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 my $dbg_adv_dcs = 0;
 101 my $dbg_adv_checking = 0;
 102 my $dbg_adv_apw = 0;
 103 for my $key (keys %debug) {
 104         ## no critic
 105         eval "\${dbg_$key} = '$debug{$key}';";
 106         die "$@" if ($@);
 107 }
 108
 109 my $rpt_cleaners = 0;
 110
 111 if ($terse) {
 112         $emacs = 1;
 113         $quiet++;
 114 }
 115
 116 if ($tree) {
 117         if (defined $root) {
 118                 if (!top_of_kernel_tree($root)) {
 119                         die "$P: $root: --root does not point at a valid tree\n";
 120                 }
 121         } else {
 122                 if (top_of_kernel_tree('.')) {
 123                         $root = '.';
 124                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 125                                                 top_of_kernel_tree($1)) {
 126                         $root = $1;
 127                 }
 128         }
 129
 130         if (!defined $root) {
 131                 print "Must be run from the top-level dir. of a kernel tree\n";
 132                 exit(2);
 133         }
 134 }
 135
 136 my $emitted_corrupt = 0;
 137
 138 our $Ident      = qr{
 139                         [A-Za-z_][A-Za-z\d_]*
 140                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 141                 }x;
 142 our $Storage    = qr{extern|static|asmlinkage};
 143 our $Sparse     = qr{
 144                         __user|
 145                         __kernel|
 146                         __force|
 147                         __iomem|
 148                         __must_check|
 149                         __init_refok|
 150                         __kprobes|
 151                         __ref
 152                 }x;
 153
 154 # Notes to $Attribute:
 155 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 156 our $Attribute  = qr{
 157                         const|
 158                         __percpu|
 159                         __nocast|
 160                         __safe|
 161                         __bitwise__|
 162                         __packed__|
 163                         __packed2__|
 164                         __naked|
 165                         __maybe_unused|
 166                         __always_unused|
 167                         __noreturn|
 168                         __used|
 169                         __cold|
 170                         __noclone|
 171                         __deprecated|
 172                         __read_mostly|
 173                         __kprobes|
 174                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 175                         ____cacheline_aligned|
 176                         ____cacheline_aligned_in_smp|
 177                         ____cacheline_internodealigned_in_smp|
 178                         __weak
 179                   }x;
 180 our $Modifier;
 181 our $Inline     = qr{inline|__always_inline|noinline};
 182 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 183 our $Lval       = qr{$Ident(?:$Member)*};
 184
 185 our $Constant   = qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
 186 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 187 our $Compare    = qr{<=|>=|==|!=|<|>};
 188 our $Operators  = qr{
 189                         <=|>=|==|!=|
 190                         =>|->|<<|>>|<|>|!|~|
 191                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 192                   }x;
 193
 194 our $NonptrType;
 195 our $Type;
 196 our $Declare;
 197
 198 our $UTF8       = qr {
 199         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 200         | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
 201         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 202         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 203         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 204         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 205         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 206         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 207 }x;
 208
 209 # There are still some false positives, but this catches most
 210 # common cases.
 211 our $typeTypedefs = qr{(?x:
 212         [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
 213         | [A-Z][A-Z\d_]*AIOCB               # all uppercase
 214         | [A-Z][A-Z\d_]*CPU                 # all uppercase
 215         | QEMUBH                            # all uppercase
 216 )};
 217
 218 our $logFunctions = qr{(?x:
 219         printk|
 220         pr_(debug|dbg|vdbg|devel|info|warning|err|notice|alert|crit|emerg|cont)|
 221         (dev|netdev|netif)_(printk|dbg|vdbg|info|warn|err|notice|alert|crit|emerg|WARN)|
 222         WARN|
 223         panic
 224 )};
 225
 226 our @typeList = (
 227         qr{void},
 228         qr{(?:unsigned\s+)?char},
 229         qr{(?:unsigned\s+)?short},
 230         qr{(?:unsigned\s+)?int},
 231         qr{(?:unsigned\s+)?long},
 232         qr{(?:unsigned\s+)?long\s+int},
 233         qr{(?:unsigned\s+)?long\s+long},
 234         qr{(?:unsigned\s+)?long\s+long\s+int},
 235         qr{unsigned},
 236         qr{float},
 237         qr{double},
 238         qr{bool},
 239         qr{struct\s+$Ident},
 240         qr{union\s+$Ident},
 241         qr{enum\s+$Ident},
 242         qr{${Ident}_t},
 243         qr{${Ident}_handler},
 244         qr{${Ident}_handler_fn},
 245 );
 246 our @modifierList = (
 247         qr{fastcall},
 248 );
 249
 250 our $allowed_asm_includes = qr{(?x:
 251         irq|
 252         memory
 253 )};
 254 # memory.h: ARM has a custom one
 255
 256 sub build_types {
 257         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 258         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 259         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 260         $NonptrType     = qr{
 261                         (?:$Modifier\s+|const\s+)*
 262                         (?:
 263                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
 264                                 (?:$typeTypedefs\b)|
 265                                 (?:${all}\b)
 266                         )
 267                         (?:\s+$Modifier|\s+const)*
 268                   }x;
 269         $Type   = qr{
 270                         $NonptrType
 271                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
 272                         (?:\s+$Inline|\s+$Modifier)*
 273                   }x;
 274         $Declare        = qr{(?:$Storage\s+)?$Type};
 275 }
 276 build_types();
 277
 278 $chk_signoff = 0 if ($file);
 279
 280 my @dep_includes = ();
 281 my @dep_functions = ();
 282 my $removal = "Documentation/feature-removal-schedule.txt";
 283 if ($tree && -f "$root/$removal") {
 284         open(my $REMOVE, '<', "$root/$removal") ||
 285                                 die "$P: $removal: open failed - $!\n";
 286         while (<$REMOVE>) {
 287                 if (/^Check:\s+(.*\S)/) {
 288                         for my $entry (split(/[, ]+/, $1)) {
 289                                 if ($entry =~ m@include/(.*)@) {
 290                                         push(@dep_includes, $1);
 291
 292                                 } elsif ($entry !~ m@/@) {
 293                                         push(@dep_functions, $entry);
 294                                 }
 295                         }
 296                 }
 297         }
 298         close($REMOVE);
 299 }
 300
 301 my @rawlines = ();
 302 my @lines = ();
 303 my $vname;
 304 for my $filename (@ARGV) {
 305         my $FILE;
 306         if ($file) {
 307                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 308                         die "$P: $filename: diff failed - $!\n";
 309         } elsif ($filename eq '-') {
 310                 open($FILE, '<&STDIN');
 311         } else {
 312                 open($FILE, '<', "$filename") ||
 313                         die "$P: $filename: open failed - $!\n";
 314         }
 315         if ($filename eq '-') {
 316                 $vname = 'Your patch';
 317         } else {
 318                 $vname = $filename;
 319         }
 320         while (<$FILE>) {
 321                 chomp;
 322                 push(@rawlines, $_);
 323         }
 324         close($FILE);
 325         if (!process($filename)) {
 326                 $exit = 1;
 327         }
 328         @rawlines = ();
 329         @lines = ();
 330 }
 331
 332 exit($exit);
 333
 334 sub top_of_kernel_tree {
 335         my ($root) = @_;
 336
 337         my @tree_check = (
 338                 "COPYING", "MAINTAINERS", "Makefile",
 339                 "README", "docs", "VERSION",
 340                 "vl.c"
 341         );
 342
 343         foreach my $check (@tree_check) {
 344                 if (! -e $root . '/' . $check) {
 345                         return 0;
 346                 }
 347         }
 348         return 1;
 349 }
 350
 351 sub expand_tabs {
 352         my ($str) = @_;
 353
 354         my $res = '';
 355         my $n = 0;
 356         for my $c (split(//, $str)) {
 357                 if ($c eq "\t") {
 358                         $res .= ' ';
 359                         $n++;
 360                         for (; ($n % 8) != 0; $n++) {
 361                                 $res .= ' ';
 362                         }
 363                         next;
 364                 }
 365                 $res .= $c;
 366                 $n++;
 367         }
 368
 369         return $res;
 370 }
 371 sub copy_spacing {
 372         (my $res = shift) =~ tr/\t/ /c;
 373         return $res;
 374 }
 375
 376 sub line_stats {
 377         my ($line) = @_;
 378
 379         # Drop the diff line leader and expand tabs
 380         $line =~ s/^.//;
 381         $line = expand_tabs($line);
 382
 383         # Pick the indent from the front of the line.
 384         my ($white) = ($line =~ /^(\s*)/);
 385
 386         return (length($line), length($white));
 387 }
 388
 389 my $sanitise_quote = '';
 390
 391 sub sanitise_line_reset {
 392         my ($in_comment) = @_;
 393
 394         if ($in_comment) {
 395                 $sanitise_quote = '*/';
 396         } else {
 397                 $sanitise_quote = '';
 398         }
 399 }
 400 sub sanitise_line {
 401         my ($line) = @_;
 402
 403         my $res = '';
 404         my $l = '';
 405
 406         my $qlen = 0;
 407         my $off = 0;
 408         my $c;
 409
 410         # Always copy over the diff marker.
 411         $res = substr($line, 0, 1);
 412
 413         for ($off = 1; $off < length($line); $off++) {
 414                 $c = substr($line, $off, 1);
 415
 416                 # Comments we are wacking completly including the begin
 417                 # and end, all to $;.
 418                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 419                         $sanitise_quote = '*/';
 420
 421                         substr($res, $off, 2, "$;$;");
 422                         $off++;
 423                         next;
 424                 }
 425                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 426                         $sanitise_quote = '';
 427                         substr($res, $off, 2, "$;$;");
 428                         $off++;
 429                         next;
 430                 }
 431                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 432                         $sanitise_quote = '//';
 433
 434                         substr($res, $off, 2, $sanitise_quote);
 435                         $off++;
 436                         next;
 437                 }
 438
 439                 # A \ in a string means ignore the next character.
 440                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 441                     $c eq "\\") {
 442                         substr($res, $off, 2, 'XX');
 443                         $off++;
 444                         next;
 445                 }
 446                 # Regular quotes.
 447                 if ($c eq "'" || $c eq '"') {
 448                         if ($sanitise_quote eq '') {
 449                                 $sanitise_quote = $c;
 450
 451                                 substr($res, $off, 1, $c);
 452                                 next;
 453                         } elsif ($sanitise_quote eq $c) {
 454                                 $sanitise_quote = '';
 455                         }
 456                 }
 457
 458                 #print "c<$c> SQ<$sanitise_quote>\n";
 459                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 460                         substr($res, $off, 1, $;);
 461                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 462                         substr($res, $off, 1, $;);
 463                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 464                         substr($res, $off, 1, 'X');
 465                 } else {
 466                         substr($res, $off, 1, $c);
 467                 }
 468         }
 469
 470         if ($sanitise_quote eq '//') {
 471                 $sanitise_quote = '';
 472         }
 473
 474         # The pathname on a #include may be surrounded by '<' and '>'.
 475         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 476                 my $clean = 'X' x length($1);
 477                 $res =~ s@\<.*\>@<$clean>@;
 478
 479         # The whole of a #error is a string.
 480         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 481                 my $clean = 'X' x length($1);
 482                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 483         }
 484
 485         return $res;
 486 }
 487
 488 sub ctx_statement_block {
 489         my ($linenr, $remain, $off) = @_;
 490         my $line = $linenr - 1;
 491         my $blk = '';
 492         my $soff = $off;
 493         my $coff = $off - 1;
 494         my $coff_set = 0;
 495
 496         my $loff = 0;
 497
 498         my $type = '';
 499         my $level = 0;
 500         my @stack = ();
 501         my $p;
 502         my $c;
 503         my $len = 0;
 504
 505         my $remainder;
 506         while (1) {
 507                 @stack = (['', 0]) if ($#stack == -1);
 508
 509                 #warn "CSB: blk<$blk> remain<$remain>\n";
 510                 # If we are about to drop off the end, pull in more
 511                 # context.
