) {
1786                                 ERROR("malformed #include filename\n" .
1787                                         $herecurr);
1788                         }
1789                 }
1790
1791 # no C99 // comments
1792                 if ($line =~ m{//}) {
1793                         ERROR("do not use C99 // comments\n" . $herecurr);
1794                 }
1795                 # Remove C99 comments.
1796                 $line =~ s@//.*@@;
1797                 $opline =~ s@//.*@@;
1798
1799 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
1800 # the whole statement.
1801 #print "APW <$lines[$realline_next - 1]>\n";
1802                 if (defined $realline_next &&
1803                     exists $lines[$realline_next - 1] &&
1804                     !defined $suppress_export{$realline_next} &&
1805                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
1806                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
1807                         # Handle definitions which produce identifiers with
1808                         # a prefix:
1809                         #   XXX(foo);
1810                         #   EXPORT_SYMBOL(something_foo);
1811                         my $name = $1;
1812                         if ($stat =~ /^.([A-Z_]+)\s*\(\s*($Ident)/ &&
1813                             $name =~ /^${Ident}_$2/) {
1814 #print "FOO C name<$name>\n";
1815                                 $suppress_export{$realline_next} = 1;
1816
1817                         } elsif ($stat !~ /(?:
1818                                 \n.}\s*$|
1819                                 ^.DEFINE_$Ident\(\Q$name\E\)|
1820                                 ^.DECLARE_$Ident\(\Q$name\E\)|
1821                                 ^.LIST_HEAD\(\Q$name\E\)|
1822                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
1823                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
1824                             )/x) {
1825 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
1826                                 $suppress_export{$realline_next} = 2;
1827                         } else {
1828                                 $suppress_export{$realline_next} = 1;
1829                         }
1830                 }
1831                 if (!defined $suppress_export{$linenr} &&
1832                     $prevline =~ /^.\s*$/ &&
1833                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
1834                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
1835 #print "FOO B <$lines[$linenr - 1]>\n";
1836                         $suppress_export{$linenr} = 2;
1837                 }
1838                 if (defined $suppress_export{$linenr} &&
1839                     $suppress_export{$linenr} == 2) {
1840                         WARN("EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
1841                 }
1842
1843 # check for global initialisers.
1844                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
1845                         ERROR("do not initialise globals to 0 or NULL\n" .
1846                                 $herecurr);
1847                 }
1848 # check for static initialisers.
1849                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
1850                         ERROR("do not initialise statics to 0 or NULL\n" .
1851                                 $herecurr);
1852                 }
1853
1854 # * goes on variable not on type
1855                 # (char*[ const])
1856                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1857                         my ($from, $to) = ($1, $1);
1858
1859                         # Should start with a space.
1860                         $to =~ s/^(\S)/ $1/;
1861                         # Should not end with a space.
1862                         $to =~ s/\s+$//;
1863                         # '*'s should not have spaces between.
1864                         while ($to =~ s/\*\s+\*/\*\*/) {
1865                         }
1866
1867                         #print "from<$from> to<$to>\n";
1868                         if ($from ne $to) {
1869                                 ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
1870                         }
1871                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
1872                         my ($from, $to, $ident) = ($1, $1, $2);
1873
1874                         # Should start with a space.
1875                         $to =~ s/^(\S)/ $1/;
1876                         # Should not end with a space.
1877                         $to =~ s/\s+$//;
1878                         # '*'s should not have spaces between.
1879                         while ($to =~ s/\*\s+\*/\*\*/) {
1880                         }
1881                         # Modifiers should have spaces.
1882                         $to =~ s/(\b$Modifier$)/$1 /;
1883
1884                         #print "from<$from> to<$to> ident<$ident>\n";
1885                         if ($from ne $to && $ident !~ /^$Modifier$/) {
1886                                 ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
1887                         }
1888                 }
1889
1890 # # no BUG() or BUG_ON()
1891 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
1892 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
1893 #                       print "$herecurr";
1894 #                       $clean = 0;
1895 #               }
1896
1897                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
1898                         WARN("LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
1899                 }
1900
1901 # printk should use KERN_* levels.  Note that follow on printk's on the
1902 # same line do not need a level, so we use the current block context
1903 # to try and find and validate the current printk.  In summary the current
1904 # printk includes all preceeding printk's which have no newline on the end.
1905 # we assume the first bad printk is the one to report.
1906                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
1907                         my $ok = 0;
1908                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
1909                                 #print "CHECK<$lines[$ln - 1]\n";
1910                                 # we have a preceeding printk if it ends
1911                                 # with "\n" ignore it, else it is to blame
1912                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
1913                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
1914                                                 $ok = 1;
1915                                         }
1916                                         last;
1917                                 }
1918                         }
1919                         if ($ok == 0) {
1920                                 WARN("printk() should include KERN_ facility level\n" . $herecurr);
1921                         }
1922                 }
1923
1924 # function brace can't be on same line, except for #defines of do while,
1925 # or if closed on same line
1926                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
1927                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
1928                         ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
1929                 }
1930
1931 # open braces for enum, union and struct go on the same line.
