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) 2008,2009, 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 = '0.30';
  14
  15 use Getopt::Long qw(:config no_auto_abbrev);
  16
  17 my $quiet = 0;
  18 my $tree = 1;
  19 my $chk_signoff = 1;
  20 my $chk_patch = 1;
  21 my $tst_only;
  22 my $emacs = 0;
  23 my $terse = 0;
  24 my $file = 0;
  25 my $check = 0;
  26 my $summary = 1;
  27 my $mailback = 0;
  28 my $summary_file = 0;
  29 my $root;
  30 my %debug;
  31 my $help = 0;
  32
  33 sub help {
  34         my ($exitcode) = @_;
  35
  36         print << "EOM";
  37 Usage: $P [OPTION]... [FILE]...
  38 Version: $V
  39
  40 Options:
  41   -q, --quiet                quiet
  42   --no-tree                  run without a kernel tree
  43   --no-signoff               do not check for 'Signed-off-by' line
  44   --patch                    treat FILE as patchfile (default)
  45   --emacs                    emacs compile window format
  46   --terse                    one line per report
  47   -f, --file                 treat FILE as regular source file
  48   --subjective, --strict     enable more subjective tests
  49   --root=PATH                PATH to the kernel tree root
  50   --no-summary               suppress the per-file summary
  51   --mailback                 only produce a report in case of warnings/errors
  52   --summary-file             include the filename in summary
  53   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  54                              'values', 'possible', 'type', and 'attr' (default
  55                              is all off)
  56   --test-only=WORD           report only warnings/errors containing WORD
  57                              literally
  58   -h, --help, --version      display this help and exit
  59
  60 When FILE is - read standard input.
  61 EOM
  62
  63         exit($exitcode);
  64 }
  65
  66 GetOptions(
  67         'q|quiet+'      => \$quiet,
  68         'tree!'         => \$tree,
  69         'signoff!'      => \$chk_signoff,
  70         'patch!'        => \$chk_patch,
  71         'emacs!'        => \$emacs,
  72         'terse!'        => \$terse,
  73         'f|file!'       => \$file,
  74         'subjective!'   => \$check,
  75         'strict!'       => \$check,
  76         'root=s'        => \$root,
  77         'summary!'      => \$summary,
  78         'mailback!'     => \$mailback,
  79         'summary-file!' => \$summary_file,
  80
  81         'debug=s'       => \%debug,
  82         'test-only=s'   => \$tst_only,
  83         'h|help'        => \$help,
  84         'version'       => \$help
  85 ) or help(1);
  86
  87 help(0) if ($help);
  88
  89 my $exit = 0;
  90
  91 if ($#ARGV < 0) {
  92         print "$P: no input files\n";
  93         exit(1);
  94 }
  95
  96 my $dbg_values = 0;
  97 my $dbg_possible = 0;
  98 my $dbg_type = 0;
  99 my $dbg_attr = 0;
 100 for my $key (keys %debug) {
 101         ## no critic
 102         eval "\${dbg_$key} = '$debug{$key}';";
 103         die "$@" if ($@);
 104 }
 105
 106 if ($terse) {
 107         $emacs = 1;
 108         $quiet++;
 109 }
 110
 111 if ($tree) {
 112         if (defined $root) {
 113                 if (!top_of_kernel_tree($root)) {
 114                         die "$P: $root: --root does not point at a valid tree\n";
 115                 }
 116         } else {
 117                 if (top_of_kernel_tree('.')) {
 118                         $root = '.';
 119                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 120                                                 top_of_kernel_tree($1)) {
 121                         $root = $1;
 122                 }
 123         }
 124
 125         if (!defined $root) {
 126                 print "Must be run from the top-level dir. of a kernel tree\n";
 127                 exit(2);
 128         }
 129 }
 130
 131 my $emitted_corrupt = 0;
 132
 133 our $Ident      = qr{
 134                         [A-Za-z_][A-Za-z\d_]*
 135                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 136                 }x;
 137 our $Storage    = qr{extern|static|asmlinkage};
 138 our $Sparse     = qr{
 139                         __user|
 140                         __kernel|
 141                         __force|
 142                         __iomem|
 143                         __must_check|
 144                         __init_refok|
 145                         __kprobes|
 146                         __ref
 147                 }x;
 148
 149 # Notes to $Attribute:
 150 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 151 our $Attribute  = qr{
 152                         const|
 153                         __read_mostly|
 154                         __kprobes|
 155                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 156                         ____cacheline_aligned|
 157                         ____cacheline_aligned_in_smp|
 158                         ____cacheline_internodealigned_in_smp|
 159                         __weak
 160                   }x;
 161 our $Modifier;
 162 our $Inline     = qr{inline|__always_inline|noinline};
 163 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 164 our $Lval       = qr{$Ident(?:$Member)*};
 165
 166 our $Constant   = qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
 167 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 168 our $Compare    = qr{<=|>=|==|!=|<|>};
 169 our $Operators  = qr{
 170                         <=|>=|==|!=|
 171                         =>|->|<<|>>|<|>|!|~|
 172                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 173                   }x;
 174
 175 our $NonptrType;
 176 our $Type;
 177 our $Declare;
 178
 179 our $UTF8       = qr {
 180         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 181         | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
 182         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 183         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 184         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 185         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 186         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 187         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 188 }x;
 189
 190 our $typeTypedefs = qr{(?x:
 191         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 192         atomic_t
 193 )};
 194
 195 our $logFunctions = qr{(?x:
 196         printk|
 197         pr_(debug|dbg|vdbg|devel|info|warning|err|notice|alert|crit|emerg|cont)|
 198         (dev|netdev|netif)_(printk|dbg|vdbg|info|warn|err|notice|alert|crit|emerg|WARN)|
 199         WARN|
 200         panic
 201 )};
 202
 203 our @typeList = (
 204         qr{void},
 205         qr{(?:unsigned\s+)?char},
 206         qr{(?:unsigned\s+)?short},
 207         qr{(?:unsigned\s+)?int},
 208         qr{(?:unsigned\s+)?long},
 209         qr{(?:unsigned\s+)?long\s+int},
 210         qr{(?:unsigned\s+)?long\s+long},
 211         qr{(?:unsigned\s+)?long\s+long\s+int},
 212         qr{unsigned},
 213         qr{float},
 214         qr{double},
 215         qr{bool},
 216         qr{struct\s+$Ident},
 217         qr{union\s+$Ident},
 218         qr{enum\s+$Ident},
 219         qr{${Ident}_t},
 220         qr{${Ident}_handler},
 221         qr{${Ident}_handler_fn},
 222 );
 223 our @modifierList = (
 224         qr{fastcall},
 225 );
 226
 227 our $allowed_asm_includes = qr{(?x:
 228         irq|
 229         memory
 230 )};
 231 # memory.h: ARM has a custom one
 232
 233 sub build_types {
 234         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 235         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 236         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 237         $NonptrType     = qr{
 238                         (?:$Modifier\s+|const\s+)*
 239                         (?:
 240                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
 241                                 (?:$typeTypedefs\b)|
 242                                 (?:${all}\b)
 243                         )
 244                         (?:\s+$Modifier|\s+const)*
 245                   }x;
 246         $Type   = qr{
 247                         $NonptrType
 248                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
 249                         (?:\s+$Inline|\s+$Modifier)*
 250                   }x;
 251         $Declare        = qr{(?:$Storage\s+)?$Type};
 252 }
 253 build_types();
 254
 255 $chk_signoff = 0 if ($file);
 256
 257 my @dep_includes = ();
 258 my @dep_functions = ();
 259 my $removal = "Documentation/feature-removal-schedule.txt";
 260 if ($tree && -f "$root/$removal") {
 261         open(my $REMOVE, '<', "$root/$removal") ||
 262                                 die "$P: $removal: open failed - $!\n";
 263         while (<$REMOVE>) {
 264                 if (/^Check:\s+(.*\S)/) {
 265                         for my $entry (split(/[, ]+/, $1)) {
 266                                 if ($entry =~ m@include/(.*)@) {