 512                 if ($off >= $len) {
 513                         for (; $remain > 0; $line++) {
 514                                 last if (!defined $lines[$line]);
 515                                 next if ($lines[$line] =~ /^-/);
 516                                 $remain--;
 517                                 $loff = $len;
 518                                 $blk .= $lines[$line] . "\n";
 519                                 $len = length($blk);
 520                                 $line++;
 521                                 last;
 522                         }
 523                         # Bail if there is no further context.
 524                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 525                         if ($off >= $len) {
 526                                 last;
 527                         }
 528                 }
 529                 $p = $c;
 530                 $c = substr($blk, $off, 1);
 531                 $remainder = substr($blk, $off);
 532
 533                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 534
 535                 # Handle nested #if/#else.
 536                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 537                         push(@stack, [ $type, $level ]);
 538                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 539                         ($type, $level) = @{$stack[$#stack - 1]};
 540                 } elsif ($remainder =~ /^#\s*endif\b/) {
 541                         ($type, $level) = @{pop(@stack)};
 542                 }
 543
 544                 # Statement ends at the ';' or a close '}' at the
 545                 # outermost level.
 546                 if ($level == 0 && $c eq ';') {
 547                         last;
 548                 }
 549
 550                 # An else is really a conditional as long as its not else if
 551                 if ($level == 0 && $coff_set == 0 &&
 552                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 553                                 $remainder =~ /^(else)(?:\s|{)/ &&
 554                                 $remainder !~ /^else\s+if\b/) {
 555                         $coff = $off + length($1) - 1;
 556                         $coff_set = 1;
 557                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 558                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 559                 }
 560
 561                 if (($type eq '' || $type eq '(') && $c eq '(') {
 562                         $level++;
 563                         $type = '(';
 564                 }
 565                 if ($type eq '(' && $c eq ')') {
 566                         $level--;
 567                         $type = ($level != 0)? '(' : '';
 568
 569                         if ($level == 0 && $coff < $soff) {
 570                                 $coff = $off;
 571                                 $coff_set = 1;
 572                                 #warn "CSB: mark coff<$coff>\n";
 573                         }
 574                 }
 575                 if (($type eq '' || $type eq '{') && $c eq '{') {
 576                         $level++;
 577                         $type = '{';
 578                 }
 579                 if ($type eq '{' && $c eq '}') {
 580                         $level--;
 581                         $type = ($level != 0)? '{' : '';
 582
 583                         if ($level == 0) {
 584                                 if (substr($blk, $off + 1, 1) eq ';') {
 585                                         $off++;
 586                                 }
 587                                 last;
 588                         }
 589                 }
 590                 $off++;
 591         }
 592         # We are truly at the end, so shuffle to the next line.
 593         if ($off == $len) {
 594                 $loff = $len + 1;
 595                 $line++;
 596                 $remain--;
 597         }
 598
 599         my $statement = substr($blk, $soff, $off - $soff + 1);
 600         my $condition = substr($blk, $soff, $coff - $soff + 1);
 601
 602         #warn "STATEMENT<$statement>\n";
 603         #warn "CONDITION<$condition>\n";
 604
 605         #print "coff<$coff> soff<$off> loff<$loff>\n";
 606
 607         return ($statement, $condition,
 608                         $line, $remain + 1, $off - $loff + 1, $level);
 609 }
 610
 611 sub statement_lines {
 612         my ($stmt) = @_;
 613
 614         # Strip the diff line prefixes and rip blank lines at start and end.
 615         $stmt =~ s/(^|\n)./$1/g;
 616         $stmt =~ s/^\s*//;
 617         $stmt =~ s/\s*$//;
 618
 619         my @stmt_lines = ($stmt =~ /\n/g);
 620
 621         return $#stmt_lines + 2;
 622 }
 623
 624 sub statement_rawlines {
 625         my ($stmt) = @_;
 626
 627         my @stmt_lines = ($stmt =~ /\n/g);
 628
 629         return $#stmt_lines + 2;
 630 }
 631
 632 sub statement_block_size {
 633         my ($stmt) = @_;
 634
 635         $stmt =~ s/(^|\n)./$1/g;
 636         $stmt =~ s/^\s*{//;
 637         $stmt =~ s/}\s*$//;
 638         $stmt =~ s/^\s*//;
 639         $stmt =~ s/\s*$//;
 640
 641         my @stmt_lines = ($stmt =~ /\n/g);
 642         my @stmt_statements = ($stmt =~ /;/g);
 643
 644         my $stmt_lines = $#stmt_lines + 2;
 645         my $stmt_statements = $#stmt_statements + 1;
 646
 647         if ($stmt_lines > $stmt_statements) {
 648                 return $stmt_lines;
 649         } else {
 650                 return $stmt_statements;
 651         }
 652 }
 653
 654 sub ctx_statement_full {
 655         my ($linenr, $remain, $off) = @_;
 656         my ($statement, $condition, $level);
 657
 658         my (@chunks);
 659
 660         # Grab the first conditional/block pair.
 661         ($statement, $condition, $linenr, $remain, $off, $level) =
 662                                 ctx_statement_block($linenr, $remain, $off);
 663         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 664         push(@chunks, [ $condition, $statement ]);
 665         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 666                 return ($level, $linenr, @chunks);
 667         }
 668
 669         # Pull in the following conditional/block pairs and see if they
 670         # could continue the statement.
 671         for (;;) {
 672                 ($statement, $condition, $linenr, $remain, $off, $level) =
 673                                 ctx_statement_block($linenr, $remain, $off);
 674                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 675                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 676                 #print "C: push\n";
 677                 push(@chunks, [ $condition, $statement ]);
 678         }
 679
 680         return ($level, $linenr, @chunks);
 681 }
 682
 683 sub ctx_block_get {
 684         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 685         my $line;
 686         my $start = $linenr - 1;
 687         my $blk = '';
 688         my @o;
 689         my @c;
 690         my @res = ();
 691
 692         my $level = 0;
 693         my @stack = ($level);
 694         for ($line = $start; $remain > 0; $line++) {
 695                 next if ($rawlines[$line] =~ /^-/);
 696                 $remain--;
 697
 698                 $blk .= $rawlines[$line];
 699
 700                 # Handle nested #if/#else.
 701                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 702                         push(@stack, $level);
 703                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 704                         $level = $stack[$#stack - 1];
 705                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 706                         $level = pop(@stack);
 707                 }
 708
 709                 foreach my $c (split(//, $lines[$line])) {
 710                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 711                         if ($off > 0) {
 712                                 $off--;
 713                                 next;
 714                         }
 715
 716                         if ($c eq $close && $level > 0) {
 717                                 $level--;
 718                                 last if ($level == 0);
 719                         } elsif ($c eq $open) {
 720                                 $level++;
 721                         }
 722                 }
 723
 724                 if (!$outer || $level <= 1) {
 725                         push(@res, $rawlines[$line]);
 726                 }
 727
 728                 last if ($level == 0);
 729         }
 730
 731         return ($level, @res);
 732 }
 733 sub ctx_block_outer {
 734         my ($linenr, $remain) = @_;
 735
 736         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 737         return @r;
 738 }
 739 sub ctx_block {
 740         my ($linenr, $remain) = @_;
 741
 742         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 743         return @r;
 744 }
 745 sub ctx_statement {
 746         my ($linenr, $remain, $off) = @_;
 747
 748         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 749         return @r;
 750 }
 751 sub ctx_block_level {
 752         my ($linenr, $remain) = @_;
 753
 754         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 755 }
 756 sub ctx_statement_level {
 757         my ($linenr, $remain, $off) = @_;
 758
 759         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 760 }
 761
 762 sub ctx_locate_comment {
 763         my ($first_line, $end_line) = @_;
 764
 765         # Catch a comment on the end of the line itself.
 766         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 767         return $current_comment if (defined $current_comment);
 768
 769         # Look through the context and try and figure out if there is a
 770         # comment.
 771         my $in_comment = 0;
 772         $current_comment = '';
 773         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 774                 my $line = $rawlines[$linenr - 1];
 775                 #warn "           $line\n";
 776                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 777                         $in_comment = 1;
 778                 }
 779                 if ($line =~ m@/\*@) {
 780                         $in_comment = 1;
 781                 }
 782                 if (!$in_comment && $current_comment ne '') {
 783                         $current_comment = '';
 784                 }
 785                 $current_comment .= $line . "\n" if ($in_comment);
 786                 if ($line =~ m@\*/@) {
 787                         $in_comment = 0;
 788                 }
 789         }
 790
 791         chomp($current_comment);
 792         return($current_comment);
 793 }
 794 sub ctx_has_comment {
 795         my ($first_line, $end_line) = @_;
 796         my $cmt = ctx_locate_comment($first_line, $end_line);
 797
 798         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 799         ##print "CMMT: $cmt\n";
 800
 801         return ($cmt ne '');
 802 }
 803
 804 sub raw_line {
 805         my ($linenr, $cnt) = @_;
 806
 807         my $offset = $linenr - 1;
 808         $cnt++;
 809
 810         my $line;
 811         while ($cnt) {
 812                 $line = $rawlines[$offset++];
 813                 next if (defined($line) && $line =~ /^-/);
 814                 $cnt--;
 815         }
 816
 817         return $line;
 818 }
 819
 820 sub cat_vet {
 821         my ($vet) = @_;
 822         my ($res, $coded);
 823
 824         $res = '';
 825         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 826                 $res .= $1;
 827                 if ($2 ne '') {
 828                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 829                         $res .= $coded;
 830                 }
 831         }
 832         $res =~ s/$/\$/;
 833
 834         return $res;
 835 }
 836
 837 my $av_preprocessor = 0;
 838 my $av_pending;
 839 my @av_paren_type;
 840 my $av_pend_colon;
 841
 842 sub annotate_reset {
 843         $av_preprocessor = 0;
 844         $av_pending = '_';
 845         @av_paren_type = ('E');
 846         $av_pend_colon = 'O';
 847 }
 848
 849 sub annotate_values {
 850         my ($stream, $type) = @_;
 851
 852         my $res;
 853         my $var = '_' x length($stream);
 854         my $cur = $stream;
 855
 856         print "$stream\n" if ($dbg_values > 1);
 857
 858         while (length($cur)) {
 859                 @av_paren_type = ('E') if ($#av_paren_type < 0);
 860                 print " <" . join('', @av_paren_type) .
 861                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
 862                 if ($cur =~ /^(\s+)/o) {
 863                         print "WS($1)\n" if ($dbg_values > 1);
 864                         if ($1 =~ /\n/ && $av_preprocessor) {
 865                                 $type = pop(@av_paren_type);
 866                                 $av_preprocessor = 0;
 867                         }
 868
 869                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
 870                         print "CAST($1)\n" if ($dbg_values > 1);
 871                         push(@av_paren_type, $type);
 872                         $type = 'C';
 873
 874                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
 875                         print "DECLARE($1)\n" if ($dbg_values > 1);
 876                         $type = 'T';
 877
 878                 } elsif ($cur =~ /^($Modifier)\s*/) {
 879                         print "MODIFIER($1)\n" if ($dbg_values > 1);
 880                         $type = 'T';
 881
 882                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
 883                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
 884                         $av_preprocessor = 1;
 885                         push(@av_paren_type, $type);
 886                         if ($2 ne '') {
 887                                 $av_pending = 'N';
 888                         }
 889                         $type = 'E';
 890
 891                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
 892                         print "UNDEF($1)\n" if ($dbg_values > 1);
 893                         $av_preprocessor = 1;
 894                         push(@av_paren_type, $type);
 895
 896                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
 897                         print "PRE_START($1)\n" if ($dbg_values > 1);
 898                         $av_preprocessor = 1;
 899
 900                         push(@av_paren_type, $type);
 901                         push(@av_paren_type, $type);
 902                         $type = 'E';
 903
 904                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
 905                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
 906                         $av_preprocessor = 1;
 907
 908                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
 909
 910                         $type = 'E';
 911
 912                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
 913                         print "PRE_END($1)\n" if ($dbg_values > 1);
 914
 915                         $av_preprocessor = 1;
 916
 917                         # Assume all arms of the conditional end as this
 918                         # one does, and continue as if the #endif was not here.