1932                 if ($line =~ /^.\s*{/ &&
1933                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
1934                         ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
1935                 }
1936
1937 # missing space after union, struct or enum definition
1938                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
1939                     WARN("missing space after $1 definition\n" . $herecurr);
1940                 }
1941
1942 # check for spacing round square brackets; allowed:
1943 #  1. with a type on the left -- int [] a;
1944 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
1945 #  3. inside a curly brace -- = { [0...10] = 5 }
1946                 while ($line =~ /(.*?\s)\[/g) {
1947                         my ($where, $prefix) = ($-[1], $1);
1948                         if ($prefix !~ /$Type\s+$/ &&
1949                             ($where != 0 || $prefix !~ /^.\s+$/) &&
1950                             $prefix !~ /{\s+$/) {
1951                                 ERROR("space prohibited before open square bracket '['\n" . $herecurr);
1952                         }
1953                 }
1954
1955 # check for spaces between functions and their parentheses.
1956                 while ($line =~ /($Ident)\s+\(/g) {
1957                         my $name = $1;
1958                         my $ctx_before = substr($line, 0, $-[1]);
1959                         my $ctx = "$ctx_before$name";
1960
1961                         # Ignore those directives where spaces _are_ permitted.
1962                         if ($name =~ /^(?:
1963                                 if|for|while|switch|return|case|
1964                                 volatile|__volatile__|
1965                                 __attribute__|format|__extension__|
1966                                 asm|__asm__)$/x)
1967                         {
1968
1969                         # cpp #define statements have non-optional spaces, ie
1970                         # if there is a space between the name and the open
1971                         # parenthesis it is simply not a parameter group.
1972                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
1973
1974                         # cpp #elif statement condition may start with a (
1975                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
1976
1977                         # If this whole things ends with a type its most
1978                         # likely a typedef for a function.
1979                         } elsif ($ctx =~ /$Type$/) {
1980
1981                         } else {
1982                                 WARN("space prohibited between function name and open parenthesis '('\n" . $herecurr);
1983                         }
1984                 }
1985 # Check operator spacing.
1986                 if (!($line=~/\#\s*include/)) {
1987                         my $ops = qr{
1988                                 <<=|>>=|<=|>=|==|!=|
1989                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
1990                                 =>|->|<<|>>|<|>|=|!|~|
1991                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
1992                                 \?|:
1993                         }x;
1994                         my @elements = split(/($ops|;)/, $opline);
1995                         my $off = 0;
1996
1997                         my $blank = copy_spacing($opline);
1998
1999                         for (my $n = 0; $n < $#elements; $n += 2) {
2000                                 $off += length($elements[$n]);
2001
2002                                 # Pick up the preceeding and succeeding characters.
2003                                 my $ca = substr($opline, 0, $off);
2004                                 my $cc = '';
2005                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2006                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2007                                 }
2008                                 my $cb = "$ca$;$cc";
2009
2010                                 my $a = '';
2011                                 $a = 'V' if ($elements[$n] ne '');
2012                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2013                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2014                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2015                                 $a = 'O' if ($elements[$n] eq '');
2016                                 $a = 'E' if ($ca =~ /^\s*$/);
2017
2018                                 my $op = $elements[$n + 1];
2019
2020                                 my $c = '';
2021                                 if (defined $elements[$n + 2]) {
2022                                         $c = 'V' if ($elements[$n + 2] ne '');
2023                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2024                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2025                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2026                                         $c = 'O' if ($elements[$n + 2] eq '');
2027                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2028                                 } else {
2029                                         $c = 'E';
2030                                 }
2031
2032                                 my $ctx = "${a}x${c}";
2033
2034                                 my $at = "(ctx:$ctx)";
2035
2036                                 my $ptr = substr($blank, 0, $off) . "^";
2037                                 my $hereptr = "$hereline$ptr\n";
2038
2039                                 # Pull out the value of this operator.
2040                                 my $op_type = substr($curr_values, $off + 1, 1);
2041
2042                                 # Get the full operator variant.
2043                                 my $opv = $op . substr($curr_vars, $off, 1);
2044
2045                                 # Ignore operators passed as parameters.
2046                                 if ($op_type ne 'V' &&
2047                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2048
2049 #                               # Ignore comments
2050 #                               } elsif ($op =~ /^$;+$/) {
2051
2052                                 # ; should have either the end of line or a space or \ after it
2053                                 } elsif ($op eq ';') {
2054                                         if ($ctx !~ /.x[WEBC]/ &&
2055                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2056                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2057                                         }
2058
2059                                 # // is a comment
2060                                 } elsif ($op eq '//') {
2061
2062                                 # No spaces for:
2063                                 #   ->
2064                                 #   :   when part of a bitfield
2065                                 } elsif ($op eq '->' || $opv eq ':B') {
2066                                         if ($ctx =~ /Wx.|.xW/) {
2067                                                 ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2068                                         }
2069
2070                                 # , must have a space on the right.