 267                                         push(@dep_includes, $1);
 268
 269                                 } elsif ($entry !~ m@/@) {
 270                                         push(@dep_functions, $entry);
 271                                 }
 272                         }
 273                 }
 274         }
 275         close($REMOVE);
 276 }
 277
 278 my @rawlines = ();
 279 my @lines = ();
 280 my $vname;
 281 for my $filename (@ARGV) {
 282         my $FILE;
 283         if ($file) {
 284                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 285                         die "$P: $filename: diff failed - $!\n";
 286         } elsif ($filename eq '-') {
 287                 open($FILE, '<&STDIN');
 288         } else {
 289                 open($FILE, '<', "$filename") ||
 290                         die "$P: $filename: open failed - $!\n";
 291         }
 292         if ($filename eq '-') {
 293                 $vname = 'Your patch';
 294         } else {
 295                 $vname = $filename;
 296         }
 297         while (<$FILE>) {
 298                 chomp;
 299                 push(@rawlines, $_);
 300         }
 301         close($FILE);
 302         if (!process($filename)) {
 303                 $exit = 1;
 304         }
 305         @rawlines = ();
 306         @lines = ();
 307 }
 308
 309 exit($exit);
 310
 311 sub top_of_kernel_tree {
 312         my ($root) = @_;
 313
 314         my @tree_check = (
 315                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 316                 "README", "Documentation", "arch", "include", "drivers",
 317                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 318         );
 319
 320         foreach my $check (@tree_check) {
 321                 if (! -e $root . '/' . $check) {
 322                         return 0;
 323                 }
 324         }
 325         return 1;
 326 }
 327
 328 sub expand_tabs {
 329         my ($str) = @_;
 330
 331         my $res = '';
 332         my $n = 0;
 333         for my $c (split(//, $str)) {
 334                 if ($c eq "\t") {
 335                         $res .= ' ';
 336                         $n++;
 337                         for (; ($n % 8) != 0; $n++) {
 338                                 $res .= ' ';
 339                         }
 340                         next;
 341                 }
 342                 $res .= $c;
 343                 $n++;
 344         }
 345
 346         return $res;
 347 }
 348 sub copy_spacing {
 349         (my $res = shift) =~ tr/\t/ /c;
 350         return $res;
 351 }
 352
 353 sub line_stats {
 354         my ($line) = @_;
 355
 356         # Drop the diff line leader and expand tabs
 357         $line =~ s/^.//;
 358         $line = expand_tabs($line);
 359
 360         # Pick the indent from the front of the line.
 361         my ($white) = ($line =~ /^(\s*)/);
 362
 363         return (length($line), length($white));
 364 }
 365
 366 my $sanitise_quote = '';
 367
 368 sub sanitise_line_reset {
 369         my ($in_comment) = @_;
 370
 371         if ($in_comment) {
 372                 $sanitise_quote = '*/';
 373         } else {
 374                 $sanitise_quote = '';
 375         }
 376 }
 377 sub sanitise_line {
 378         my ($line) = @_;
 379
 380         my $res = '';
 381         my $l = '';
 382
 383         my $qlen = 0;
 384         my $off = 0;
 385         my $c;
 386
 387         # Always copy over the diff marker.
 388         $res = substr($line, 0, 1);
 389
 390         for ($off = 1; $off < length($line); $off++) {
 391                 $c = substr($line, $off, 1);
 392
 393                 # Comments we are wacking completly including the begin
 394                 # and end, all to $;.
 395                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 396                         $sanitise_quote = '*/';
 397
 398                         substr($res, $off, 2, "$;$;");
 399                         $off++;
 400                         next;
 401                 }
 402                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 403                         $sanitise_quote = '';
 404                         substr($res, $off, 2, "$;$;");
 405                         $off++;
 406                         next;
 407                 }
 408                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 409                         $sanitise_quote = '//';
 410
 411                         substr($res, $off, 2, $sanitise_quote);
 412                         $off++;
 413                         next;
 414                 }
 415
 416                 # A \ in a string means ignore the next character.
 417                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 418                     $c eq "\\") {
 419                         substr($res, $off, 2, 'XX');
 420                         $off++;
 421                         next;
 422                 }
 423                 # Regular quotes.
 424                 if ($c eq "'" || $c eq '"') {
 425                         if ($sanitise_quote eq '') {
 426                                 $sanitise_quote = $c;
 427
 428                                 substr($res, $off, 1, $c);
 429                                 next;
 430                         } elsif ($sanitise_quote eq $c) {
 431                                 $sanitise_quote = '';
 432                         }
 433                 }
 434
 435                 #print "c<$c> SQ<$sanitise_quote>\n";
 436                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 437                         substr($res, $off, 1, $;);
 438                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 439                         substr($res, $off, 1, $;);
 440                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 441                         substr($res, $off, 1, 'X');
 442                 } else {
 443                         substr($res, $off, 1, $c);
 444                 }
 445         }
 446
 447         if ($sanitise_quote eq '//') {
 448                 $sanitise_quote = '';
 449         }
 450
 451         # The pathname on a #include may be surrounded by '<' and '>'.
 452         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 453                 my $clean = 'X' x length($1);
 454                 $res =~ s@\<.*\>@<$clean>@;
 455
 456         # The whole of a #error is a string.
 457         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 458                 my $clean = 'X' x length($1);
 459                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 460         }
 461
 462         return $res;
 463 }
 464
 465 sub ctx_statement_block {
 466         my ($linenr, $remain, $off) = @_;
 467         my $line = $linenr - 1;
 468         my $blk = '';
 469         my $soff = $off;
 470         my $coff = $off - 1;
 471         my $coff_set = 0;
 472
 473         my $loff = 0;
 474
 475         my $type = '';
 476         my $level = 0;
 477         my @stack = ();
 478         my $p;
 479         my $c;
 480         my $len = 0;
 481
 482         my $remainder;
 483         while (1) {
 484                 @stack = (['', 0]) if ($#stack == -1);
 485
 486                 #warn "CSB: blk<$blk> remain<$remain>\n";
 487                 # If we are about to drop off the end, pull in more
 488                 # context.
 489                 if ($off >= $len) {
 490                         for (; $remain > 0; $line++) {
 491                                 last if (!defined $lines[$line]);
 492                                 next if ($lines[$line] =~ /^-/);
 493                                 $remain--;
 494                                 $loff = $len;
 495                                 $blk .= $lines[$line] . "\n";
 496                                 $len = length($blk);
 497                                 $line++;
 498                                 last;
 499                         }
 500                         # Bail if there is no further context.
 501                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 502                         if ($off >= $len) {
 503                                 last;
 504                         }
 505                 }
 506                 $p = $c;
 507                 $c = substr($blk, $off, 1);
 508                 $remainder = substr($blk, $off);
 509
 510                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 511
 512                 # Handle nested #if/#else.
 513                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 514                         push(@stack, [ $type, $level ]);
 515                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 516                         ($type, $level) = @{$stack[$#stack - 1]};
 517                 } elsif ($remainder =~ /^#\s*endif\b/) {
 518                         ($type, $level) = @{pop(@stack)};
 519                 }
 520
 521                 # Statement ends at the ';' or a close '}' at the
 522                 # outermost level.