 919                         pop(@av_paren_type);
 920                         push(@av_paren_type, $type);
 921                         $type = 'E';
 922
 923                 } elsif ($cur =~ /^(\\\n)/o) {
 924                         print "PRECONT($1)\n" if ($dbg_values > 1);
 925
 926                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
 927                         print "ATTR($1)\n" if ($dbg_values > 1);
 928                         $av_pending = $type;
 929                         $type = 'N';
 930
 931                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
 932                         print "SIZEOF($1)\n" if ($dbg_values > 1);
 933                         if (defined $2) {
 934                                 $av_pending = 'V';
 935                         }
 936                         $type = 'N';
 937
 938                 } elsif ($cur =~ /^(if|while|for)\b/o) {
 939                         print "COND($1)\n" if ($dbg_values > 1);
 940                         $av_pending = 'E';
 941                         $type = 'N';
 942
 943                 } elsif ($cur =~/^(case)/o) {
 944                         print "CASE($1)\n" if ($dbg_values > 1);
 945                         $av_pend_colon = 'C';
 946                         $type = 'N';
 947
 948                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
 949                         print "KEYWORD($1)\n" if ($dbg_values > 1);
 950                         $type = 'N';
 951
 952                 } elsif ($cur =~ /^(\()/o) {
 953                         print "PAREN('$1')\n" if ($dbg_values > 1);
 954                         push(@av_paren_type, $av_pending);
 955                         $av_pending = '_';
 956                         $type = 'N';
 957
 958                 } elsif ($cur =~ /^(\))/o) {
 959                         my $new_type = pop(@av_paren_type);
 960                         if ($new_type ne '_') {
 961                                 $type = $new_type;
 962                                 print "PAREN('$1') -> $type\n"
 963                                                         if ($dbg_values > 1);
 964                         } else {
 965                                 print "PAREN('$1')\n" if ($dbg_values > 1);
 966                         }
 967
 968                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
 969                         print "FUNC($1)\n" if ($dbg_values > 1);
 970                         $type = 'V';
 971                         $av_pending = 'V';
 972
 973                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
 974                         if (defined $2 && $type eq 'C' || $type eq 'T') {
 975                                 $av_pend_colon = 'B';
 976                         } elsif ($type eq 'E') {
 977                                 $av_pend_colon = 'L';
 978                         }
 979                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
 980                         $type = 'V';
 981
 982                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
 983                         print "IDENT($1)\n" if ($dbg_values > 1);
 984                         $type = 'V';
 985
 986                 } elsif ($cur =~ /^($Assignment)/o) {
 987                         print "ASSIGN($1)\n" if ($dbg_values > 1);
 988                         $type = 'N';
 989
 990                 } elsif ($cur =~/^(;|{|})/) {
 991                         print "END($1)\n" if ($dbg_values > 1);
 992                         $type = 'E';
 993                         $av_pend_colon = 'O';
 994
 995                 } elsif ($cur =~/^(,)/) {
 996                         print "COMMA($1)\n" if ($dbg_values > 1);
 997                         $type = 'C';
 998
 999                 } elsif ($cur =~ /^(\?)/o) {
1000                         print "QUESTION($1)\n" if ($dbg_values > 1);
1001                         $type = 'N';
1002
1003                 } elsif ($cur =~ /^(:)/o) {
1004                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1005
1006                         substr($var, length($res), 1, $av_pend_colon);
1007                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1008                                 $type = 'E';
1009                         } else {
1010                                 $type = 'N';
1011                         }
1012                         $av_pend_colon = 'O';
1013
1014                 } elsif ($cur =~ /^(\[)/o) {
1015                         print "CLOSE($1)\n" if ($dbg_values > 1);
1016                         $type = 'N';
1017
1018                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1019                         my $variant;
1020
1021                         print "OPV($1)\n" if ($dbg_values > 1);
1022                         if ($type eq 'V') {
1023                                 $variant = 'B';
1024                         } else {
1025                                 $variant = 'U';
1026                         }
1027
1028                         substr($var, length($res), 1, $variant);
1029                         $type = 'N';
1030
1031                 } elsif ($cur =~ /^($Operators)/o) {
1032                         print "OP($1)\n" if ($dbg_values > 1);
1033                         if ($1 ne '++' && $1 ne '--') {
1034                                 $type = 'N';
1035                         }
1036
1037                 } elsif ($cur =~ /(^.)/o) {
1038                         print "C($1)\n" if ($dbg_values > 1);
1039                 }
1040                 if (defined $1) {
1041                         $cur = substr($cur, length($1));
1042                         $res .= $type x length($1);
1043                 }
1044         }
1045
1046         return ($res, $var);
1047 }
1048
1049 sub possible {
1050         my ($possible, $line) = @_;
1051         my $notPermitted = qr{(?:
1052                 ^(?:
1053                         $Modifier|
1054                         $Storage|
1055                         $Type|
1056                         DEFINE_\S+
1057                 )$|
1058                 ^(?:
1059                         goto|
1060                         return|
1061                         case|
1062                         else|
1063                         asm|__asm__|
1064                         do
1065                 )(?:\s|$)|
1066                 ^(?:typedef|struct|enum)\b
1067             )}x;
1068         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1069         if ($possible !~ $notPermitted) {
1070                 # Check for modifiers.
1071                 $possible =~ s/\s*$Storage\s*//g;
1072                 $possible =~ s/\s*$Sparse\s*//g;
1073                 if ($possible =~ /^\s*$/) {
1074
1075                 } elsif ($possible =~ /\s/) {
1076                         $possible =~ s/\s*$Type\s*//g;
1077                         for my $modifier (split(' ', $possible)) {
1078                                 if ($modifier !~ $notPermitted) {
1079                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1080                                         push(@modifierList, $modifier);
1081                                 }
1082                         }
1083
1084                 } else {
1085                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1086                         push(@typeList, $possible);
1087                 }
1088                 build_types();
1089         } else {
1090                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1091         }
1092 }
1093
1094 my $prefix = '';
1095
1096 sub report {
1097         if (defined $tst_only && $_[0] !~ /\Q$tst_only\E/) {
1098                 return 0;
1099         }
1100         my $line = $prefix . $_[0];
1101
1102         $line = (split('\n', $line))[0] . "\n" if ($terse);
1103
1104         push(our @report, $line);
1105
1106         return 1;
1107 }
1108 sub report_dump {
1109         our @report;
1110 }
1111 sub ERROR {
1112         if (report("ERROR: $_[0]\n")) {
1113                 our $clean = 0;
1114                 our $cnt_error++;
1115         }
1116 }
1117 sub WARN {
1118         if (report("WARNING: $_[0]\n")) {
1119                 our $clean = 0;
1120                 our $cnt_warn++;
1121         }
1122 }
1123 sub CHK {
1124         if ($check && report("CHECK: $_[0]\n")) {
1125                 our $clean = 0;
1126                 our $cnt_chk++;
1127         }
1128 }
1129
1130 sub check_absolute_file {
1131         my ($absolute, $herecurr) = @_;
1132         my $file = $absolute;
1133
1134         ##print "absolute<$absolute>\n";
1135
1136         # See if any suffix of this path is a path within the tree.
1137         while ($file =~ s@^[^/]*/@@) {
1138                 if (-f "$root/$file") {
1139                         ##print "file<$file>\n";
1140                         last;
1141                 }
1142         }
1143         if (! -f _)  {
1144                 return 0;
1145         }
1146
1147         # It is, so see if the prefix is acceptable.
1148         my $prefix = $absolute;
1149         substr($prefix, -length($file)) = '';
1150
1151         ##print "prefix<$prefix>\n";
1152         if ($prefix ne ".../") {
1153                 WARN("use relative pathname instead of absolute in changelog text\n" . $herecurr);
1154         }
1155 }
1156
1157 sub process {
1158         my $filename = shift;
1159
1160         my $linenr=0;
1161         my $prevline="";
1162         my $prevrawline="";
1163         my $stashline="";
1164         my $stashrawline="";
1165
1166         my $length;
1167         my $indent;
1168         my $previndent=0;
1169         my $stashindent=0;
1170
1171         our $clean = 1;
1172         my $signoff = 0;
1173         my $is_patch = 0;
1174
1175         our @report = ();
1176         our $cnt_lines = 0;
1177         our $cnt_error = 0;
1178         our $cnt_warn = 0;
1179         our $cnt_chk = 0;
1180
1181         # Trace the real file/line as we go.
1182         my $realfile = '';
1183         my $realline = 0;
1184         my $realcnt = 0;
1185         my $here = '';
1186         my $in_comment = 0;
1187         my $comment_edge = 0;
1188         my $first_line = 0;
1189         my $p1_prefix = '';
1190
1191         my $prev_values = 'E';
1192
1193         # suppression flags
1194         my %suppress_ifbraces;
1195         my %suppress_whiletrailers;
1196         my %suppress_export;
1197
1198         # Pre-scan the patch sanitizing the lines.
1199         # Pre-scan the patch looking for any __setup documentation.
1200         #
1201         my @setup_docs = ();
1202         my $setup_docs = 0;
1203
1204         sanitise_line_reset();
1205         my $line;
1206         foreach my $rawline (@rawlines) {
1207                 $linenr++;
1208                 $line = $rawline;
1209
1210                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1211                         $setup_docs = 0;
1212                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1213                                 $setup_docs = 1;
1214                         }
1215                         #next;
1216                 }
1217                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1218                         $realline=$1-1;
1219                         if (defined $2) {
1220                                 $realcnt=$3+1;
1221                         } else {
1222                                 $realcnt=1+1;
1223                         }
1224                         $in_comment = 0;
1225
1226                         # Guestimate if this is a continuing comment.  Run
1227                         # the context looking for a comment "edge".  If this
1228                         # edge is a close comment then we must be in a comment
1229                         # at context start.
1230                         my $edge;
1231                         my $cnt = $realcnt;
1232                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1233                                 next if (defined $rawlines[$ln - 1] &&
1234                                          $rawlines[$ln - 1] =~ /^-/);
1235                                 $cnt--;
1236                                 #print "RAW<$rawlines[$ln - 1]>\n";
1237                                 last if (!defined $rawlines[$ln - 1]);
1238                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1239                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1240                                         ($edge) = $1;
1241                                         last;
1242                                 }
1243                         }
1244                         if (defined $edge && $edge eq '*/') {
1245                                 $in_comment = 1;
1246                         }
1247
1248                         # Guestimate if this is a continuing comment.  If this
1249                         # is the start of a diff block and this line starts
1250                         # ' *' then it is very likely a comment.
1251                         if (!defined $edge &&
1252                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1253                         {
1254                                 $in_comment = 1;
1255                         }
1256
1257                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1258                         sanitise_line_reset($in_comment);
1259
1260                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1261                         # Standardise the strings and chars within the input to
1262                         # simplify matching -- only bother with positive lines.