2071                                 # not required when having a single },{ on one line
2072                                 } elsif ($op eq ',') {
2073                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
2074                                             ($elements[$n] . $elements[$n + 2]) !~ " *}{") {
2075                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2076                                         }
2077
2078                                 # '*' as part of a type definition -- reported already.
2079                                 } elsif ($opv eq '*_') {
2080                                         #warn "'*' is part of type\n";
2081
2082                                 # unary operators should have a space before and
2083                                 # none after.  May be left adjacent to another
2084                                 # unary operator, or a cast
2085                                 } elsif ($op eq '!' || $op eq '~' ||
2086                                          $opv eq '*U' || $opv eq '-U' ||
2087                                          $opv eq '&U' || $opv eq '&&U') {
2088                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2089                                                 ERROR("space required before that '$op' $at\n" . $hereptr);
2090                                         }
2091                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2092                                                 # A unary '*' may be const
2093
2094                                         } elsif ($ctx =~ /.xW/) {
2095                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2096                                         }
2097
2098                                 # unary ++ and unary -- are allowed no space on one side.
2099                                 } elsif ($op eq '++' or $op eq '--') {
2100                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2101                                                 ERROR("space required one side of that '$op' $at\n" . $hereptr);
2102                                         }
2103                                         if ($ctx =~ /Wx[BE]/ ||
2104                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2105                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2106                                         }
2107                                         if ($ctx =~ /ExW/) {
2108                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2109                                         }
2110
2111
2112                                 # << and >> may either have or not have spaces both sides
2113                                 } elsif ($op eq '<<' or $op eq '>>' or
2114                                          $op eq '&' or $op eq '^' or $op eq '|' or
2115                                          $op eq '+' or $op eq '-' or
2116                                          $op eq '*' or $op eq '/' or
2117                                          $op eq '%')
2118                                 {
2119                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2120                                                 ERROR("need consistent spacing around '$op' $at\n" .
2121                                                         $hereptr);
2122                                         }
2123
2124                                 # A colon needs no spaces before when it is
2125                                 # terminating a case value or a label.
2126                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2127                                         if ($ctx =~ /Wx./) {
2128                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2129                                         }
2130
2131                                 # All the others need spaces both sides.
2132                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2133                                         my $ok = 0;
2134
2135                                         # Ignore email addresses <foo@bar>
2136                                         if (($op eq '<' &&
2137                                              $cc =~ /^\S+\@\S+>/) ||
2138                                             ($op eq '>' &&
2139                                              $ca =~ /<\S+\@\S+$/))
2140                                         {
2141                                                 $ok = 1;
2142                                         }
2143
2144                                         # Ignore ?:
2145                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2146                                             ($op eq '?' && $cc =~ /^:/)) {
2147                                                 $ok = 1;
2148                                         }
2149
2150                                         if ($ok == 0) {
2151                                                 ERROR("spaces required around that '$op' $at\n" . $hereptr);
2152                                         }
2153                                 }
2154                                 $off += length($elements[$n + 1]);
2155                         }
2156                 }
2157
2158 # check for multiple assignments
2159                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2160                         CHK("multiple assignments should be avoided\n" . $herecurr);
2161                 }
2162
2163 ## # check for multiple declarations, allowing for a function declaration
2164 ## # continuation.
2165 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2166 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2167 ##
2168 ##                      # Remove any bracketed sections to ensure we do not
2169 ##                      # falsly report the parameters of functions.
2170 ##                      my $ln = $line;
2171 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2172 ##                      }
2173 ##                      if ($ln =~ /,/) {
2174 ##                              WARN("declaring multiple variables together should be avoided\n" . $herecurr);
2175 ##                      }
2176 ##              }
2177
2178 #need space before brace following if, while, etc
2179                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2180                     $line =~ /do{/) {
2181                         ERROR("space required before the open brace '{'\n" . $herecurr);
2182                 }
2183
2184 # closing brace should have a space following it when it has anything
2185 # on the line
2186                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2187                         ERROR("space required after that close brace '}'\n" . $herecurr);
2188                 }
2189
2190 # check spacing on square brackets
2191                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2192                         ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2193                 }
2194                 if ($line =~ /\s\]/) {
2195                         ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2196                 }
2197
2198 # check spacing on parentheses
2199                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2200                     $line !~ /for\s*\(\s+;/) {
2201                         ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2202                 }
2203                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2204                     $line !~ /for\s*\(.*;\s+\)/ &&
2205                     $line !~ /:\s+\)/) {
2206                         ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2207                 }
2208
2209 #goto labels aren't indented, allow a single space however
2210                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2211                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2212                         WARN("labels should not be indented\n" . $herecurr);
2213                 }
2214
2215 # Return is not a function.