 523                 if ($level == 0 && $c eq ';') {
 524                         last;
 525                 }
 526
 527                 # An else is really a conditional as long as its not else if
 528                 if ($level == 0 && $coff_set == 0 &&
 529                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 530                                 $remainder =~ /^(else)(?:\s|{)/ &&
 531                                 $remainder !~ /^else\s+if\b/) {
 532                         $coff = $off + length($1) - 1;
 533                         $coff_set = 1;
 534                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 535                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 536                 }
 537
 538                 if (($type eq '' || $type eq '(') && $c eq '(') {
 539                         $level++;
 540                         $type = '(';
 541                 }
 542                 if ($type eq '(' && $c eq ')') {
 543                         $level--;
 544                         $type = ($level != 0)? '(' : '';
 545
 546                         if ($level == 0 && $coff < $soff) {
 547                                 $coff = $off;
 548                                 $coff_set = 1;
 549                                 #warn "CSB: mark coff<$coff>\n";
 550                         }
 551                 }
 552                 if (($type eq '' || $type eq '{') && $c eq '{') {
 553                         $level++;
 554                         $type = '{';
 555                 }
 556                 if ($type eq '{' && $c eq '}') {
 557                         $level--;
 558                         $type = ($level != 0)? '{' : '';
 559
 560                         if ($level == 0) {
 561                                 last;
 562                         }
 563                 }
 564                 $off++;
 565         }
 566         # We are truly at the end, so shuffle to the next line.
 567         if ($off == $len) {
 568                 $loff = $len + 1;
 569                 $line++;
 570                 $remain--;
 571         }
 572
 573         my $statement = substr($blk, $soff, $off - $soff + 1);
 574         my $condition = substr($blk, $soff, $coff - $soff + 1);
 575
 576         #warn "STATEMENT<$statement>\n";
 577         #warn "CONDITION<$condition>\n";
 578
 579         #print "coff<$coff> soff<$off> loff<$loff>\n";
 580
 581         return ($statement, $condition,
 582                         $line, $remain + 1, $off - $loff + 1, $level);
 583 }
 584
 585 sub statement_lines {
 586         my ($stmt) = @_;
 587
 588         # Strip the diff line prefixes and rip blank lines at start and end.
 589         $stmt =~ s/(^|\n)./$1/g;
 590         $stmt =~ s/^\s*//;
 591         $stmt =~ s/\s*$//;
 592
 593         my @stmt_lines = ($stmt =~ /\n/g);
 594
 595         return $#stmt_lines + 2;
 596 }
 597
 598 sub statement_rawlines {
 599         my ($stmt) = @_;
 600
 601         my @stmt_lines = ($stmt =~ /\n/g);
 602
 603         return $#stmt_lines + 2;
 604 }
 605
 606 sub statement_block_size {
 607         my ($stmt) = @_;
 608
 609         $stmt =~ s/(^|\n)./$1/g;
 610         $stmt =~ s/^\s*{//;
 611         $stmt =~ s/}\s*$//;
 612         $stmt =~ s/^\s*//;
 613         $stmt =~ s/\s*$//;
 614
 615         my @stmt_lines = ($stmt =~ /\n/g);
 616         my @stmt_statements = ($stmt =~ /;/g);
 617
 618         my $stmt_lines = $#stmt_lines + 2;
 619         my $stmt_statements = $#stmt_statements + 1;
 620
 621         if ($stmt_lines > $stmt_statements) {
 622                 return $stmt_lines;
 623         } else {
 624                 return $stmt_statements;
 625         }
 626 }
 627
 628 sub ctx_statement_full {
 629         my ($linenr, $remain, $off) = @_;
 630         my ($statement, $condition, $level);
 631
 632         my (@chunks);
 633
 634         # Grab the first conditional/block pair.
 635         ($statement, $condition, $linenr, $remain, $off, $level) =
 636                                 ctx_statement_block($linenr, $remain, $off);
 637         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 638         push(@chunks, [ $condition, $statement ]);
 639         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 640                 return ($level, $linenr, @chunks);
 641         }
 642
 643         # Pull in the following conditional/block pairs and see if they
 644         # could continue the statement.
 645         for (;;) {
 646                 ($statement, $condition, $linenr, $remain, $off, $level) =
 647                                 ctx_statement_block($linenr, $remain, $off);
 648                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 649                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 650                 #print "C: push\n";
 651                 push(@chunks, [ $condition, $statement ]);
 652         }
 653
 654         return ($level, $linenr, @chunks);
 655 }
 656
 657 sub ctx_block_get {
 658         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 659         my $line;
 660         my $start = $linenr - 1;
 661         my $blk = '';
 662         my @o;
 663         my @c;
 664         my @res = ();
 665
 666         my $level = 0;
 667         my @stack = ($level);
 668         for ($line = $start; $remain > 0; $line++) {
 669                 next if ($rawlines[$line] =~ /^-/);
 670                 $remain--;
 671
 672                 $blk .= $rawlines[$line];
 673
 674                 # Handle nested #if/#else.
 675                 if ($rawlines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 676                         push(@stack, $level);
 677                 } elsif ($rawlines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 678                         $level = $stack[$#stack - 1];
 679                 } elsif ($rawlines[$line] =~ /^.\s*#\s*endif\b/) {
 680                         $level = pop(@stack);
 681                 }
 682
 683                 foreach my $c (split(//, $rawlines[$line])) {
 684                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 685                         if ($off > 0) {
 686                                 $off--;
 687                                 next;
 688                         }
 689
 690                         if ($c eq $close && $level > 0) {
 691                                 $level--;
 692                                 last if ($level == 0);
 693                         } elsif ($c eq $open) {
 694                                 $level++;
 695                         }
 696                 }
 697
 698                 if (!$outer || $level <= 1) {
 699                         push(@res, $rawlines[$line]);
 700                 }
 701
 702                 last if ($level == 0);
 703         }
 704
 705         return ($level, @res);
 706 }
 707 sub ctx_block_outer {
 708         my ($linenr, $remain) = @_;
 709
 710         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 711         return @r;
 712 }
 713 sub ctx_block {
 714         my ($linenr, $remain) = @_;
 715
 716         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 717         return @r;
 718 }
 719 sub ctx_statement {
 720         my ($linenr, $remain, $off) = @_;
 721
 722         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 723         return @r;
 724 }
 725 sub ctx_block_level {
 726         my ($linenr, $remain) = @_;
 727
 728         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 729 }
 730 sub ctx_statement_level {
 731         my ($linenr, $remain, $off) = @_;
 732
 733         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 734 }
 735
 736 sub ctx_locate_comment {
 737         my ($first_line, $end_line) = @_;
 738
 739         # Catch a comment on the end of the line itself.
 740         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 741         return $current_comment if (defined $current_comment);
 742
 743         # Look through the context and try and figure out if there is a
 744         # comment.
 745         my $in_comment = 0;
 746         $current_comment = '';
 747         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 748                 my $line = $rawlines[$linenr - 1];
 749                 #warn "           $line\n";
 750                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 751                         $in_comment = 1;
 752                 }
 753                 if ($line =~ m@/\*@) {
 754                         $in_comment = 1;
 755                 }
 756                 if (!$in_comment && $current_comment ne '') {
 757                         $current_comment = '';
 758                 }
 759                 $current_comment .= $line . "\n" if ($in_comment);
 760                 if ($line =~ m@\*/@) {
 761                         $in_comment = 0;
 762                 }
 763         }
 764
 765         chomp($current_comment);
 766         return($current_comment);
 767 }
 768 sub ctx_has_comment {
 769         my ($first_line, $end_line) = @_;
 770         my $cmt = ctx_locate_comment($first_line, $end_line);
 771
 772         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 773         ##print "CMMT: $cmt\n";
 774
 775         return ($cmt ne '');
 776 }
 777
 778 sub raw_line {
 779         my ($linenr, $cnt) = @_;
 780
 781         my $offset = $linenr - 1;
 782         $cnt++;
 783
 784         my $line;
 785         while ($cnt) {
 786                 $line = $rawlines[$offset++];
 787                 next if (defined($line) && $line =~ /^-/);
 788                 $cnt--;
 789         }
 790
 791         return $line;
 792 }
 793
 794 sub cat_vet {
 795         my ($vet) = @_;
 796         my ($res, $coded);
 797
 798         $res = '';
 799         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 800                 $res .= $1;
 801                 if ($2 ne '') {
 802                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 803                         $res .= $coded;
 804                 }
 805         }
 806         $res =~ s/$/\$/;
 807
 808         return $res;
 809 }
 810
 811 my $av_preprocessor = 0;
 812 my $av_pending;
 813 my @av_paren_type;
 814 my $av_pend_colon;
 815
 816 sub annotate_reset {
 817         $av_preprocessor = 0;
 818         $av_pending = '_';
 819         @av_paren_type = ('E');
 820         $av_pend_colon = 'O';
 821 }
 822
 823 sub annotate_values {
 824         my ($stream, $type) = @_;
 825
 826         my $res;
 827         my $var = '_' x length($stream);
 828         my $cur = $stream;
 829
 830         print "$stream\n" if ($dbg_values > 1);
 831
 832         while (length($cur)) {
 833                 @av_paren_type = ('E') if ($#av_paren_type < 0);
 834                 print " <" . join('', @av_paren_type) .