1263                         $line = sanitise_line($rawline);
1264                 }
1265                 push(@lines, $line);
1266
1267                 if ($realcnt > 1) {
1268                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1269                 } else {
1270                         $realcnt = 0;
1271                 }
1272
1273                 #print "==>$rawline\n";
1274                 #print "-->$line\n";
1275
1276                 if ($setup_docs && $line =~ /^\+/) {
1277                         push(@setup_docs, $line);
1278                 }
1279         }
1280
1281         $prefix = '';
1282
1283         $realcnt = 0;
1284         $linenr = 0;
1285         foreach my $line (@lines) {
1286                 $linenr++;
1287
1288                 my $rawline = $rawlines[$linenr - 1];
1289
1290 #extract the line range in the file after the patch is applied
1291                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1292                         $is_patch = 1;
1293                         $first_line = $linenr + 1;
1294                         $realline=$1-1;
1295                         if (defined $2) {
1296                                 $realcnt=$3+1;
1297                         } else {
1298                                 $realcnt=1+1;
1299                         }
1300                         annotate_reset();
1301                         $prev_values = 'E';
1302
1303                         %suppress_ifbraces = ();
1304                         %suppress_whiletrailers = ();
1305                         %suppress_export = ();
1306                         next;
1307
1308 # track the line number as we move through the hunk, note that
1309 # new versions of GNU diff omit the leading space on completely
1310 # blank context lines so we need to count that too.
1311                 } elsif ($line =~ /^( |\+|$)/) {
1312                         $realline++;
1313                         $realcnt-- if ($realcnt != 0);
1314
1315                         # Measure the line length and indent.
1316                         ($length, $indent) = line_stats($rawline);
1317
1318                         # Track the previous line.
1319                         ($prevline, $stashline) = ($stashline, $line);
1320                         ($previndent, $stashindent) = ($stashindent, $indent);
1321                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1322
1323                         #warn "line<$line>\n";
1324
1325                 } elsif ($realcnt == 1) {
1326                         $realcnt--;
1327                 }
1328
1329                 my $hunk_line = ($realcnt != 0);
1330
1331 #make up the handle for any error we report on this line
1332                 $prefix = "$filename:$realline: " if ($emacs && $file);
1333                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1334
1335                 $here = "#$linenr: " if (!$file);
1336                 $here = "#$realline: " if ($file);
1337
1338                 # extract the filename as it passes
1339                 if ($line =~ /^diff --git.*?(\S+)$/) {
1340                         $realfile = $1;
1341                         $realfile =~ s@^([^/]*)/@@;
1342
1343                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1344                         $realfile = $1;
1345                         $realfile =~ s@^([^/]*)/@@;
1346
1347                         $p1_prefix = $1;
1348                         if (!$file && $tree && $p1_prefix ne '' &&
1349                             -e "$root/$p1_prefix") {
1350                                 WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1351                         }
1352
1353                         if ($realfile =~ m@^include/asm/@) {
1354                                 ERROR("do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1355                         }
1356                         next;
1357                 }
1358
1359                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1360
1361                 my $hereline = "$here\n$rawline\n";
1362                 my $herecurr = "$here\n$rawline\n";
1363                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1364
1365                 $cnt_lines++ if ($realcnt != 0);
1366
1367 # Check for incorrect file permissions
1368                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1369                         my $permhere = $here . "FILE: $realfile\n";
1370                         if ($realfile =~ /(Makefile|Kconfig|\.c|\.cpp|\.h|\.S|\.tmpl)$/) {
1371                                 ERROR("do not set execute permissions for source files\n" . $permhere);
1372                         }
1373                 }
1374
1375 #check the patch for a signoff:
1376                 if ($line =~ /^\s*signed-off-by:/i) {
1377                         # This is a signoff, if ugly, so do not double report.
1378                         $signoff++;
1379                         if (!($line =~ /^\s*Signed-off-by:/)) {
1380                                 WARN("Signed-off-by: is the preferred form\n" .
1381                                         $herecurr);
1382                         }
1383                         if ($line =~ /^\s*signed-off-by:\S/i) {
1384                                 WARN("space required after Signed-off-by:\n" .
1385                                         $herecurr);
1386                         }
1387                 }
1388
1389 # Check for wrappage within a valid hunk of the file
1390                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1391                         ERROR("patch seems to be corrupt (line wrapped?)\n" .
1392                                 $herecurr) if (!$emitted_corrupt++);
1393                 }
1394
1395 # Check for absolute kernel paths.
1396                 if ($tree) {
1397                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1398                                 my $file = $1;
1399
1400                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1401                                     check_absolute_file($1, $herecurr)) {
1402                                         #
1403                                 } else {
1404                                         check_absolute_file($file, $herecurr);
1405                                 }
1406                         }
1407                 }
1408
1409 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1410                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1411                     $rawline !~ m/^$UTF8*$/) {
1412                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1413
1414                         my $blank = copy_spacing($rawline);
1415                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1416                         my $hereptr = "$hereline$ptr\n";
1417
1418                         ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1419                 }
1420
1421 # ignore non-hunk lines and lines being removed
1422                 next if (!$hunk_line || $line =~ /^-/);
1423
1424 #trailing whitespace
1425                 if ($line =~ /^\+.*\015/) {
1426                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1427                         ERROR("DOS line endings\n" . $herevet);
1428
1429                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1430                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1431                         ERROR("trailing whitespace\n" . $herevet);
1432                         $rpt_cleaners = 1;
1433                 }
1434
1435 # check for Kconfig help text having a real description
1436 # Only applies when adding the entry originally, after that we do not have
1437 # sufficient context to determine whether it is indeed long enough.
1438                 if ($realfile =~ /Kconfig/ &&
1439                     $line =~ /\+\s*(?:---)?help(?:---)?$/) {
1440                         my $length = 0;
1441                         my $cnt = $realcnt;
1442                         my $ln = $linenr + 1;
1443                         my $f;
1444                         my $is_end = 0;
1445                         while ($cnt > 0 && defined $lines[$ln - 1]) {
1446                                 $f = $lines[$ln - 1];
1447                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1448                                 $is_end = $lines[$ln - 1] =~ /^\+/;
1449                                 $ln++;
1450
1451                                 next if ($f =~ /^-/);
1452                                 $f =~ s/^.//;
1453                                 $f =~ s/#.*//;
1454                                 $f =~ s/^\s+//;
1455                                 next if ($f =~ /^$/);
1456                                 if ($f =~ /^\s*config\s/) {
1457                                         $is_end = 1;
1458                                         last;
1459                                 }
1460                                 $length++;
1461                         }
1462                         WARN("please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_end && $length < 4);
1463                         #print "is_end<$is_end> length<$length>\n";
1464                 }
1465
1466 # check we are in a valid source file if not then ignore this hunk
1467                 next if ($realfile !~ /\.(h|c|cpp|s|S|pl|sh)$/);
1468
1469 #80 column limit
1470                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1471                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1472                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:,|\)\s*;)\s*$/ ||
1473                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1474                     $length > 80)
1475                 {
1476                         WARN("line over 80 characters\n" . $herecurr);
1477                 }
1478
1479 # check for spaces before a quoted newline
1480                 if ($rawline =~ /^.*\".*\s\\n/) {
1481                         WARN("unnecessary whitespace before a quoted newline\n" . $herecurr);
1482                 }
1483
1484 # check for adding lines without a newline.
1485                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1486                         WARN("adding a line without newline at end of file\n" . $herecurr);
1487                 }
1488
1489 # Blackfin: use hi/lo macros
1490                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1491                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1492                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1493                                 ERROR("use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1494                         }
1495                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1496                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1497                                 ERROR("use the HI() macro, not (... >> 16)\n" . $herevet);
1498                         }
1499                 }
1500
1501 # check we are in a valid source file C or perl if not then ignore this hunk
1502                 next if ($realfile !~ /\.(h|c|cpp|pl)$/);
1503
1504 # in QEMU, no tabs are allowed
1505                 if ($rawline =~ /^\+.*\t/) {
1506                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1507                         ERROR("code indent should never use tabs\n" . $herevet);
1508                         $rpt_cleaners = 1;
1509                 }
1510
1511 # check we are in a valid C source file if not then ignore this hunk
1512                 next if ($realfile !~ /\.(h|c|cpp)$/);
1513
1514 # check for RCS/CVS revision markers
1515                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1516                         WARN("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1517                 }
1518
1519 # Blackfin: don't use __builtin_bfin_[cs]sync
1520                 if ($line =~ /__builtin_bfin_csync/) {
1521                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1522                         ERROR("use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1523                 }
1524                 if ($line =~ /__builtin_bfin_ssync/) {
1525                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1526                         ERROR("use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1527                 }
1528
1529 # Check for potential 'bare' types
1530                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1531                     $realline_next);
1532                 if ($realcnt && $line =~ /.\s*\S/) {
1533                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1534                                 ctx_statement_block($linenr, $realcnt, 0);
1535                         $stat =~ s/\n./\n /g;
1536                         $cond =~ s/\n./\n /g;
1537
1538                         # Find the real next line.
1539                         $realline_next = $line_nr_next;
1540                         if (defined $realline_next &&
1541                             (!defined $lines[$realline_next - 1] ||
1542                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1543                                 $realline_next++;
1544                         }
1545
1546                         my $s = $stat;
1547                         $s =~ s/{.*$//s;
1548
1549                         # Ignore goto labels.
1550                         if ($s =~ /$Ident:\*$/s) {
1551
1552                         # Ignore functions being called
1553                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1554
1555                         } elsif ($s =~ /^.\s*else\b/s) {
1556
1557                         # declarations always start with types
1558                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1559                                 my $type = $1;
1560                                 $type =~ s/\s+/ /g;
1561                                 possible($type, "A:" . $s);
1562
1563                         # definitions in global scope can only start with types
1564                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1565                                 possible($1, "B:" . $s);
1566                         }
1567
1568                         # any (foo ... *) is a pointer cast, and foo is a type
1569                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1570                                 possible($1, "C:" . $s);
1571                         }
1572
1573                         # Check for any sort of function declaration.
1574                         # int foo(something bar, other baz);
1575                         # void (*store_gdt)(x86_descr_ptr *);
1576                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1577                                 my ($name_len) = length($1);
1578
1579                                 my $ctx = $s;
1580                                 substr($ctx, 0, $name_len + 1, '');
1581                                 $ctx =~ s/\)[^\)]*$//;
1582
1583                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1584                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1585
1586                                                 possible($1, "D:" . $s);
1587                                         }
1588                                 }
1589                         }
1590
1591                 }
1592
1593 #
1594 # Checks which may be anchored in the context.
1595 #
1596
1597 # Check for switch () and associated case and default
1598 # statements should be at the same indent.
1599                 if ($line=~/\bswitch\s*\(.*\)/) {
1600                         my $err = '';
1601                         my $sep = '';
1602                         my @ctx = ctx_block_outer($linenr, $realcnt);
1603                         shift(@ctx);
1604                         for my $ctx (@ctx) {
1605                                 my ($clen, $cindent) = line_stats($ctx);
1606                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1607                                                         $indent != $cindent) {
1608                                         $err .= "$sep$ctx\n";
1609                                         $sep = '';
1610                                 } else {
1611                                         $sep = "[...]\n";
1612                                 }
1613                         }
1614                         if ($err ne '') {
1615                                 ERROR("switch and case should be at the same indent\n$hereline$err");
1616                         }
1617                 }
1618
1619 # if/while/etc brace do not go on next line, unless defining a do while loop,
1620 # or if that brace on the next line is for something else
1621                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1622                         my $pre_ctx = "$1$2";
1623
1624                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1625                         my $ctx_cnt = $realcnt - $#ctx - 1;
1626                         my $ctx = join("\n", @ctx);
1627
1628                         my $ctx_ln = $linenr;
1629                         my $ctx_skip = $realcnt;
1630
1631                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1632                                         defined $lines[$ctx_ln - 1] &&
1633                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1634                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1635                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1636                                 $ctx_ln++;
1637                         }
1638
1639                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1640                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1641
1642                         # The length of the "previous line" is checked against 80 because it
1643                         # includes the + at the beginning of the line (if the actual line has
1644                         # 79 or 80 characters, it is no longer possible to add a space and an
1645                         # opening brace there)
1646                         if ($#ctx == 0 && $ctx !~ /{\s*/ &&
1647                             defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/ &&
1648                             defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
1649                                 ERROR("that open brace { should be on the previous line\n" .
1650                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1651                         }
1652                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1653                             $ctx =~ /\)\s*\;\s*$/ &&
1654                             defined $lines[$ctx_ln - 1])
1655                         {
1656                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1657                                 if ($nindent > $indent) {
1658                                         WARN("trailing semicolon indicates no statements, indent implies otherwise\n" .