2216                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2217                         my $spacing = $1;
2218                         my $value = $2;
2219
2220                         # Flatten any parentheses
2221                         $value =~ s/\(/ \(/g;
2222                         $value =~ s/\)/\) /g;
2223                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2224                                $value !~ /(?:$Ident|-?$Constant)\s*
2225                                              $Compare\s*
2226                                              (?:$Ident|-?$Constant)/x &&
2227                                $value =~ s/\([^\(\)]*\)/1/) {
2228                         }
2229 #print "value<$value>\n";
2230                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2231                                 ERROR("return is not a function, parentheses are not required\n" . $herecurr);
2232
2233                         } elsif ($spacing !~ /\s+/) {
2234                                 ERROR("space required before the open parenthesis '('\n" . $herecurr);
2235                         }
2236                 }
2237 # Return of what appears to be an errno should normally be -'ve
2238                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2239                         my $name = $1;
2240                         if ($name ne 'EOF' && $name ne 'ERROR') {
2241                                 CHK("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2242                         }
2243                 }
2244
2245 # Need a space before open parenthesis after if, while etc
2246                 if ($line=~/\b(if|while|for|switch)\(/) {
2247                         ERROR("space required before the open parenthesis '('\n" . $herecurr);
2248                 }
2249
2250 # Check for illegal assignment in if conditional -- and check for trailing
2251 # statements after the conditional.
2252                 if ($line =~ /do\s*(?!{)/) {
2253                         my ($stat_next) = ctx_statement_block($line_nr_next,
2254                                                 $remain_next, $off_next);
2255                         $stat_next =~ s/\n./\n /g;
2256                         ##print "stat<$stat> stat_next<$stat_next>\n";
2257
2258                         if ($stat_next =~ /^\s*while\b/) {
2259                                 # If the statement carries leading newlines,
2260                                 # then count those as offsets.
2261                                 my ($whitespace) =
2262                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2263                                 my $offset =
2264                                         statement_rawlines($whitespace) - 1;
2265
2266                                 $suppress_whiletrailers{$line_nr_next +
2267                                                                 $offset} = 1;
2268                         }
2269                 }
2270                 if (!defined $suppress_whiletrailers{$linenr} &&
2271                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2272                         my ($s, $c) = ($stat, $cond);
2273
2274                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2275                                 ERROR("do not use assignment in if condition\n" . $herecurr);
2276                         }
2277
2278                         # Find out what is on the end of the line after the
2279                         # conditional.
2280                         substr($s, 0, length($c), '');
2281                         $s =~ s/\n.*//g;
2282                         $s =~ s/$;//g;  # Remove any comments
2283                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2284                             $c !~ /}\s*while\s*/)
2285                         {
2286                                 # Find out how long the conditional actually is.
2287                                 my @newlines = ($c =~ /\n/gs);
2288                                 my $cond_lines = 1 + $#newlines;
2289                                 my $stat_real = '';
2290
2291                                 $stat_real = raw_line($linenr, $cond_lines)
2292                                                         . "\n" if ($cond_lines);
2293                                 if (defined($stat_real) && $cond_lines > 1) {
2294                                         $stat_real = "[...]\n$stat_real";
2295                                 }
2296
2297                                 ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2298                         }
2299                 }
2300
2301 # Check for bitwise tests written as boolean
2302                 if ($line =~ /
2303                         (?:
2304                                 (?:\[|\(|\&\&|\|\|)
2305                                 \s*0[xX][0-9]+\s*
2306                                 (?:\&\&|\|\|)
2307                         |
2308                                 (?:\&\&|\|\|)
2309                                 \s*0[xX][0-9]+\s*
2310                                 (?:\&\&|\|\||\)|\])
2311                         )/x)
2312                 {
2313                         WARN("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2314                 }
2315
2316 # if and else should not have general statements after it
2317                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2318                         my $s = $1;
2319                         $s =~ s/$;//g;  # Remove any comments
2320                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2321                                 ERROR("trailing statements should be on next line\n" . $herecurr);
2322                         }
2323                 }
2324 # if should not continue a brace
2325                 if ($line =~ /}\s*if\b/) {
2326                         ERROR("trailing statements should be on next line\n" .
2327                                 $herecurr);
2328                 }
2329 # case and default should not have general statements after them
2330                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2331                     $line !~ /\G(?:
2332                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2333                         \s*return\s+
2334                     )/xg)
2335                 {
2336                         ERROR("trailing statements should be on next line\n" . $herecurr);
2337                 }
2338
2339                 # Check for }<nl>else {, these must be at the same
2340                 # indent level to be relevant to each other.
2341                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2342                                                 $previndent == $indent) {
2343                         ERROR("else should follow close brace '}'\n" . $hereprev);
2344                 }
2345
2346                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2347                                                 $previndent == $indent) {
2348                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2349
2350                         # Find out what is on the end of the line after the
2351                         # conditional.