 835                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
 836                 if ($cur =~ /^(\s+)/o) {
 837                         print "WS($1)\n" if ($dbg_values > 1);
 838                         if ($1 =~ /\n/ && $av_preprocessor) {
 839                                 $type = pop(@av_paren_type);
 840                                 $av_preprocessor = 0;
 841                         }
 842
 843                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\()/) {
 844                         print "DECLARE($1)\n" if ($dbg_values > 1);
 845                         $type = 'T';
 846
 847                 } elsif ($cur =~ /^($Modifier)\s*/) {
 848                         print "MODIFIER($1)\n" if ($dbg_values > 1);
 849                         $type = 'T';
 850
 851                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
 852                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
 853                         $av_preprocessor = 1;
 854                         push(@av_paren_type, $type);
 855                         if ($2 ne '') {
 856                                 $av_pending = 'N';
 857                         }
 858                         $type = 'E';
 859
 860                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
 861                         print "UNDEF($1)\n" if ($dbg_values > 1);
 862                         $av_preprocessor = 1;
 863                         push(@av_paren_type, $type);
 864
 865                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
 866                         print "PRE_START($1)\n" if ($dbg_values > 1);
 867                         $av_preprocessor = 1;
 868
 869                         push(@av_paren_type, $type);
 870                         push(@av_paren_type, $type);
 871                         $type = 'E';
 872
 873                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
 874                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
 875                         $av_preprocessor = 1;
 876
 877                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
 878
 879                         $type = 'E';
 880
 881                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
 882                         print "PRE_END($1)\n" if ($dbg_values > 1);
 883
 884                         $av_preprocessor = 1;
 885
 886                         # Assume all arms of the conditional end as this
 887                         # one does, and continue as if the #endif was not here.
 888                         pop(@av_paren_type);
 889                         push(@av_paren_type, $type);
 890                         $type = 'E';
 891
 892                 } elsif ($cur =~ /^(\\\n)/o) {
 893                         print "PRECONT($1)\n" if ($dbg_values > 1);
 894
 895                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
 896                         print "ATTR($1)\n" if ($dbg_values > 1);
 897                         $av_pending = $type;
 898                         $type = 'N';
 899
 900                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
 901                         print "SIZEOF($1)\n" if ($dbg_values > 1);
 902                         if (defined $2) {
 903                                 $av_pending = 'V';
 904                         }
 905                         $type = 'N';
 906
 907                 } elsif ($cur =~ /^(if|while|for)\b/o) {
 908                         print "COND($1)\n" if ($dbg_values > 1);
 909                         $av_pending = 'E';
 910                         $type = 'N';
 911
 912                 } elsif ($cur =~/^(case)/o) {
 913                         print "CASE($1)\n" if ($dbg_values > 1);
 914                         $av_pend_colon = 'C';
 915                         $type = 'N';
 916
 917                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
 918                         print "KEYWORD($1)\n" if ($dbg_values > 1);
 919                         $type = 'N';
 920
 921                 } elsif ($cur =~ /^(\()/o) {
 922                         print "PAREN('$1')\n" if ($dbg_values > 1);
 923                         push(@av_paren_type, $av_pending);
 924                         $av_pending = '_';
 925                         $type = 'N';
 926
 927                 } elsif ($cur =~ /^(\))/o) {
 928                         my $new_type = pop(@av_paren_type);
 929                         if ($new_type ne '_') {
 930                                 $type = $new_type;
 931                                 print "PAREN('$1') -> $type\n"
 932                                                         if ($dbg_values > 1);
 933                         } else {
 934                                 print "PAREN('$1')\n" if ($dbg_values > 1);
 935                         }
 936
 937                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
 938                         print "FUNC($1)\n" if ($dbg_values > 1);
 939                         $type = 'V';
 940                         $av_pending = 'V';
 941
 942                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
 943                         if (defined $2 && $type eq 'C' || $type eq 'T') {
 944                                 $av_pend_colon = 'B';
 945                         } elsif ($type eq 'E') {
 946                                 $av_pend_colon = 'L';
 947                         }
 948                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
 949                         $type = 'V';
 950
 951                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
 952                         print "IDENT($1)\n" if ($dbg_values > 1);
 953                         $type = 'V';
 954
 955                 } elsif ($cur =~ /^($Assignment)/o) {
 956                         print "ASSIGN($1)\n" if ($dbg_values > 1);
 957                         $type = 'N';
 958
 959                 } elsif ($cur =~/^(;|{|})/) {
 960                         print "END($1)\n" if ($dbg_values > 1);
 961                         $type = 'E';
 962                         $av_pend_colon = 'O';
 963
 964                 } elsif ($cur =~/^(,)/) {
 965                         print "COMMA($1)\n" if ($dbg_values > 1);
 966                         $type = 'C';
 967
 968                 } elsif ($cur =~ /^(\?)/o) {
 969                         print "QUESTION($1)\n" if ($dbg_values > 1);
 970                         $type = 'N';
 971
 972                 } elsif ($cur =~ /^(:)/o) {
 973                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
 974
 975                         substr($var, length($res), 1, $av_pend_colon);
 976                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
 977                                 $type = 'E';
 978                         } else {
 979                                 $type = 'N';
 980                         }
 981                         $av_pend_colon = 'O';
 982
 983                 } elsif ($cur =~ /^(\[)/o) {
 984                         print "CLOSE($1)\n" if ($dbg_values > 1);
 985                         $type = 'N';
 986
 987                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
 988                         my $variant;
 989
 990                         print "OPV($1)\n" if ($dbg_values > 1);
 991                         if ($type eq 'V') {
 992                                 $variant = 'B';
 993                         } else {
 994                                 $variant = 'U';
 995                         }
 996
 997                         substr($var, length($res), 1, $variant);
 998                         $type = 'N';
 999
1000                 } elsif ($cur =~ /^($Operators)/o) {
1001                         print "OP($1)\n" if ($dbg_values > 1);
1002                         if ($1 ne '++' && $1 ne '--') {
1003                                 $type = 'N';
1004                         }
1005
1006                 } elsif ($cur =~ /(^.)/o) {
1007                         print "C($1)\n" if ($dbg_values > 1);
1008                 }
1009                 if (defined $1) {
1010                         $cur = substr($cur, length($1));
1011                         $res .= $type x length($1);
1012                 }
1013         }
1014
1015         return ($res, $var);
1016 }
1017
1018 sub possible {
1019         my ($possible, $line) = @_;
1020         my $notPermitted = qr{(?:
1021                 ^(?:
1022                         $Modifier|
1023                         $Storage|
1024                         $Type|
1025                         DEFINE_\S+
1026                 )$|
1027                 ^(?:
1028                         goto|
1029                         return|
1030                         case|
1031                         else|
1032                         asm|__asm__|
1033                         do
1034                 )(?:\s|$)|
1035                 ^(?:typedef|struct|enum)\b
1036             )}x;
1037         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1038         if ($possible !~ $notPermitted) {
1039                 # Check for modifiers.