1659                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1660                                 }
1661                         }
1662                 }
1663
1664 # Check relative indent for conditionals and blocks.
1665                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1666                         my ($s, $c) = ($stat, $cond);
1667
1668                         substr($s, 0, length($c), '');
1669
1670                         # Make sure we remove the line prefixes as we have
1671                         # none on the first line, and are going to readd them
1672                         # where necessary.
1673                         $s =~ s/\n./\n/gs;
1674
1675                         # Find out how long the conditional actually is.
1676                         my @newlines = ($c =~ /\n/gs);
1677                         my $cond_lines = 1 + $#newlines;
1678
1679                         # We want to check the first line inside the block
1680                         # starting at the end of the conditional, so remove:
1681                         #  1) any blank line termination
1682                         #  2) any opening brace { on end of the line
1683                         #  3) any do (...) {
1684                         my $continuation = 0;
1685                         my $check = 0;
1686                         $s =~ s/^.*\bdo\b//;
1687                         $s =~ s/^\s*{//;
1688                         if ($s =~ s/^\s*\\//) {
1689                                 $continuation = 1;
1690                         }
1691                         if ($s =~ s/^\s*?\n//) {
1692                                 $check = 1;
1693                                 $cond_lines++;
1694                         }
1695
1696                         # Also ignore a loop construct at the end of a
1697                         # preprocessor statement.
1698                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1699                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1700                                 $check = 0;
1701                         }
1702
1703                         my $cond_ptr = -1;
1704                         $continuation = 0;
1705                         while ($cond_ptr != $cond_lines) {
1706                                 $cond_ptr = $cond_lines;
1707
1708                                 # If we see an #else/#elif then the code
1709                                 # is not linear.
1710                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1711                                         $check = 0;
1712                                 }
1713
1714                                 # Ignore:
1715                                 #  1) blank lines, they should be at 0,
1716                                 #  2) preprocessor lines, and
1717                                 #  3) labels.
1718                                 if ($continuation ||
1719                                     $s =~ /^\s*?\n/ ||
1720                                     $s =~ /^\s*#\s*?/ ||
1721                                     $s =~ /^\s*$Ident\s*:/) {
1722                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1723                                         if ($s =~ s/^.*?\n//) {
1724                                                 $cond_lines++;
1725                                         }
1726                                 }
1727                         }
1728
1729                         my (undef, $sindent) = line_stats("+" . $s);
1730                         my $stat_real = raw_line($linenr, $cond_lines);
1731
1732                         # Check if either of these lines are modified, else
1733                         # this is not this patch's fault.
1734                         if (!defined($stat_real) ||
1735                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1736                                 $check = 0;
1737                         }
1738                         if (defined($stat_real) && $cond_lines > 1) {
1739                                 $stat_real = "[...]\n$stat_real";
1740                         }
1741
1742                         #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";
1743
1744                         if ($check && (($sindent % 4) != 0 ||
1745                             ($sindent <= $indent && $s ne ''))) {
1746                                 WARN("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1747                         }
1748                 }
1749
1750                 # Track the 'values' across context and added lines.
1751                 my $opline = $line; $opline =~ s/^./ /;
1752                 my ($curr_values, $curr_vars) =
1753                                 annotate_values($opline . "\n", $prev_values);
1754                 $curr_values = $prev_values . $curr_values;
1755                 if ($dbg_values) {
1756                         my $outline = $opline; $outline =~ s/\t/ /g;
1757                         print "$linenr > .$outline\n";
1758                         print "$linenr > $curr_values\n";
1759                         print "$linenr >  $curr_vars\n";
1760                 }
1761                 $prev_values = substr($curr_values, -1);
1762
1763 #ignore lines not being added
1764                 if ($line=~/^[^\+]/) {next;}
1765
1766 # TEST: allow direct testing of the type matcher.
1767                 if ($dbg_type) {
1768                         if ($line =~ /^.\s*$Declare\s*$/) {
1769                                 ERROR("TEST: is type\n" . $herecurr);
1770                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1771                                 ERROR("TEST: is not type ($1 is)\n". $herecurr);
1772                         }
1773                         next;
1774                 }
1775 # TEST: allow direct testing of the attribute matcher.
1776                 if ($dbg_attr) {
1777                         if ($line =~ /^.\s*$Modifier\s*$/) {
1778                                 ERROR("TEST: is attr\n" . $herecurr);
1779                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1780                                 ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1781                         }
1782                         next;
1783                 }
1784
1785 # check for initialisation to aggregates open brace on the next line
1786                 if ($line =~ /^.\s*{/ &&
1787                     $prevline =~ /(?:^|[^=])=\s*$/) {
1788                         ERROR("that open brace { should be on the previous line\n" . $hereprev);
1789                 }
1790
1791 #
1792 # Checks which are anchored on the added line.
1793 #
1794
1795 # check for malformed paths in #include statements (uses RAW line)
1796                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1797                         my $path = $1;
1798                         if ($path =~ m{//}) {
1799                                 ERROR("malformed #include filename\n" .
1800                                         $herecurr);
1801                         }
1802                 }
1803
1804 # no C99 // comments
1805                 if ($line =~ m{//}) {
1806                         ERROR("do not use C99 // comments\n" . $herecurr);
1807                 }
1808                 # Remove C99 comments.
1809                 $line =~ s@//.*@@;
1810                 $opline =~ s@//.*@@;
1811
1812 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
1813 # the whole statement.
1814 #print "APW <$lines[$realline_next - 1]>\n";
1815                 if (defined $realline_next &&
1816                     exists $lines[$realline_next - 1] &&
1817                     !defined $suppress_export{$realline_next} &&
1818                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
1819                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
1820                         # Handle definitions which produce identifiers with
1821                         # a prefix:
1822                         #   XXX(foo);
1823                         #   EXPORT_SYMBOL(something_foo);
1824                         my $name = $1;
1825                         if ($stat =~ /^.([A-Z_]+)\s*\(\s*($Ident)/ &&
1826                             $name =~ /^${Ident}_$2/) {
1827 #print "FOO C name<$name>\n";
1828                                 $suppress_export{$realline_next} = 1;
1829
1830                         } elsif ($stat !~ /(?:
1831                                 \n.}\s*$|
1832                                 ^.DEFINE_$Ident\(\Q$name\E\)|
1833                                 ^.DECLARE_$Ident\(\Q$name\E\)|
1834                                 ^.LIST_HEAD\(\Q$name\E\)|
1835                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
1836                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
1837                             )/x) {
1838 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
1839                                 $suppress_export{$realline_next} = 2;
1840                         } else {
1841                                 $suppress_export{$realline_next} = 1;
1842                         }
1843                 }
1844                 if (!defined $suppress_export{$linenr} &&
1845                     $prevline =~ /^.\s*$/ &&
1846                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
1847                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
1848 #print "FOO B <$lines[$linenr - 1]>\n";
1849                         $suppress_export{$linenr} = 2;
1850                 }
1851                 if (defined $suppress_export{$linenr} &&
1852                     $suppress_export{$linenr} == 2) {
1853                         WARN("EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
1854                 }
1855
1856 # check for global initialisers.
1857                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
1858                         ERROR("do not initialise globals to 0 or NULL\n" .
1859                                 $herecurr);
1860                 }
1861 # check for static initialisers.
1862                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
1863                         ERROR("do not initialise statics to 0 or NULL\n" .
1864                                 $herecurr);
1865                 }
1866
1867 # * goes on variable not on type
1868                 # (char*[ const])
1869                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1870                         my ($from, $to) = ($1, $1);
1871
1872                         # Should start with a space.
1873                         $to =~ s/^(\S)/ $1/;
1874                         # Should not end with a space.
1875                         $to =~ s/\s+$//;
1876                         # '*'s should not have spaces between.
1877                         while ($to =~ s/\*\s+\*/\*\*/) {
1878                         }
1879
1880                         #print "from<$from> to<$to>\n";
1881                         if ($from ne $to) {
1882                                 ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
1883                         }
1884                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
1885                         my ($from, $to, $ident) = ($1, $1, $2);
1886
1887                         # Should start with a space.
1888                         $to =~ s/^(\S)/ $1/;
1889                         # Should not end with a space.
1890                         $to =~ s/\s+$//;
1891                         # '*'s should not have spaces between.
1892                         while ($to =~ s/\*\s+\*/\*\*/) {
1893                         }
1894                         # Modifiers should have spaces.
1895                         $to =~ s/(\b$Modifier$)/$1 /;
1896
1897                         #print "from<$from> to<$to> ident<$ident>\n";
1898                         if ($from ne $to && $ident !~ /^$Modifier$/) {
1899                                 ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
1900                         }
1901                 }
1902
1903 # # no BUG() or BUG_ON()
1904 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
1905 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
1906 #                       print "$herecurr";
1907 #                       $clean = 0;
1908 #               }
1909
1910                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
1911                         WARN("LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
1912                 }
1913
1914 # printk should use KERN_* levels.  Note that follow on printk's on the
1915 # same line do not need a level, so we use the current block context
1916 # to try and find and validate the current printk.  In summary the current
1917 # printk includes all preceding printk's which have no newline on the end.
1918 # we assume the first bad printk is the one to report.
1919                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
1920                         my $ok = 0;
1921                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
1922                                 #print "CHECK<$lines[$ln - 1]\n";
1923                                 # we have a preceding printk if it ends
1924                                 # with "\n" ignore it, else it is to blame
1925                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
1926                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
1927                                                 $ok = 1;
1928                                         }
1929                                         last;
1930                                 }
1931                         }
1932                         if ($ok == 0) {
1933                                 WARN("printk() should include KERN_ facility level\n" . $herecurr);
1934                         }
1935                 }
1936
1937 # function brace can't be on same line, except for #defines of do while,
1938 # or if closed on same line
1939                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
1940                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
1941                         ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
1942                 }
1943
1944 # open braces for enum, union and struct go on the same line.
1945                 if ($line =~ /^.\s*{/ &&
1946                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
1947                         ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
1948                 }
1949
1950 # missing space after union, struct or enum definition
1951                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
1952                     WARN("missing space after $1 definition\n" . $herecurr);
1953                 }
1954
1955 # check for spacing round square brackets; allowed:
1956 #  1. with a type on the left -- int [] a;
1957 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
1958 #  3. inside a curly brace -- = { [0...10] = 5 }
1959                 while ($line =~ /(.*?\s)\[/g) {
1960                         my ($where, $prefix) = ($-[1], $1);
1961                         if ($prefix !~ /$Type\s+$/ &&
1962                             ($where != 0 || $prefix !~ /^.\s+$/) &&
1963                             $prefix !~ /{\s+$/) {
1964                                 ERROR("space prohibited before open square bracket '['\n" . $herecurr);
1965                         }
1966                 }
1967
1968 # check for spaces between functions and their parentheses.