2352                         substr($s, 0, length($c), '');
2353                         $s =~ s/\n.*//g;
2354
2355                         if ($s =~ /^\s*;/) {
2356                                 ERROR("while should follow close brace '}'\n" . $hereprev);
2357                         }
2358                 }
2359
2360 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2361 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2362 #                   print "No studly caps, use _\n";
2363 #                   print "$herecurr";
2364 #                   $clean = 0;
2365 #               }
2366
2367 #no spaces allowed after \ in define
2368                 if ($line=~/\#\s*define.*\\\s$/) {
2369                         WARN("Whitepspace after \\ makes next lines useless\n" . $herecurr);
2370                 }
2371
2372 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2373                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2374                         my $file = "$1.h";
2375                         my $checkfile = "include/linux/$file";
2376                         if (-f "$root/$checkfile" &&
2377                             $realfile ne $checkfile &&
2378                             $1 !~ /$allowed_asm_includes/)
2379                         {
2380                                 if ($realfile =~ m{^arch/}) {
2381                                         CHK("Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2382                                 } else {
2383                                         WARN("Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2384                                 }
2385                         }
2386                 }
2387
2388 # multi-statement macros should be enclosed in a do while loop, grab the
2389 # first statement and ensure its the whole macro if its not enclosed
2390 # in a known good container
2391                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2392                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2393                         my $ln = $linenr;
2394                         my $cnt = $realcnt;
2395                         my ($off, $dstat, $dcond, $rest);
2396                         my $ctx = '';
2397
2398                         my $args = defined($1);
2399
2400                         # Find the end of the macro and limit our statement
2401                         # search to that.
2402                         while ($cnt > 0 && defined $lines[$ln - 1] &&
2403                                 $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2404                         {
2405                                 $ctx .= $rawlines[$ln - 1] . "\n";
2406                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2407                                 $ln++;
2408                         }
2409                         $ctx .= $rawlines[$ln - 1];
2410
2411                         ($dstat, $dcond, $ln, $cnt, $off) =
2412                                 ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2413                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2414                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2415
2416                         # Extract the remainder of the define (if any) and
2417                         # rip off surrounding spaces, and trailing \'s.
2418                         $rest = '';
2419                         while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2420                                 #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2421                                 if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2422                                         $rest .= substr($lines[$ln - 1], $off) . "\n";
2423                                         $cnt--;
2424                                 }
2425                                 $ln++;
2426                                 $off = 0;
2427                         }
2428                         $rest =~ s/\\\n.//g;
2429                         $rest =~ s/^\s*//s;
2430                         $rest =~ s/\s*$//s;
2431
2432                         # Clean up the original statement.
2433                         if ($args) {
2434                                 substr($dstat, 0, length($dcond), '');
2435                         } else {
2436                                 $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2437                         }
2438                         $dstat =~ s/$;//g;
2439                         $dstat =~ s/\\\n.//g;
2440                         $dstat =~ s/^\s*//s;
2441                         $dstat =~ s/\s*$//s;
2442
2443                         # Flatten any parentheses and braces
2444                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2445                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2446                                $dstat =~ s/\[[^\{\}]*\]/1/)
2447                         {
2448                         }
2449
2450                         my $exceptions = qr{
2451                                 $Declare|
2452                                 module_param_named|
2453                                 MODULE_PARAM_DESC|
2454                                 DECLARE_PER_CPU|
2455                                 DEFINE_PER_CPU|
2456                                 __typeof__\(|
2457                                 union|
2458                                 struct|
2459                                 \.$Ident\s*=\s*|
2460                                 ^\"|\"$
2461                         }x;
2462                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2463                         if ($rest ne '' && $rest ne ',') {
2464                                 if ($rest !~ /while\s*\(/ &&
2465                                     $dstat !~ /$exceptions/)
2466                                 {
2467                                         ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2468                                 }
2469
2470                         } elsif ($ctx !~ /;/) {
2471                                 if ($dstat ne '' &&
2472                                     $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2473                                     $dstat !~ /$exceptions/ &&
2474                                     $dstat !~ /^\.$Ident\s*=/ &&
2475                                     $dstat =~ /$Operators/)
2476                                 {
2477                                         ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2478                                 }
2479                         }
2480                 }
2481
2482 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
2483 # all assignments may have only one of the following with an assignment:
2484 #       .
2485 #       ALIGN(...)
2486 #       VMLINUX_SYMBOL(...)
2487                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
2488                         WARN("vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
2489                 }
2490
2491 # check for missing bracing round if etc
2492                 if ($line =~ /(^.*)\bif\b/ && $line !~ /\#\s*if/) {
2493                         my ($level, $endln, @chunks) =
2494                                 ctx_statement_full($linenr, $realcnt, 1);
2495                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2496                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
2497                         if ($#chunks >= 0 && $level == 0) {
2498                                 my $allowed = 0;
2499                                 my $seen = 0;
2500                                 my $herectx = $here . "\n";
2501                                 my $ln = $linenr - 1;
2502                                 for my $chunk (@chunks) {
2503                                         my ($cond, $block) = @{$chunk};
2504
2505                                         # If the condition carries leading newlines, then count those as offsets.