1040                 $possible =~ s/\s*$Storage\s*//g;
1041                 $possible =~ s/\s*$Sparse\s*//g;
1042                 if ($possible =~ /^\s*$/) {
1043
1044                 } elsif ($possible =~ /\s/) {
1045                         $possible =~ s/\s*$Type\s*//g;
1046                         for my $modifier (split(' ', $possible)) {
1047                                 if ($modifier !~ $notPermitted) {
1048                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1049                                         push(@modifierList, $modifier);
1050                                 }
1051                         }
1052
1053                 } else {
1054                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1055                         push(@typeList, $possible);
1056                 }
1057                 build_types();
1058         } else {
1059                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1060         }
1061 }
1062
1063 my $prefix = '';
1064
1065 sub report {
1066         if (defined $tst_only && $_[0] !~ /\Q$tst_only\E/) {
1067                 return 0;
1068         }
1069         my $line = $prefix . $_[0];
1070
1071         $line = (split('\n', $line))[0] . "\n" if ($terse);
1072
1073         push(our @report, $line);
1074
1075         return 1;
1076 }
1077 sub report_dump {
1078         our @report;
1079 }
1080 sub ERROR {
1081         if (report("ERROR: $_[0]\n")) {
1082                 our $clean = 0;
1083                 our $cnt_error++;
1084         }
1085 }
1086 sub WARN {
1087         if (report("WARNING: $_[0]\n")) {
1088                 our $clean = 0;
1089                 our $cnt_warn++;
1090         }
1091 }
1092 sub CHK {
1093         if ($check && report("CHECK: $_[0]\n")) {
1094                 our $clean = 0;
1095                 our $cnt_chk++;
1096         }
1097 }
1098
1099 sub check_absolute_file {
1100         my ($absolute, $herecurr) = @_;
1101         my $file = $absolute;
1102
1103         ##print "absolute<$absolute>\n";
1104
1105         # See if any suffix of this path is a path within the tree.
1106         while ($file =~ s@^[^/]*/@@) {
1107                 if (-f "$root/$file") {
1108                         ##print "file<$file>\n";
1109                         last;
1110                 }
1111         }
1112         if (! -f _)  {
1113                 return 0;
1114         }
1115
1116         # It is, so see if the prefix is acceptable.
1117         my $prefix = $absolute;
1118         substr($prefix, -length($file)) = '';
1119
1120         ##print "prefix<$prefix>\n";
1121         if ($prefix ne ".../") {
1122                 WARN("use relative pathname instead of absolute in changelog text\n" . $herecurr);
1123         }
1124 }
1125
1126 sub process {
1127         my $filename = shift;
1128
1129         my $linenr=0;
1130         my $prevline="";
1131         my $prevrawline="";
1132         my $stashline="";
1133         my $stashrawline="";
1134
1135         my $length;
1136         my $indent;
1137         my $previndent=0;
1138         my $stashindent=0;
1139
1140         our $clean = 1;
1141         my $signoff = 0;
1142         my $is_patch = 0;
1143
1144         our @report = ();
1145         our $cnt_lines = 0;
1146         our $cnt_error = 0;
1147         our $cnt_warn = 0;
1148         our $cnt_chk = 0;
1149
1150         # Trace the real file/line as we go.
1151         my $realfile = '';
1152         my $realline = 0;
1153         my $realcnt = 0;
1154         my $here = '';
1155         my $in_comment = 0;
1156         my $comment_edge = 0;
1157         my $first_line = 0;
1158         my $p1_prefix = '';
1159
1160         my $prev_values = 'E';
1161
1162         # suppression flags
1163         my %suppress_ifbraces;
1164         my %suppress_whiletrailers;
1165         my %suppress_export;
1166
1167         # Pre-scan the patch sanitizing the lines.
1168         # Pre-scan the patch looking for any __setup documentation.
1169         #
1170         my @setup_docs = ();
1171         my $setup_docs = 0;
1172
1173         sanitise_line_reset();
1174         my $line;
1175         foreach my $rawline (@rawlines) {
1176                 $linenr++;
1177                 $line = $rawline;
1178
1179                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1180                         $setup_docs = 0;
1181                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1182                                 $setup_docs = 1;
1183                         }
1184                         #next;
1185                 }
1186                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1187                         $realline=$1-1;
1188                         if (defined $2) {
1189                                 $realcnt=$3+1;
1190                         } else {
1191                                 $realcnt=1+1;
1192                         }
1193                         $in_comment = 0;
1194
1195                         # Guestimate if this is a continuing comment.  Run
1196                         # the context looking for a comment "edge".  If this
1197                         # edge is a close comment then we must be in a comment
1198                         # at context start.
1199                         my $edge;
1200                         my $cnt = $realcnt;
1201                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1202                                 next if (defined $rawlines[$ln - 1] &&
1203                                          $rawlines[$ln - 1] =~ /^-/);
1204                                 $cnt--;
1205                                 #print "RAW<$rawlines[$ln - 1]>\n";
1206                                 last if (!defined $rawlines[$ln - 1]);
1207                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1208                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1209                                         ($edge) = $1;
1210                                         last;
1211                                 }
1212                         }
1213                         if (defined $edge && $edge eq '*/') {
1214                                 $in_comment = 1;
1215                         }
1216
1217                         # Guestimate if this is a continuing comment.  If this
1218                         # is the start of a diff block and this line starts
1219                         # ' *' then it is very likely a comment.
1220                         if (!defined $edge &&
1221                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1222                         {
1223                                 $in_comment = 1;
1224                         }
1225
1226                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1227                         sanitise_line_reset($in_comment);
1228
1229                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1230                         # Standardise the strings and chars within the input to
1231                         # simplify matching -- only bother with positive lines.
1232                         $line = sanitise_line($rawline);
1233                 }
1234                 push(@lines, $line);
1235
1236                 if ($realcnt > 1) {
1237                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1238                 } else {
1239                         $realcnt = 0;
1240                 }
1241
1242                 #print "==>$rawline\n";
1243                 #print "-->$line\n";
1244
1245                 if ($setup_docs && $line =~ /^\+/) {
1246                         push(@setup_docs, $line);
1247                 }
1248         }
1249
1250         $prefix = '';
1251
1252         $realcnt = 0;
1253         $linenr = 0;
1254         foreach my $line (@lines) {
1255                 $linenr++;
1256
1257                 my $rawline = $rawlines[$linenr - 1];
1258
1259 #extract the line range in the file after the patch is applied
1260                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1261                         $is_patch = 1;
1262                         $first_line = $linenr + 1;
1263                         $realline=$1-1;
1264                         if (defined $2) {
1265                                 $realcnt=$3+1;
1266                         } else {
1267                                 $realcnt=1+1;
1268                         }
1269                         annotate_reset();
1270                         $prev_values = 'E';
1271
1272                         %suppress_ifbraces = ();
1273                         %suppress_whiletrailers = ();
1274                         %suppress_export = ();
1275                         next;
1276
1277 # track the line number as we move through the hunk, note that
1278 # new versions of GNU diff omit the leading space on completely
1279 # blank context lines so we need to count that too.
1280                 } elsif ($line =~ /^( |\+|$)/) {
1281                         $realline++;
1282                         $realcnt-- if ($realcnt != 0);
1283
1284                         # Measure the line length and indent.
1285                         ($length, $indent) = line_stats($rawline);
1286
1287                         # Track the previous line.