1969                 while ($line =~ /($Ident)\s+\(/g) {
1970                         my $name = $1;
1971                         my $ctx_before = substr($line, 0, $-[1]);
1972                         my $ctx = "$ctx_before$name";
1973
1974                         # Ignore those directives where spaces _are_ permitted.
1975                         if ($name =~ /^(?:
1976                                 if|for|while|switch|return|case|
1977                                 volatile|__volatile__|
1978                                 __attribute__|format|__extension__|
1979                                 asm|__asm__)$/x)
1980                         {
1981
1982                         # Ignore 'catch (...)' in C++
1983                         } elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {
1984
1985                         # cpp #define statements have non-optional spaces, ie
1986                         # if there is a space between the name and the open
1987                         # parenthesis it is simply not a parameter group.
1988                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
1989
1990                         # cpp #elif statement condition may start with a (
1991                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
1992
1993                         # If this whole things ends with a type its most
1994                         # likely a typedef for a function.
1995                         } elsif ($ctx =~ /$Type$/) {
1996
1997                         } else {
1998                                 WARN("space prohibited between function name and open parenthesis '('\n" . $herecurr);
1999                         }
2000                 }
2001 # Check operator spacing.
2002                 if (!($line=~/\#\s*include/)) {
2003                         my $ops = qr{
2004                                 <<=|>>=|<=|>=|==|!=|
2005                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2006                                 =>|->|<<|>>|<|>|=|!|~|
2007                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2008                                 \?|::|:
2009                         }x;
2010                         my @elements = split(/($ops|;)/, $opline);
2011                         my $off = 0;
2012
2013                         my $blank = copy_spacing($opline);
2014
2015                         for (my $n = 0; $n < $#elements; $n += 2) {
2016                                 $off += length($elements[$n]);
2017
2018                                 # Pick up the preceding and succeeding characters.
2019                                 my $ca = substr($opline, 0, $off);
2020                                 my $cc = '';
2021                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2022                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2023                                 }
2024                                 my $cb = "$ca$;$cc";
2025
2026                                 my $a = '';
2027                                 $a = 'V' if ($elements[$n] ne '');
2028                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2029                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2030                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2031                                 $a = 'O' if ($elements[$n] eq '');
2032                                 $a = 'E' if ($ca =~ /^\s*$/);
2033
2034                                 my $op = $elements[$n + 1];
2035
2036                                 my $c = '';
2037                                 if (defined $elements[$n + 2]) {
2038                                         $c = 'V' if ($elements[$n + 2] ne '');
2039                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2040                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2041                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2042                                         $c = 'O' if ($elements[$n + 2] eq '');
2043                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2044                                 } else {
2045                                         $c = 'E';
2046                                 }
2047
2048                                 my $ctx = "${a}x${c}";
2049
2050                                 my $at = "(ctx:$ctx)";
2051
2052                                 my $ptr = substr($blank, 0, $off) . "^";
2053                                 my $hereptr = "$hereline$ptr\n";
2054
2055                                 # Pull out the value of this operator.
2056                                 my $op_type = substr($curr_values, $off + 1, 1);
2057
2058                                 # Get the full operator variant.
2059                                 my $opv = $op . substr($curr_vars, $off, 1);
2060
2061                                 # Ignore operators passed as parameters.
2062                                 if ($op_type ne 'V' &&
2063                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2064
2065 #                               # Ignore comments
2066 #                               } elsif ($op =~ /^$;+$/) {
2067
2068                                 # ; should have either the end of line or a space or \ after it
2069                                 } elsif ($op eq ';') {
2070                                         if ($ctx !~ /.x[WEBC]/ &&
2071                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2072                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2073                                         }
2074
2075                                 # // is a comment
2076                                 } elsif ($op eq '//') {
2077
2078                                 # Ignore : used in class declaration in C++
2079                                 } elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
2080                                                  $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {
2081
2082                                 # No spaces for:
2083                                 #   ->
2084                                 #   :   when part of a bitfield
2085                                 } elsif ($op eq '->' || $opv eq ':B') {
2086                                         if ($ctx =~ /Wx.|.xW/) {
2087                                                 ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2088                                         }
2089
2090                                 # , must have a space on the right.
2091                                 # not required when having a single },{ on one line
2092                                 } elsif ($op eq ',') {
2093                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
2094                                             ($elements[$n] . $elements[$n + 2]) !~ " *}{") {
2095                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2096                                         }
2097
2098                                 # '*' as part of a type definition -- reported already.
2099                                 } elsif ($opv eq '*_') {
2100                                         #warn "'*' is part of type\n";
2101
2102                                 # unary operators should have a space before and
2103                                 # none after.  May be left adjacent to another
2104                                 # unary operator, or a cast
2105                                 } elsif ($op eq '!' || $op eq '~' ||
2106                                          $opv eq '*U' || $opv eq '-U' ||
2107                                          $opv eq '&U' || $opv eq '&&U') {
2108                                         if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
2109                                                 # '~' used as a name of Destructor
2110
2111                                         } elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2112                                                 ERROR("space required before that '$op' $at\n" . $hereptr);
2113                                         }
2114                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2115                                                 # A unary '*' may be const
2116
2117                                         } elsif ($ctx =~ /.xW/) {
2118                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2119                                         }
2120
2121                                 # unary ++ and unary -- are allowed no space on one side.
2122                                 } elsif ($op eq '++' or $op eq '--') {
2123                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2124                                                 ERROR("space required one side of that '$op' $at\n" . $hereptr);
2125                                         }
2126                                         if ($ctx =~ /Wx[BE]/ ||
2127                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2128                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2129                                         }
2130                                         if ($ctx =~ /ExW/) {
2131                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2132                                         }
2133
2134
2135                                 # << and >> may either have or not have spaces both sides
2136                                 } elsif ($op eq '<<' or $op eq '>>' or
2137                                          $op eq '&' or $op eq '^' or $op eq '|' or
2138                                          $op eq '+' or $op eq '-' or
2139                                          $op eq '*' or $op eq '/' or
2140                                          $op eq '%')
2141                                 {
2142                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2143                                                 ERROR("need consistent spacing around '$op' $at\n" .
2144                                                         $hereptr);
2145                                         }
2146
2147                                 # A colon needs no spaces before when it is
2148                                 # terminating a case value or a label.
2149                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2150                                         if ($ctx =~ /Wx./) {
2151                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2152                                         }
2153
2154                                 # All the others need spaces both sides.
2155                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2156                                         my $ok = 0;
2157
2158                                         if ($realfile =~ /\.cpp|\.h$/) {
2159                                                 # Ignore template arguments <...> in C++
2160                                                 if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
2161                                                         $ok = 1;
2162                                                 }
2163
2164                                                 # Ignore :: in C++
2165                                                 if ($op eq '::') {
2166                                                         $ok = 1;
2167                                                 }
2168                                         }
2169
2170                                         # Ignore email addresses <foo@bar>
2171                                         if (($op eq '<' &&
2172                                              $cc =~ /^\S+\@\S+>/) ||
2173                                             ($op eq '>' &&
2174                                              $ca =~ /<\S+\@\S+$/))
2175                                         {
2176                                                 $ok = 1;
2177                                         }
2178
2179                                         # Ignore ?:
2180                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2181                                             ($op eq '?' && $cc =~ /^:/)) {
2182                                                 $ok = 1;
2183                                         }
2184
2185                                         if ($ok == 0) {
2186                                                 ERROR("spaces required around that '$op' $at\n" . $hereptr);
2187                                         }
2188                                 }
2189                                 $off += length($elements[$n + 1]);
2190                         }
2191                 }
2192
2193 # check for multiple assignments
2194                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2195                         CHK("multiple assignments should be avoided\n" . $herecurr);
2196                 }
2197
2198 ## # check for multiple declarations, allowing for a function declaration
2199 ## # continuation.
2200 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2201 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2202 ##
2203 ##                      # Remove any bracketed sections to ensure we do not
2204 ##                      # falsly report the parameters of functions.
2205 ##                      my $ln = $line;
2206 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2207 ##                      }
2208 ##                      if ($ln =~ /,/) {
2209 ##                              WARN("declaring multiple variables together should be avoided\n" . $herecurr);
2210 ##                      }
2211 ##              }
2212
2213 #need space before brace following if, while, etc
2214                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2215                     $line =~ /do{/) {
2216                         ERROR("space required before the open brace '{'\n" . $herecurr);
2217                 }
2218
2219 # closing brace should have a space following it when it has anything
2220 # on the line
2221                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2222                         ERROR("space required after that close brace '}'\n" . $herecurr);
2223                 }
2224
2225 # check spacing on square brackets
2226                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2227                         ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2228                 }
2229                 if ($line =~ /\s\]/) {
2230                         ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2231                 }
2232
2233 # check spacing on parentheses
2234                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2235                     $line !~ /for\s*\(\s+;/) {
2236                         ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2237                 }
2238                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2239                     $line !~ /for\s*\(.*;\s+\)/ &&
2240                     $line !~ /:\s+\)/) {
2241                         ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2242                 }
2243
2244 # Return is not a function.
2245                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2246                         my $spacing = $1;
2247                         my $value = $2;
2248
2249                         # Flatten any parentheses
2250                         $value =~ s/\(/ \(/g;
2251                         $value =~ s/\)/\) /g;
2252                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2253                                $value !~ /(?:$Ident|-?$Constant)\s*
2254                                              $Compare\s*
2255                                              (?:$Ident|-?$Constant)/x &&
2256                                $value =~ s/\([^\(\)]*\)/1/) {
2257                         }
2258 #print "value<$value>\n";
2259                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2260                                 ERROR("return is not a function, parentheses are not required\n" . $herecurr);
2261
2262                         } elsif ($spacing !~ /\s+/) {
2263                                 ERROR("space required before the open parenthesis '('\n" . $herecurr);
2264                         }
2265                 }
2266 # Return of what appears to be an errno should normally be -'ve
2267                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2268                         my $name = $1;
2269                         if ($name ne 'EOF' && $name ne 'ERROR') {
2270                                 CHK("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2271                         }
2272                 }
2273
2274 # Need a space before open parenthesis after if, while etc
2275                 if ($line=~/\b(if|while|for|switch)\(/) {
2276                         ERROR("space required before the open parenthesis '('\n" . $herecurr);
2277                 }
2278
2279 # Check for illegal assignment in if conditional -- and check for trailing
2280 # statements after the conditional.
2281                 if ($line =~ /do\s*(?!{)/) {
2282                         my ($stat_next) = ctx_statement_block($line_nr_next,
2283                                                 $remain_next, $off_next);
2284                         $stat_next =~ s/\n./\n /g;
2285                         ##print "stat<$stat> stat_next<$stat_next>\n";
2286
2287                         if ($stat_next =~ /^\s*while\b/) {
2288                                 # If the statement carries leading newlines,
2289                                 # then count those as offsets.
2290                                 my ($whitespace) =
2291                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2292                                 my $offset =
2293                                         statement_rawlines($whitespace) - 1;
2294
2295                                 $suppress_whiletrailers{$line_nr_next +
2296                                                                 $offset} = 1;
2297                         }
2298                 }
2299                 if (!defined $suppress_whiletrailers{$linenr} &&
2300                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2301                         my ($s, $c) = ($stat, $cond);
2302
2303                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2304                                 ERROR("do not use assignment in if condition\n" . $herecurr);
2305                         }
2306
2307                         # Find out what is on the end of the line after the
2308                         # conditional.
2309                         substr($s, 0, length($c), '');
2310                         $s =~ s/\n.*//g;
2311                         $s =~ s/$;//g;  # Remove any comments
2312                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2313                             $c !~ /}\s*while\s*/)
2314                         {
2315                                 # Find out how long the conditional actually is.