2506                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2507                                         my $offset = statement_rawlines($whitespace) - 1;
2508
2509                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2510
2511                                         # We have looked at and allowed this specific line.
2512                                         $suppress_ifbraces{$ln + $offset} = 1;
2513
2514                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2515                                         $ln += statement_rawlines($block) - 1;
2516
2517                                         substr($block, 0, length($cond), '');
2518
2519                                         $seen++ if ($block =~ /^\s*{/);
2520
2521                                         #print "cond<$cond> block<$block> allowed<$allowed>\n";
2522                                         if (statement_lines($cond) > 1) {
2523                                                 #print "APW: ALLOWED: cond<$cond>\n";
2524                                                 $allowed = 1;
2525                                         }
2526                                         if ($block =~/\b(?:if|for|while)\b/) {
2527                                                 #print "APW: ALLOWED: block<$block>\n";
2528                                                 $allowed = 1;
2529                                         }
2530                                         if (statement_block_size($block) > 1) {
2531                                                 #print "APW: ALLOWED: lines block<$block>\n";
2532                                                 $allowed = 1;
2533                                         }
2534                                 }
2535                                 if (!$seen) {
2536                                         WARN("braces {} are necessary for all arms of this statement\n" . $herectx);
2537                                 }
2538                         }
2539                 }
2540                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2541                                         $line =~ /\b(if|while|for|else)\b/ &&
2542                                         $line !~ /\#\s*if/ &&
2543                                         $line !~ /\#\s*else/) {
2544                         my $allowed = 0;
2545
2546                         # Check the pre-context.
2547                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2548                                 #print "APW: ALLOWED: pre<$1>\n";
2549                                 $allowed = 1;
2550                         }
2551
2552                         my ($level, $endln, @chunks) =
2553                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2554
2555                         # Check the condition.
2556                         my ($cond, $block) = @{$chunks[0]};
2557                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
2558                         if (defined $cond) {
2559                                 substr($block, 0, length($cond), '');
2560                         }
2561                         if (statement_lines($cond) > 1) {
2562                                 #print "APW: ALLOWED: cond<$cond>\n";
2563                                 $allowed = 1;
2564                         }
2565                         if ($block =~/\b(?:if|for|while)\b/) {
2566                                 #print "APW: ALLOWED: block<$block>\n";
2567                                 $allowed = 1;
2568                         }
2569                         if (statement_block_size($block) > 1) {
2570                                 #print "APW: ALLOWED: lines block<$block>\n";
2571                                 $allowed = 1;
2572                         }
2573                         # Check the post-context.
2574                         if (defined $chunks[1]) {
2575                                 my ($cond, $block) = @{$chunks[1]};
2576                                 if (defined $cond) {
2577                                         substr($block, 0, length($cond), '');
2578                                 }
2579                                 if ($block =~ /^\s*\{/) {
2580                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
2581                                         $allowed = 1;
2582                                 }
2583                         }
2584                         if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2585                                 my $herectx = $here . "\n";;
2586                                 my $cnt = statement_rawlines($block);
2587
2588                                 for (my $n = 0; $n < $cnt; $n++) {
2589                                         $herectx .= raw_line($linenr, $n) . "\n";;
2590                                 }
2591
2592                                 WARN("braces {} are necessary even for single statement blocks\n" . $herectx);
2593                         }
2594                 }
2595
2596 # don't include deprecated include files (uses RAW line)
2597                 for my $inc (@dep_includes) {
2598                         if ($rawline =~ m@^.\s*\#\s*include\s*\<$inc>@) {
2599                                 ERROR("Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2600                         }
2601                 }
2602
2603 # don't use deprecated functions
2604                 for my $func (@dep_functions) {
2605                         if ($line =~ /\b$func\b/) {
2606                                 ERROR("Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2607                         }
2608                 }
2609
2610 # no volatiles please
2611                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2612                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2613                         WARN("Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
2614                 }
2615
2616 # SPIN_LOCK_UNLOCKED & RW_LOCK_UNLOCKED are deprecated
2617                 if ($line =~ /\b(SPIN_LOCK_UNLOCKED|RW_LOCK_UNLOCKED)/) {
2618                         ERROR("Use of $1 is deprecated: see Documentation/spinlocks.txt\n" . $herecurr);
2619                 }
2620
2621 # warn about #if 0
2622                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2623                         CHK("if this code is redundant consider removing it\n" .