1288                         ($prevline, $stashline) = ($stashline, $line);
1289                         ($previndent, $stashindent) = ($stashindent, $indent);
1290                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1291
1292                         #warn "line<$line>\n";
1293
1294                 } elsif ($realcnt == 1) {
1295                         $realcnt--;
1296                 }
1297
1298                 my $hunk_line = ($realcnt != 0);
1299
1300 #make up the handle for any error we report on this line
1301                 $prefix = "$filename:$realline: " if ($emacs && $file);
1302                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1303
1304                 $here = "#$linenr: " if (!$file);
1305                 $here = "#$realline: " if ($file);
1306
1307                 # extract the filename as it passes
1308                 if ($line=~/^\+\+\+\s+(\S+)/) {
1309                         $realfile = $1;
1310                         $realfile =~ s@^([^/]*)/@@;
1311
1312                         $p1_prefix = $1;
1313                         if (!$file && $tree && $p1_prefix ne '' &&
1314                             -e "$root/$p1_prefix") {
1315                                 WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1316                         }
1317
1318                         if ($realfile =~ m@^include/asm/@) {
1319                                 ERROR("do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1320                         }
1321                         next;
1322                 }
1323
1324                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1325
1326                 my $hereline = "$here\n$rawline\n";
1327                 my $herecurr = "$here\n$rawline\n";
1328                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1329
1330                 $cnt_lines++ if ($realcnt != 0);
1331
1332 #check the patch for a signoff:
1333                 if ($line =~ /^\s*signed-off-by:/i) {
1334                         # This is a signoff, if ugly, so do not double report.
1335                         $signoff++;
1336                         if (!($line =~ /^\s*Signed-off-by:/)) {
1337                                 WARN("Signed-off-by: is the preferred form\n" .
1338                                         $herecurr);
1339                         }
1340                         if ($line =~ /^\s*signed-off-by:\S/i) {
1341                                 WARN("space required after Signed-off-by:\n" .
1342                                         $herecurr);
1343                         }
1344                 }
1345
1346 # Check for wrappage within a valid hunk of the file
1347                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1348                         ERROR("patch seems to be corrupt (line wrapped?)\n" .
1349                                 $herecurr) if (!$emitted_corrupt++);
1350                 }
1351
1352 # Check for absolute kernel paths.
1353                 if ($tree) {
1354                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1355                                 my $file = $1;
1356
1357                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1358                                     check_absolute_file($1, $herecurr)) {
1359                                         #
1360                                 } else {
1361                                         check_absolute_file($file, $herecurr);
1362                                 }
1363                         }
1364                 }
1365
1366 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1367                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1368                     $rawline !~ m/^$UTF8*$/) {
1369                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1370
1371                         my $blank = copy_spacing($rawline);
1372                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1373                         my $hereptr = "$hereline$ptr\n";
1374
1375                         ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1376                 }
1377
1378 # ignore non-hunk lines and lines being removed
1379                 next if (!$hunk_line || $line =~ /^-/);
1380
1381 #trailing whitespace
1382                 if ($line =~ /^\+.*\015/) {
1383                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1384                         ERROR("DOS line endings\n" . $herevet);
1385
1386                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1387                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1388                         ERROR("trailing whitespace\n" . $herevet);
1389                 }
1390
1391 # check for Kconfig help text having a real description
1392                 if ($realfile =~ /Kconfig/ &&
1393                     $line =~ /\+?\s*(---)?help(---)?$/) {
1394                         my $length = 0;
1395                         for (my $l = $linenr; defined($lines[$l]); $l++) {
1396                                 my $f = $lines[$l];
1397                                 $f =~ s/#.*//;
1398                                 $f =~ s/^\s+//;
1399                                 next if ($f =~ /^$/);
1400                                 last if ($f =~ /^\s*config\s/);
1401                                 $length++;
1402                         }
1403                         WARN("please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($length < 4);
1404                 }
1405
1406 # check we are in a valid source file if not then ignore this hunk
1407                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1408
1409 #80 column limit
1410                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1411                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1412                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:,|\)\s*;)\s*$/ ||
1413                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1414                     $length > 80)
1415                 {
1416                         WARN("line over 80 characters\n" . $herecurr);
1417                 }
1418
1419 # check for spaces before a quoted newline
1420                 if ($rawline =~ /^.*\".*\s\\n/) {
1421                         WARN("unnecessary whitespace before a quoted newline\n" . $herecurr);
1422                 }
1423
1424 # check for adding lines without a newline.
1425                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1426                         WARN("adding a line without newline at end of file\n" . $herecurr);
1427                 }
1428
1429 # Blackfin: use hi/lo macros
1430                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1431                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1432                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1433                                 ERROR("use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1434                         }
1435                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1436                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1437                                 ERROR("use the HI() macro, not (... >> 16)\n" . $herevet);
1438                         }
1439                 }
1440
1441 # check we are in a valid source file C or perl if not then ignore this hunk
1442                 next if ($realfile !~ /\.(h|c|pl)$/);
1443
1444 # at the beginning of a line any tabs must come first and anything
1445 # more than 8 must use tabs.
1446                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
1447                     $rawline =~ /^\+\s*        \s*/) {
1448                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1449                         ERROR("code indent should use tabs where possible\n" . $herevet);
1450                 }
1451
1452 # check for space before tabs.
1453                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1454                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1455                         WARN("please, no space before tabs\n" . $herevet);
1456                 }
1457
1458 # check for spaces at the beginning of a line.
1459                 if ($rawline =~ /^\+ / && $rawline !~ /\+ +\*/)  {
1460                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1461                         WARN("please, no space for starting a line, \
1462                                 excluding comments\n" . $herevet);
1463                 }
1464
1465 # check we are in a valid C source file if not then ignore this hunk
1466                 next if ($realfile !~ /\.(h|c)$/);
1467
1468 # check for RCS/CVS revision markers
1469                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1470                         WARN("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1471                 }
1472
1473 # Blackfin: don't use __builtin_bfin_[cs]sync
1474                 if ($line =~ /__builtin_bfin_csync/) {
1475                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1476                         ERROR("use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1477                 }
1478                 if ($line =~ /__builtin_bfin_ssync/) {
1479                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1480                         ERROR("use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1481                 }
1482
1483 # Check for potential 'bare' types
1484                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1485                     $realline_next);
1486                 if ($realcnt && $line =~ /.\s*\S/) {
1487                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1488                                 ctx_statement_block($linenr, $realcnt, 0);
1489                         $stat =~ s/\n./\n /g;
1490                         $cond =~ s/\n./\n /g;
1491
1492                         # Find the real next line.
1493                         $realline_next = $line_nr_next;
1494                         if (defined $realline_next &&
1495                             (!defined $lines[$realline_next - 1] ||
1496                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1497                                 $realline_next++;
1498                         }
1499
1500                         my $s = $stat;
1501                         $s =~ s/{.*$//s;
1502
1503                         # Ignore goto labels.
1504                         if ($s =~ /$Ident:\*$/s) {
1505
1506                         # Ignore functions being called
1507                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1508
1509                         } elsif ($s =~ /^.\s*else\b/s) {
1510
1511                         # declarations always start with types
1512                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1513                                 my $type = $1;
1514                                 $type =~ s/\s+/ /g;
1515                                 possible($type, "A:" . $s);
1516
1517                         # definitions in global scope can only start with types
1518                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1519                                 possible($1, "B:" . $s);
1520                         }
1521
1522                         # any (foo ... *) is a pointer cast, and foo is a type
1523                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1524                                 possible($1, "C:" . $s);
1525                         }
1526
1527                         # Check for any sort of function declaration.
1528                         # int foo(something bar, other baz);
1529                         # void (*store_gdt)(x86_descr_ptr *);
1530                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1531                                 my ($name_len) = length($1);
1532
1533                                 my $ctx = $s;
1534                                 substr($ctx, 0, $name_len + 1, '');
1535                                 $ctx =~ s/\)[^\)]*$//;
1536
1537                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1538                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1539
1540                                                 possible($1, "D:" . $s);
1541                                         }
1542                                 }
1543                         }
1544
1545                 }
1546
1547 #
1548 # Checks which may be anchored in the context.
1549 #
1550
1551 # Check for switch () and associated case and default
1552 # statements should be at the same indent.