2316                                 my @newlines = ($c =~ /\n/gs);
2317                                 my $cond_lines = 1 + $#newlines;
2318                                 my $stat_real = '';
2319
2320                                 $stat_real = raw_line($linenr, $cond_lines)
2321                                                         . "\n" if ($cond_lines);
2322                                 if (defined($stat_real) && $cond_lines > 1) {
2323                                         $stat_real = "[...]\n$stat_real";
2324                                 }
2325
2326                                 ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2327                         }
2328                 }
2329
2330 # Check for bitwise tests written as boolean
2331                 if ($line =~ /
2332                         (?:
2333                                 (?:\[|\(|\&\&|\|\|)
2334                                 \s*0[xX][0-9]+\s*
2335                                 (?:\&\&|\|\|)
2336                         |
2337                                 (?:\&\&|\|\|)
2338                                 \s*0[xX][0-9]+\s*
2339                                 (?:\&\&|\|\||\)|\])
2340                         )/x)
2341                 {
2342                         WARN("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2343                 }
2344
2345 # if and else should not have general statements after it
2346                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2347                         my $s = $1;
2348                         $s =~ s/$;//g;  # Remove any comments
2349                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2350                                 ERROR("trailing statements should be on next line\n" . $herecurr);
2351                         }
2352                 }
2353 # if should not continue a brace
2354                 if ($line =~ /}\s*if\b/) {
2355                         ERROR("trailing statements should be on next line\n" .
2356                                 $herecurr);
2357                 }
2358 # case and default should not have general statements after them
2359                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2360                     $line !~ /\G(?:
2361                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2362                         \s*return\s+
2363                     )/xg)
2364                 {
2365                         ERROR("trailing statements should be on next line\n" . $herecurr);
2366                 }
2367
2368                 # Check for }<nl>else {, these must be at the same
2369                 # indent level to be relevant to each other.
2370                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2371                                                 $previndent == $indent) {
2372                         ERROR("else should follow close brace '}'\n" . $hereprev);
2373                 }
2374
2375                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2376                                                 $previndent == $indent) {
2377                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2378
2379                         # Find out what is on the end of the line after the
2380                         # conditional.
2381                         substr($s, 0, length($c), '');
2382                         $s =~ s/\n.*//g;
2383
2384                         if ($s =~ /^\s*;/) {
2385                                 ERROR("while should follow close brace '}'\n" . $hereprev);
2386                         }
2387                 }
2388
2389 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2390 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2391 #                   print "No studly caps, use _\n";
2392 #                   print "$herecurr";
2393 #                   $clean = 0;
2394 #               }
2395
2396 #no spaces allowed after \ in define
2397                 if ($line=~/\#\s*define.*\\\s$/) {
2398                         WARN("Whitepspace after \\ makes next lines useless\n" . $herecurr);
2399                 }
2400
2401 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2402                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2403                         my $file = "$1.h";
2404                         my $checkfile = "include/linux/$file";
2405                         if (-f "$root/$checkfile" &&
2406                             $realfile ne $checkfile &&
2407                             $1 !~ /$allowed_asm_includes/)
2408                         {
2409                                 if ($realfile =~ m{^arch/}) {
2410                                         CHK("Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2411                                 } else {
2412                                         WARN("Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2413                                 }
2414                         }
2415                 }
2416
2417 # multi-statement macros should be enclosed in a do while loop, grab the
2418 # first statement and ensure its the whole macro if its not enclosed
2419 # in a known good container
2420                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2421                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2422                         my $ln = $linenr;
2423                         my $cnt = $realcnt;
2424                         my ($off, $dstat, $dcond, $rest);
2425                         my $ctx = '';
2426
2427                         my $args = defined($1);
2428
2429                         # Find the end of the macro and limit our statement
2430                         # search to that.
2431                         while ($cnt > 0 && defined $lines[$ln - 1] &&
2432                                 $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2433                         {
2434                                 $ctx .= $rawlines[$ln - 1] . "\n";
2435                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2436                                 $ln++;
2437                         }
2438                         $ctx .= $rawlines[$ln - 1];
2439
2440                         ($dstat, $dcond, $ln, $cnt, $off) =
2441                                 ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2442                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2443                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2444
2445                         # Extract the remainder of the define (if any) and
2446                         # rip off surrounding spaces, and trailing \'s.
2447                         $rest = '';
2448                         while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2449                                 #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2450                                 if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2451                                         $rest .= substr($lines[$ln - 1], $off) . "\n";
2452                                         $cnt--;
2453                                 }
2454                                 $ln++;
2455                                 $off = 0;
2456                         }
2457                         $rest =~ s/\\\n.//g;
2458                         $rest =~ s/^\s*//s;
2459                         $rest =~ s/\s*$//s;
2460
2461                         # Clean up the original statement.
2462                         if ($args) {
2463                                 substr($dstat, 0, length($dcond), '');
2464                         } else {
2465                                 $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2466                         }
2467                         $dstat =~ s/$;//g;
2468                         $dstat =~ s/\\\n.//g;
2469                         $dstat =~ s/^\s*//s;
2470                         $dstat =~ s/\s*$//s;
2471
2472                         # Flatten any parentheses and braces
2473                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2474                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2475                                $dstat =~ s/\[[^\{\}]*\]/1/)
2476                         {
2477                         }
2478
2479                         my $exceptions = qr{
2480                                 $Declare|
2481                                 module_param_named|
2482                                 MODULE_PARAM_DESC|
2483                                 DECLARE_PER_CPU|
2484                                 DEFINE_PER_CPU|
2485                                 __typeof__\(|
2486                                 union|
2487                                 struct|
2488                                 \.$Ident\s*=\s*|
2489                                 ^\"|\"$
2490                         }x;
2491                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2492                         if ($rest ne '' && $rest ne ',') {
2493                                 if ($rest !~ /while\s*\(/ &&
2494                                     $dstat !~ /$exceptions/)
2495                                 {
2496                                         ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2497                                 }
2498
2499                         } elsif ($ctx !~ /;/) {
2500                                 if ($dstat ne '' &&
2501                                     $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2502                                     $dstat !~ /$exceptions/ &&
2503                                     $dstat !~ /^\.$Ident\s*=/ &&
2504                                     $dstat =~ /$Operators/)
2505                                 {
2506                                         ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2507                                 }
2508                         }
2509                 }
2510
2511 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
2512 # all assignments may have only one of the following with an assignment:
2513 #       .
2514 #       ALIGN(...)
2515 #       VMLINUX_SYMBOL(...)
2516                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
2517                         WARN("vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
2518                 }
2519
2520 # check for missing bracing round if etc
2521                 if ($line =~ /(^.*)\bif\b/ && $line !~ /\#\s*if/) {
2522                         my ($level, $endln, @chunks) =
2523                                 ctx_statement_full($linenr, $realcnt, 1);
2524                         if ($dbg_adv_apw) {
2525                             print "APW: chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2526                             print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n"
2527                                 if $#chunks >= 1;
2528                         }
2529                         if ($#chunks >= 0 && $level == 0) {
2530                                 my $allowed = 0;
2531                                 my $seen = 0;
2532                                 my $herectx = $here . "\n";
2533                                 my $ln = $linenr - 1;
2534                                 for my $chunk (@chunks) {
2535                                         my ($cond, $block) = @{$chunk};
2536
2537                                         # If the condition carries leading newlines, then count those as offsets.
2538                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2539                                         my $offset = statement_rawlines($whitespace) - 1;
2540
2541                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2542
2543                                         # We have looked at and allowed this specific line.
2544                                         $suppress_ifbraces{$ln + $offset} = 1;
2545
2546                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2547                                         $ln += statement_rawlines($block) - 1;
2548
2549                                         substr($block, 0, length($cond), '');
2550
2551                                         my $spaced_block = $block;
2552                                         $spaced_block =~ s/\n\+/ /g;
2553
2554                                         $seen++ if ($spaced_block =~ /^\s*{/);
2555
2556                                         print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
2557                                             if $dbg_adv_apw;
2558                                         if (statement_lines($cond) > 1) {
2559                                             print "APW: ALLOWED: cond<$cond>\n"
2560                                                 if $dbg_adv_apw;
2561                                             $allowed = 1;
2562                                         }
2563                                         if ($block =~/\b(?:if|for|while)\b/) {
2564                                             print "APW: ALLOWED: block<$block>\n"
2565                                                 if $dbg_adv_apw;
2566                                             $allowed = 1;
2567                                         }
2568                                         if (statement_block_size($block) > 1) {
2569                                             print "APW: ALLOWED: lines block<$block>\n"
2570                                                 if $dbg_adv_apw;
2571                                             $allowed = 1;
2572                                         }
2573                                 }
2574                                 if ($seen != ($#chunks + 1)) {
2575                                         WARN("braces {} are necessary for all arms of this statement\n" . $herectx);
2576                                 }
2577                         }
2578                 }
2579                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2580                                         $line =~ /\b(if|while|for|else)\b/ &&
2581                                         $line !~ /\#\s*if/ &&
2582                                         $line !~ /\#\s*else/) {
2583                         my $allowed = 0;
2584
2585                         # Check the pre-context.
2586                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2587                             my $pre = $1;
2588
2589                             if ($line !~ /else/) {
2590                                 print "APW: ALLOWED: pre<$pre> line<$line>\n"
2591                                     if $dbg_adv_apw;
2592                                 $allowed = 1;
2593                             }
2594                         }
2595
2596                         my ($level, $endln, @chunks) =
2597                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2598
2599                         # Check the condition.
2600                         my ($cond, $block) = @{$chunks[0]};
2601                         print "CHECKING<$linenr> cond<$cond> block<$block>\n"
2602                             if $dbg_adv_checking;
2603                         if (defined $cond) {
2604                                 substr($block, 0, length($cond), '');
2605                         }
2606                         if (statement_lines($cond) > 1) {
2607                             print "APW: ALLOWED: cond<$cond>\n"
2608                                 if $dbg_adv_apw;
2609                             $allowed = 1;
2610                         }
2611                         if ($block =~/\b(?:if|for|while)\b/) {
2612                             print "APW: ALLOWED: block<$block>\n"
2613                                 if $dbg_adv_apw;
2614                             $allowed = 1;
2615                         }
2616                         if (statement_block_size($block) > 1) {
2617                             print "APW: ALLOWED: lines block<$block>\n"
2618                                 if $dbg_adv_apw;
2619                             $allowed = 1;
2620                         }
2621                         # Check the post-context.
2622                         if (defined $chunks[1]) {
2623                                 my ($cond, $block) = @{$chunks[1]};
2624                                 if (defined $cond) {
2625                                         substr($block, 0, length($cond), '');
2626                                 }
2627                                 if ($block =~ /^\s*\{/) {
2628                                     print "APW: ALLOWED: chunk-1 block<$block>\n"
2629                                         if $dbg_adv_apw;
2630                                     $allowed = 1;
2631                                 }
2632                         }
2633                         print "DCS: level=$level block<$block> allowed=$allowed\n"
2634                             if $dbg_adv_dcs;
2635                         if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2636                                 my $herectx = $here . "\n";;
2637                                 my $cnt = statement_rawlines($block);
2638
2639                                 for (my $n = 0; $n < $cnt; $n++) {
2640                                         $herectx .= raw_line($linenr, $n) . "\n";;
2641                                 }
2642
2643                                 WARN("braces {} are necessary even for single statement blocks\n" . $herectx);
2644                         }
2645                 }
2646
2647 # don't include deprecated include files (uses RAW line)
2648                 for my $inc (@dep_includes) {
2649                         if ($rawline =~ m@^.\s*\#\s*include\s*\<$inc>@) {
2650                                 ERROR("Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2651                         }
2652                 }
2653
2654 # don't use deprecated functions
2655                 for my $func (@dep_functions) {
2656                         if ($line =~ /\b$func\b/) {
2657                                 ERROR("Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2658                         }
2659                 }
2660
2661 # no volatiles please
2662                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2663                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2664                         WARN("Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
2665                 }
2666
2667 # SPIN_LOCK_UNLOCKED & RW_LOCK_UNLOCKED are deprecated
2668                 if ($line =~ /\b(SPIN_LOCK_UNLOCKED|RW_LOCK_UNLOCKED)/) {
2669                         ERROR("Use of $1 is deprecated: see Documentation/spinlocks.txt\n" . $herecurr);
2670                 }
2671
2672 # warn about #if 0
2673                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2674                         CHK("if this code is redundant consider removing it\n" .