2624                                 $herecurr);
2625                 }
2626
2627 # check for needless kfree() checks
2628                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2629                         my $expr = $1;
2630                         if ($line =~ /\bkfree\(\Q$expr\E\);/) {
2631                                 WARN("kfree(NULL) is safe this check is probably not required\n" . $hereprev);
2632                         }
2633                 }
2634 # check for needless usb_free_urb() checks
2635                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2636                         my $expr = $1;
2637                         if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
2638                                 WARN("usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
2639                         }
2640                 }
2641
2642 # prefer usleep_range over udelay
2643                 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
2644                         # ignore udelay's < 10, however
2645                         if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
2646                                 CHK("usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
2647                         }
2648                 }
2649
2650 # warn about unexpectedly long msleep's
2651                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
2652                         if ($1 < 20) {
2653                                 WARN("msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
2654                         }
2655                 }
2656
2657 # warn about #ifdefs in C files
2658 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
2659 #                       print "#ifdef in C files should be avoided\n";
2660 #                       print "$herecurr";
2661 #                       $clean = 0;
2662 #               }
2663
2664 # warn about spacing in #ifdefs
2665                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
2666                         ERROR("exactly one space required after that #$1\n" . $herecurr);
2667                 }
2668
2669 # check for spinlock_t definitions without a comment.
2670                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
2671                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
2672                         my $which = $1;
2673                         if (!ctx_has_comment($first_line, $linenr)) {
2674                                 CHK("$1 definition without comment\n" . $herecurr);
2675                         }
2676                 }
2677 # check for memory barriers without a comment.
2678                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
2679                         if (!ctx_has_comment($first_line, $linenr)) {
2680                                 CHK("memory barrier without comment\n" . $herecurr);
2681                         }
2682                 }
2683 # check of hardware specific defines
2684                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
2685                         CHK("architecture specific defines should be avoided\n" .  $herecurr);
2686                 }
2687
2688 # Check that the storage class is at the beginning of a declaration
2689                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2690                         WARN("storage class should be at the beginning of the declaration\n" . $herecurr)
2691                 }
2692
2693 # check the location of the inline attribute, that it is between
2694 # storage class and type.
2695                 if ($line =~ /\b$Type\s+$Inline\b/ ||
2696                     $line =~ /\b$Inline\s+$Storage\b/) {
2697                         ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2698                 }
2699
2700 # Check for __inline__ and __inline, prefer inline
2701                 if ($line =~ /\b(__inline__|__inline)\b/) {
2702                         WARN("plain inline is preferred over $1\n" . $herecurr);
2703                 }
2704
2705 # check for sizeof(&)
2706                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
2707                         WARN("sizeof(& should be avoided\n" . $herecurr);
2708                 }
2709
2710 # check for new externs in .c files.
2711                 if ($realfile =~ /\.c$/ && defined $stat &&
2712                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2713                 {
2714                         my $function_name = $1;
2715                         my $paren_space = $2;
2716
2717                         my $s = $stat;
2718                         if (defined $cond) {
2719                                 substr($s, 0, length($cond), '');
2720                         }
2721                         if ($s =~ /^\s*;/ &&
2722                             $function_name ne 'uninitialized_var')
2723                         {
2724                                 WARN("externs should be avoided in .c files\n" .  $herecurr);
2725                         }
2726
2727                         if ($paren_space =~ /\n/) {
2728                                 WARN("arguments for function declarations should follow identifier\n" . $herecurr);
2729                         }
2730
2731                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
2732                     $stat =~ /^.\s*extern\s+/)
2733                 {
2734                         WARN("externs should be avoided in .c files\n" .  $herecurr);
2735                 }
2736
2737 # checks for new __setup's
2738                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
2739                         my $name = $1;
2740
2741                         if (!grep(/$name/, @setup_docs)) {
2742                                 CHK("__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
2743                         }
2744                 }
2745
2746 # check for pointless casting of kmalloc return
2747                 if ($line =~ /\*\s*\)\s*k[czm]alloc\b/) {
2748                         WARN("unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
2749                 }
2750
2751 # check for gcc specific __FUNCTION__
2752                 if ($line =~ /__FUNCTION__/) {
2753                         WARN("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2754                 }
2755
2756 # check for semaphores used as mutexes
2757                 if ($line =~ /^.\s*(DECLARE_MUTEX|init_MUTEX)\s*\(/) {
2758                         WARN("mutexes are preferred for single holder semaphores\n" . $herecurr);
2759                 }
2760 # check for semaphores used as mutexes
2761                 if ($line =~ /^.\s*init_MUTEX_LOCKED\s*\(/) {
2762                         WARN("consider using a completion\n" . $herecurr);
2763
2764                 }
2765 # recommend strict_strto* over simple_strto*
2766                 if ($line =~ /\bsimple_(strto.*?)\s*\(/) {
2767                         WARN("consider using strict_$1 in preference to simple_$1\n" . $herecurr);
2768                 }
2769 # check for __initcall(), use device_initcall() explicitly please
2770                 if ($line =~ /^.\s*__initcall\s*\(/) {
2771                         WARN("please use device_initcall() instead of __initcall()\n" . $herecurr);
2772                 }
2773 # check for various ops structs, ensure they are const.