1553                 if ($line=~/\bswitch\s*\(.*\)/) {
1554                         my $err = '';
1555                         my $sep = '';
1556                         my @ctx = ctx_block_outer($linenr, $realcnt);
1557                         shift(@ctx);
1558                         for my $ctx (@ctx) {
1559                                 my ($clen, $cindent) = line_stats($ctx);
1560                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1561                                                         $indent != $cindent) {
1562                                         $err .= "$sep$ctx\n";
1563                                         $sep = '';
1564                                 } else {
1565                                         $sep = "[...]\n";
1566                                 }
1567                         }
1568                         if ($err ne '') {
1569                                 ERROR("switch and case should be at the same indent\n$hereline$err");
1570                         }
1571                 }
1572
1573 # if/while/etc brace do not go on next line, unless defining a do while loop,
1574 # or if that brace on the next line is for something else
1575                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1576                         my $pre_ctx = "$1$2";
1577
1578                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1579                         my $ctx_cnt = $realcnt - $#ctx - 1;
1580                         my $ctx = join("\n", @ctx);
1581
1582                         my $ctx_ln = $linenr;
1583                         my $ctx_skip = $realcnt;
1584
1585                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1586                                         defined $lines[$ctx_ln - 1] &&
1587                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1588                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1589                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1590                                 $ctx_ln++;
1591                         }
1592
1593                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1594                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1595
1596                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
1597                                 ERROR("that open brace { should be on the previous line\n" .
1598                                         "$here\n$ctx\n$lines[$ctx_ln - 1]\n");
1599                         }
1600                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1601                             $ctx =~ /\)\s*\;\s*$/ &&
1602                             defined $lines[$ctx_ln - 1])
1603                         {
1604                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1605                                 if ($nindent > $indent) {
1606                                         WARN("trailing semicolon indicates no statements, indent implies otherwise\n" .
1607                                                 "$here\n$ctx\n$lines[$ctx_ln - 1]\n");
1608                                 }
1609                         }
1610                 }
1611
1612 # Check relative indent for conditionals and blocks.
1613                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1614                         my ($s, $c) = ($stat, $cond);
1615
1616                         substr($s, 0, length($c), '');
1617
1618                         # Make sure we remove the line prefixes as we have
1619                         # none on the first line, and are going to readd them
1620                         # where necessary.
1621                         $s =~ s/\n./\n/gs;
1622
1623                         # Find out how long the conditional actually is.
1624                         my @newlines = ($c =~ /\n/gs);
1625                         my $cond_lines = 1 + $#newlines;
1626
1627                         # We want to check the first line inside the block
1628                         # starting at the end of the conditional, so remove:
1629                         #  1) any blank line termination
1630                         #  2) any opening brace { on end of the line
1631                         #  3) any do (...) {
1632                         my $continuation = 0;
1633                         my $check = 0;
1634                         $s =~ s/^.*\bdo\b//;
1635                         $s =~ s/^\s*{//;
1636                         if ($s =~ s/^\s*\\//) {
1637                                 $continuation = 1;
1638                         }
1639                         if ($s =~ s/^\s*?\n//) {
1640                                 $check = 1;
1641                                 $cond_lines++;
1642                         }
1643
1644                         # Also ignore a loop construct at the end of a
1645                         # preprocessor statement.
1646                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1647                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1648                                 $check = 0;
1649                         }
1650
1651                         my $cond_ptr = -1;
1652                         $continuation = 0;
1653                         while ($cond_ptr != $cond_lines) {
1654                                 $cond_ptr = $cond_lines;
1655
1656                                 # If we see an #else/#elif then the code
1657                                 # is not linear.
1658                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1659                                         $check = 0;
1660                                 }
1661
1662                                 # Ignore:
1663                                 #  1) blank lines, they should be at 0,
1664                                 #  2) preprocessor lines, and
1665                                 #  3) labels.
1666                                 if ($continuation ||
1667                                     $s =~ /^\s*?\n/ ||
1668                                     $s =~ /^\s*#\s*?/ ||
1669                                     $s =~ /^\s*$Ident\s*:/) {
1670                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1671                                         if ($s =~ s/^.*?\n//) {
1672                                                 $cond_lines++;
1673                                         }
1674                                 }
1675                         }
1676
1677                         my (undef, $sindent) = line_stats("+" . $s);
1678                         my $stat_real = raw_line($linenr, $cond_lines);
1679
1680                         # Check if either of these lines are modified, else
1681                         # this is not this patch's fault.
1682                         if (!defined($stat_real) ||
1683                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1684                                 $check = 0;
1685                         }
1686                         if (defined($stat_real) && $cond_lines > 1) {
1687                                 $stat_real = "[...]\n$stat_real";
1688                         }
1689
1690                         #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";
1691
1692                         if ($check && (($sindent % 8) != 0 ||
1693                             ($sindent <= $indent && $s ne ''))) {
1694                                 WARN("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1695                         }
1696                 }
1697
1698                 # Track the 'values' across context and added lines.
1699                 my $opline = $line; $opline =~ s/^./ /;
1700                 my ($curr_values, $curr_vars) =
1701                                 annotate_values($opline . "\n", $prev_values);
1702                 $curr_values = $prev_values . $curr_values;
1703                 if ($dbg_values) {
1704                         my $outline = $opline; $outline =~ s/\t/ /g;
1705                         print "$linenr > .$outline\n";
1706                         print "$linenr > $curr_values\n";
1707                         print "$linenr >  $curr_vars\n";
1708                 }
1709                 $prev_values = substr($curr_values, -1);
1710
1711 #ignore lines not being added
1712                 if ($line=~/^[^\+]/) {next;}
1713
1714 # TEST: allow direct testing of the type matcher.
1715                 if ($dbg_type) {
1716                         if ($line =~ /^.\s*$Declare\s*$/) {
1717                                 ERROR("TEST: is type\n" . $herecurr);
1718                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1719                                 ERROR("TEST: is not type ($1 is)\n". $herecurr);
1720                         }
1721                         next;
1722                 }
1723 # TEST: allow direct testing of the attribute matcher.
1724                 if ($dbg_attr) {
1725                         if ($line =~ /^.\s*$Modifier\s*$/) {
1726                                 ERROR("TEST: is attr\n" . $herecurr);
1727                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1728                                 ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1729                         }
1730                         next;
1731                 }
1732
1733 # check for initialisation to aggregates open brace on the next line
1734                 if ($line =~ /^.\s*{/ &&
1735                     $prevline =~ /(?:^|[^=])=\s*$/) {
1736                         ERROR("that open brace { should be on the previous line\n" . $hereprev);
1737                 }
1738
1739 #
1740 # Checks which are anchored on the added line.
1741 #
1742
1743 # check for malformed paths in #include statements (uses RAW line)
1744                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1745                         my $path = $1;
1746                         if ($path =~ m{//}) {
1747                                 ERROR("malformed #include filename\n" .
1748                                         $herecurr);
1749                         }
1750                 }
1751
1752 # no C99 // comments
1753                 if ($line =~ m{//}) {
1754                         ERROR("do not use C99 // comments\n" . $herecurr);
1755                 }
1756                 # Remove C99 comments.
1757                 $line =~ s@//.*@@;
1758                 $opline =~ s@//.*@@;
1759
1760 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
1761 # the whole statement.
1762 #print "APW <$lines[$realline_next - 1]>\n";
1763                 if (defined $realline_next &&
1764                     exists $lines[$realline_next - 1] &&
1765                     !defined $suppress_export{$realline_next} &&
1766                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
1767                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
1768                         my $name = $1;
1769                         if ($stat !~ /(?:
1770                                 \n.}\s*$|
1771                                 ^.DEFINE_$Ident\(\Q$name\E\)|
1772                                 ^.DECLARE_$Ident\(\Q$name\E\)|
1773                                 ^.LIST_HEAD\(\Q$name\E\)|
1774                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
1775                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
1776                             )/x) {
1777 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
1778                                 $suppress_export{$realline_next} = 2;
1779                         } else {
1780                                 $suppress_export{$realline_next} = 1;
1781                         }
1782                 }
1783                 if (!defined $suppress_export{$linenr} &&
1784                     $prevline =~ /^.\s*$/ &&
1785                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
1786                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
1787 #print "FOO B <$lines[$linenr - 1]>\n";
1788                         $suppress_export{$linenr} = 2;
1789                 }
1790                 if (defined $suppress_export{$linenr} &&
1791                     $suppress_export{$linenr} == 2) {
1792                         WARN("EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
1793                 }
1794
1795 # check for global initialisers.