2675                                 $herecurr);
2676                 }
2677
2678 # check for needless kfree() checks
2679                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2680                         my $expr = $1;
2681                         if ($line =~ /\bkfree\(\Q$expr\E\);/) {
2682                                 WARN("kfree(NULL) is safe this check is probably not required\n" . $hereprev);
2683                         }
2684                 }
2685 # check for needless usb_free_urb() checks
2686                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2687                         my $expr = $1;
2688                         if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
2689                                 WARN("usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
2690                         }
2691                 }
2692
2693 # prefer usleep_range over udelay
2694                 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
2695                         # ignore udelay's < 10, however
2696                         if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
2697                                 CHK("usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
2698                         }
2699                 }
2700
2701 # warn about unexpectedly long msleep's
2702                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
2703                         if ($1 < 20) {
2704                                 WARN("msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
2705                         }
2706                 }
2707
2708 # warn about #ifdefs in C files
2709 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
2710 #                       print "#ifdef in C files should be avoided\n";
2711 #                       print "$herecurr";
2712 #                       $clean = 0;
2713 #               }
2714
2715 # warn about spacing in #ifdefs
2716                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
2717                         ERROR("exactly one space required after that #$1\n" . $herecurr);
2718                 }
2719
2720 # check for spinlock_t definitions without a comment.
2721                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
2722                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
2723                         my $which = $1;
2724                         if (!ctx_has_comment($first_line, $linenr)) {
2725                                 CHK("$1 definition without comment\n" . $herecurr);
2726                         }
2727                 }
2728 # check for memory barriers without a comment.
2729                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
2730                         if (!ctx_has_comment($first_line, $linenr)) {
2731                                 CHK("memory barrier without comment\n" . $herecurr);
2732                         }
2733                 }
2734 # check of hardware specific defines
2735                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
2736                         CHK("architecture specific defines should be avoided\n" .  $herecurr);
2737                 }
2738
2739 # Check that the storage class is at the beginning of a declaration
2740                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2741                         WARN("storage class should be at the beginning of the declaration\n" . $herecurr)
2742                 }
2743
2744 # check the location of the inline attribute, that it is between
2745 # storage class and type.
2746                 if ($line =~ /\b$Type\s+$Inline\b/ ||
2747                     $line =~ /\b$Inline\s+$Storage\b/) {
2748                         ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2749                 }
2750
2751 # Check for __inline__ and __inline, prefer inline
2752                 if ($line =~ /\b(__inline__|__inline)\b/) {
2753                         WARN("plain inline is preferred over $1\n" . $herecurr);
2754                 }
2755
2756 # check for sizeof(&)
2757                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
2758                         WARN("sizeof(& should be avoided\n" . $herecurr);
2759                 }
2760
2761 # check for new externs in .c files.
2762                 if ($realfile =~ /\.c$/ && defined $stat &&
2763                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2764                 {
2765                         my $function_name = $1;
2766                         my $paren_space = $2;
2767
2768                         my $s = $stat;
2769                         if (defined $cond) {
2770                                 substr($s, 0, length($cond), '');
2771                         }
2772                         if ($s =~ /^\s*;/ &&
2773                             $function_name ne 'uninitialized_var')
2774                         {
2775                                 WARN("externs should be avoided in .c files\n" .  $herecurr);
2776                         }
2777
2778                         if ($paren_space =~ /\n/) {
2779                                 WARN("arguments for function declarations should follow identifier\n" . $herecurr);
2780                         }
2781
2782                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
2783                     $stat =~ /^.\s*extern\s+/)
2784                 {
2785                         WARN("externs should be avoided in .c files\n" .  $herecurr);
2786                 }
2787
2788 # checks for new __setup's
2789                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
2790                         my $name = $1;
2791
2792                         if (!grep(/$name/, @setup_docs)) {
2793                                 CHK("__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
2794                         }
2795                 }
2796
2797 # check for pointless casting of kmalloc return
2798                 if ($line =~ /\*\s*\)\s*k[czm]alloc\b/) {
2799                         WARN("unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
2800                 }
2801
2802 # check for gcc specific __FUNCTION__
2803                 if ($line =~ /__FUNCTION__/) {
2804                         WARN("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2805                 }
2806
2807 # check for semaphores used as mutexes
2808                 if ($line =~ /^.\s*(DECLARE_MUTEX|init_MUTEX)\s*\(/) {
2809                         WARN("mutexes are preferred for single holder semaphores\n" . $herecurr);
2810                 }
2811 # check for semaphores used as mutexes
2812                 if ($line =~ /^.\s*init_MUTEX_LOCKED\s*\(/) {
2813                         WARN("consider using a completion\n" . $herecurr);
2814
2815                 }
2816 # recommend strict_strto* over simple_strto*
2817                 if ($line =~ /\bsimple_(strto.*?)\s*\(/) {
2818                         WARN("consider using strict_$1 in preference to simple_$1\n" . $herecurr);
2819                 }
2820 # check for __initcall(), use device_initcall() explicitly please
2821                 if ($line =~ /^.\s*__initcall\s*\(/) {
2822                         WARN("please use device_initcall() instead of __initcall()\n" . $herecurr);
2823                 }
2824 # check for various ops structs, ensure they are const.
2825                 my $struct_ops = qr{acpi_dock_ops|
2826                                 address_space_operations|
2827                                 backlight_ops|
2828                                 block_device_operations|
2829                                 dentry_operations|
2830                                 dev_pm_ops|
2831                                 dma_map_ops|
2832                                 extent_io_ops|
2833                                 file_lock_operations|
2834                                 file_operations|
2835                                 hv_ops|
2836                                 ide_dma_ops|
2837                                 intel_dvo_dev_ops|
2838                                 item_operations|
2839                                 iwl_ops|
2840                                 kgdb_arch|
2841                                 kgdb_io|
2842                                 kset_uevent_ops|
2843                                 lock_manager_operations|
2844                                 microcode_ops|
2845                                 mtrr_ops|
2846                                 neigh_ops|
2847                                 nlmsvc_binding|
2848                                 pci_raw_ops|
2849                                 pipe_buf_operations|
2850                                 platform_hibernation_ops|
2851                                 platform_suspend_ops|
2852                                 proto_ops|
2853                                 rpc_pipe_ops|
2854                                 seq_operations|
2855                                 snd_ac97_build_ops|
2856                                 soc_pcmcia_socket_ops|
2857                                 stacktrace_ops|
2858                                 sysfs_ops|
2859                                 tty_operations|
2860                                 usb_mon_operations|
2861                                 wd_ops}x;
2862                 if ($line !~ /\bconst\b/ &&
2863                     $line =~ /\bstruct\s+($struct_ops)\b/) {
2864                         WARN("struct $1 should normally be const\n" .
2865                                 $herecurr);
2866                 }
2867
2868 # use of NR_CPUS is usually wrong
2869 # ignore definitions of NR_CPUS and usage to define arrays as likely right
2870                 if ($line =~ /\bNR_CPUS\b/ &&
2871                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
2872                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
2873                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
2874                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
2875                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
2876                 {
2877                         WARN("usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
2878                 }
2879
2880 # check for %L{u,d,i} in strings
2881                 my $string;
2882                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2883                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
2884                         $string =~ s/%%/__/g;
2885                         if ($string =~ /(?<!%)%L[udi]/) {
2886                                 WARN("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2887                                 last;
2888                         }
2889                 }
2890
2891 # whine mightly about in_atomic
2892                 if ($line =~ /\bin_atomic\s*\(/) {
2893                         if ($realfile =~ m@^drivers/@) {
2894                                 ERROR("do not use in_atomic in drivers\n" . $herecurr);
2895                         } elsif ($realfile !~ m@^kernel/@) {
2896                                 WARN("use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
2897                         }
2898                 }
2899
2900 # check for lockdep_set_novalidate_class
2901                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
2902                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
2903                         if ($realfile !~ m@^kernel/lockdep@ &&
2904                             $realfile !~ m@^include/linux/lockdep@ &&
2905                             $realfile !~ m@^drivers/base/core@) {
2906                                 ERROR("lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
2907                         }
2908                 }
2909
2910 # QEMU specific tests
2911                 if ($rawline =~ /\b(?:Qemu|QEmu)\b/) {
2912                         WARN("use QEMU instead of Qemu or QEmu\n" . $herecurr);
2913                 }
2914
2915 # check for non-portable ffs() calls that have portable alternatives in QEMU
2916                 if ($line =~ /\bffs\(/) {
2917                         ERROR("use ctz32() instead of ffs()\n" . $herecurr);
2918                 }
2919                 if ($line =~ /\bffsl\(/) {
2920                         ERROR("use ctz32() or ctz64() instead of ffsl()\n" . $herecurr);
2921                 }
2922                 if ($line =~ /\bffsll\(/) {
2923                         ERROR("use ctz64() instead of ffsll()\n" . $herecurr);
2924                 }
2925         }
2926
2927         # If we have no input at all, then there is nothing to report on
2928         # so just keep quiet.
2929         if ($#rawlines == -1) {
2930                 exit(0);
2931         }
2932
2933         # In mailback mode only produce a report in the negative, for
2934         # things that appear to be patches.
2935         if ($mailback && ($clean == 1 || !$is_patch)) {
2936                 exit(0);
2937         }
2938
2939         # This is not a patch, and we are are in 'no-patch' mode so
2940         # just keep quiet.
2941         if (!$chk_patch && !$is_patch) {
2942                 exit(0);
2943         }
2944
2945         if (!$is_patch) {
2946                 ERROR("Does not appear to be a unified-diff format patch\n");
2947         }
2948         if ($is_patch && $chk_signoff && $signoff == 0) {
2949                 ERROR("Missing Signed-off-by: line(s)\n");
2950         }
2951
2952         print report_dump();
2953         if ($summary && !($clean == 1 && $quiet == 1)) {
2954                 print "$filename " if ($summary_file);
2955                 print "total: $cnt_error errors, $cnt_warn warnings, " .
2956                         (($check)? "$cnt_chk checks, " : "") .
2957                         "$cnt_lines lines checked\n";
2958                 print "\n" if ($quiet == 0);
2959         }
2960
2961         if ($quiet == 0) {
2962                 # If there were whitespace errors which cleanpatch can fix
2963                 # then suggest that.
2964 #               if ($rpt_cleaners) {
2965 #                       print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
2966 #                       print "      scripts/cleanfile\n\n";
2967 #               }
2968         }
2969
2970         if ($clean == 1 && $quiet == 0) {
2971                 print "$vname has no obvious style problems and is ready for submission.\n"
2972         }
2973         if ($clean == 0 && $quiet == 0) {
2974                 print "$vname has style problems, please review.  If any of these errors\n";
2975                 print "are false positives report them to the maintainer, see\n";
2976                 print "CHECKPATCH in MAINTAINERS.\n";
2977         }
2978
2979         return $clean;
2980 }