2774                 my $struct_ops = qr{acpi_dock_ops|
2775                                 address_space_operations|
2776                                 backlight_ops|
2777                                 block_device_operations|
2778                                 dentry_operations|
2779                                 dev_pm_ops|
2780                                 dma_map_ops|
2781                                 extent_io_ops|
2782                                 file_lock_operations|
2783                                 file_operations|
2784                                 hv_ops|
2785                                 ide_dma_ops|
2786                                 intel_dvo_dev_ops|
2787                                 item_operations|
2788                                 iwl_ops|
2789                                 kgdb_arch|
2790                                 kgdb_io|
2791                                 kset_uevent_ops|
2792                                 lock_manager_operations|
2793                                 microcode_ops|
2794                                 mtrr_ops|
2795                                 neigh_ops|
2796                                 nlmsvc_binding|
2797                                 pci_raw_ops|
2798                                 pipe_buf_operations|
2799                                 platform_hibernation_ops|
2800                                 platform_suspend_ops|
2801                                 proto_ops|
2802                                 rpc_pipe_ops|
2803                                 seq_operations|
2804                                 snd_ac97_build_ops|
2805                                 soc_pcmcia_socket_ops|
2806                                 stacktrace_ops|
2807                                 sysfs_ops|
2808                                 tty_operations|
2809                                 usb_mon_operations|
2810                                 wd_ops}x;
2811                 if ($line !~ /\bconst\b/ &&
2812                     $line =~ /\bstruct\s+($struct_ops)\b/) {
2813                         WARN("struct $1 should normally be const\n" .
2814                                 $herecurr);
2815                 }
2816
2817 # use of NR_CPUS is usually wrong
2818 # ignore definitions of NR_CPUS and usage to define arrays as likely right
2819                 if ($line =~ /\bNR_CPUS\b/ &&
2820                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
2821                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
2822                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
2823                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
2824                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
2825                 {
2826                         WARN("usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
2827                 }
2828
2829 # check for %L{u,d,i} in strings
2830                 my $string;
2831                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2832                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
2833                         $string =~ s/%%/__/g;
2834                         if ($string =~ /(?<!%)%L[udi]/) {
2835                                 WARN("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2836                                 last;
2837                         }
2838                 }
2839
2840 # whine mightly about in_atomic
2841                 if ($line =~ /\bin_atomic\s*\(/) {
2842                         if ($realfile =~ m@^drivers/@) {
2843                                 ERROR("do not use in_atomic in drivers\n" . $herecurr);
2844                         } elsif ($realfile !~ m@^kernel/@) {
2845                                 WARN("use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
2846                         }
2847                 }
2848
2849 # check for lockdep_set_novalidate_class
2850                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
2851                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
2852                         if ($realfile !~ m@^kernel/lockdep@ &&
2853                             $realfile !~ m@^include/linux/lockdep@ &&
2854                             $realfile !~ m@^drivers/base/core@) {
2855                                 ERROR("lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
2856                         }
2857                 }
2858         }
2859
2860         # If we have no input at all, then there is nothing to report on
2861         # so just keep quiet.
2862         if ($#rawlines == -1) {
2863                 exit(0);
2864         }
2865
2866         # In mailback mode only produce a report in the negative, for
2867         # things that appear to be patches.
2868         if ($mailback && ($clean == 1 || !$is_patch)) {
2869                 exit(0);
2870         }
2871
2872         # This is not a patch, and we are are in 'no-patch' mode so
2873         # just keep quiet.
2874         if (!$chk_patch && !$is_patch) {
2875                 exit(0);
2876         }
2877
2878         if (!$is_patch) {
2879                 ERROR("Does not appear to be a unified-diff format patch\n");
2880         }
2881         if ($is_patch && $chk_signoff && $signoff == 0) {
2882                 ERROR("Missing Signed-off-by: line(s)\n");
2883         }
2884
2885         print report_dump();
2886         if ($summary && !($clean == 1 && $quiet == 1)) {
2887                 print "$filename " if ($summary_file);
2888                 print "total: $cnt_error errors, $cnt_warn warnings, " .
2889                         (($check)? "$cnt_chk checks, " : "") .
2890                         "$cnt_lines lines checked\n";
2891                 print "\n" if ($quiet == 0);
2892         }
2893
2894         if ($quiet == 0) {
2895                 # If there were whitespace errors which cleanpatch can fix
2896                 # then suggest that.
2897 #               if ($rpt_cleaners) {
2898 #                       print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
2899 #                       print "      scripts/cleanfile\n\n";
2900 #               }
2901         }
2902
2903         if ($clean == 1 && $quiet == 0) {
2904                 print "$vname has no obvious style problems and is ready for submission.\n"
2905         }
2906         if ($clean == 0 && $quiet == 0) {
2907                 print "$vname has style problems, please review.  If any of these errors\n";
2908                 print "are false positives report them to the maintainer, see\n";
2909                 print "CHECKPATCH in MAINTAINERS.\n";
2910         }
2911
2912         return $clean;
2913 }