1796                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
1797                         ERROR("do not initialise globals to 0 or NULL\n" .
1798                                 $herecurr);
1799                 }
1800 # check for static initialisers.
1801                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
1802                         ERROR("do not initialise statics to 0 or NULL\n" .
1803                                 $herecurr);
1804                 }
1805
1806 # check for new typedefs, only function parameters and sparse annotations
1807 # make sense.
1808                 if ($line =~ /\btypedef\s/ &&
1809                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
1810                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
1811                     $line !~ /\b$typeTypedefs\b/ &&
1812                     $line !~ /\b__bitwise(?:__|)\b/) {
1813                         WARN("do not add new typedefs\n" . $herecurr);
1814                 }
1815
1816 # * goes on variable not on type
1817                 # (char*[ const])
1818                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1819                         my ($from, $to) = ($1, $1);
1820
1821                         # Should start with a space.
1822                         $to =~ s/^(\S)/ $1/;
1823                         # Should not end with a space.
1824                         $to =~ s/\s+$//;
1825                         # '*'s should not have spaces between.
1826                         while ($to =~ s/\*\s+\*/\*\*/) {
1827                         }
1828
1829                         #print "from<$from> to<$to>\n";
1830                         if ($from ne $to) {
1831                                 ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
1832                         }
1833                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
1834                         my ($from, $to, $ident) = ($1, $1, $2);
1835
1836                         # Should start with a space.
1837                         $to =~ s/^(\S)/ $1/;
1838                         # Should not end with a space.
1839                         $to =~ s/\s+$//;
1840                         # '*'s should not have spaces between.
1841                         while ($to =~ s/\*\s+\*/\*\*/) {
1842                         }
1843                         # Modifiers should have spaces.
1844                         $to =~ s/(\b$Modifier$)/$1 /;
1845
1846                         #print "from<$from> to<$to> ident<$ident>\n";
1847                         if ($from ne $to && $ident !~ /^$Modifier$/) {
1848                                 ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
1849                         }
1850                 }
1851
1852 # # no BUG() or BUG_ON()
1853 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
1854 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
1855 #                       print "$herecurr";
1856 #                       $clean = 0;
1857 #               }
1858
1859                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
1860                         WARN("LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
1861                 }
1862
1863 # printk should use KERN_* levels.  Note that follow on printk's on the
1864 # same line do not need a level, so we use the current block context
1865 # to try and find and validate the current printk.  In summary the current
1866 # printk includes all preceeding printk's which have no newline on the end.
1867 # we assume the first bad printk is the one to report.
1868                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
1869                         my $ok = 0;
1870                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
1871                                 #print "CHECK<$lines[$ln - 1]\n";
1872                                 # we have a preceeding printk if it ends
1873                                 # with "\n" ignore it, else it is to blame
1874                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
1875                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
1876                                                 $ok = 1;
1877                                         }
1878                                         last;
1879                                 }
1880                         }
1881                         if ($ok == 0) {
1882                                 WARN("printk() should include KERN_ facility level\n" . $herecurr);
1883                         }
1884                 }
1885
1886 # function brace can't be on same line, except for #defines of do while,
1887 # or if closed on same line
1888                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
1889                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
1890                         ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
1891                 }
1892
1893 # open braces for enum, union and struct go on the same line.
1894                 if ($line =~ /^.\s*{/ &&
1895                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
1896                         ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
1897                 }
1898
1899 # check for spacing round square brackets; allowed:
1900 #  1. with a type on the left -- int [] a;
1901 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
1902 #  3. inside a curly brace -- = { [0...10] = 5 }
1903                 while ($line =~ /(.*?\s)\[/g) {
1904                         my ($where, $prefix) = ($-[1], $1);
1905                         if ($prefix !~ /$Type\s+$/ &&
1906                             ($where != 0 || $prefix !~ /^.\s+$/) &&
1907                             $prefix !~ /{\s+$/) {
1908                                 ERROR("space prohibited before open square bracket '['\n" . $herecurr);
1909                         }
1910                 }
1911
1912 # check for spaces between functions and their parentheses.
1913                 while ($line =~ /($Ident)\s+\(/g) {
1914                         my $name = $1;
1915                         my $ctx_before = substr($line, 0, $-[1]);
1916                         my $ctx = "$ctx_before$name";
1917
1918                         # Ignore those directives where spaces _are_ permitted.
1919                         if ($name =~ /^(?:
1920                                 if|for|while|switch|return|case|
1921                                 volatile|__volatile__|
1922                                 __attribute__|format|__extension__|
1923                                 asm|__asm__)$/x)
1924                         {
1925
1926                         # cpp #define statements have non-optional spaces, ie
1927                         # if there is a space between the name and the open
1928                         # parenthesis it is simply not a parameter group.
1929                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
1930
1931                         # cpp #elif statement condition may start with a (
1932                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
1933
1934                         # If this whole things ends with a type its most
1935                         # likely a typedef for a function.
1936                         } elsif ($ctx =~ /$Type$/) {
1937
1938                         } else {
1939                                 WARN("space prohibited between function name and open parenthesis '('\n" . $herecurr);
1940                         }
1941                 }
1942 # Check operator spacing.
1943                 if (!($line=~/\#\s*include/)) {
1944                         my $ops = qr{
1945                                 <<=|>>=|<=|>=|==|!=|
1946                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
1947                                 =>|->|<<|>>|<|>|=|!|~|
1948                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
1949                                 \?|:
1950                         }x;
1951                         my @elements = split(/($ops|;)/, $opline);
1952                         my $off = 0;
1953
1954                         my $blank = copy_spacing($opline);
1955
1956                         for (my $n = 0; $n < $#elements; $n += 2) {
1957                                 $off += length($elements[$n]);
1958
1959                                 # Pick up the preceeding and succeeding characters.
1960                                 my $ca = substr($opline, 0, $off);
1961                                 my $cc = '';
1962                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
1963                                         $cc = substr($opline, $off + length($elements[$n + 1]));
1964                                 }
1965                                 my $cb = "$ca$;$cc";
1966
1967                                 my $a = '';
1968                                 $a = 'V' if ($elements[$n] ne '');
1969                                 $a = 'W' if ($elements[$n] =~ /\s$/);
1970                                 $a = 'C' if ($elements[$n] =~ /$;$/);
1971                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
1972                                 $a = 'O' if ($elements[$n] eq '');
1973                                 $a = 'E' if ($ca =~ /^\s*$/);
1974
1975                                 my $op = $elements[$n + 1];
1976
1977                                 my $c = '';
1978                                 if (defined $elements[$n + 2]) {
1979                                         $c = 'V' if ($elements[$n + 2] ne '');
1980                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
1981                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
1982                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
1983                                         $c = 'O' if ($elements[$n + 2] eq '');
1984                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
1985                                 } else {
1986                                         $c = 'E';
1987                                 }
1988
1989                                 my $ctx = "${a}x${c}";
1990
1991                                 my $at = "(ctx:$ctx)";
1992
1993                                 my $ptr = substr($blank, 0, $off) . "^";
1994                                 my $hereptr = "$hereline$ptr\n";
1995
1996                                 # Pull out the value of this operator.
1997                                 my $op_type = substr($curr_values, $off + 1, 1);
1998
1999                                 # Get the full operator variant.
2000                                 my $opv = $op . substr($curr_vars, $off, 1);
2001
2002                                 # Ignore operators passed as parameters.
2003                                 if ($op_type ne 'V' &&
2004                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2005
2006 #                               # Ignore comments
2007 #                               } elsif ($op =~ /^$;+$/) {
2008
2009                                 # ; should have either the end of line or a space or \ after it
2010                                 } elsif ($op eq ';') {
2011                                         if ($ctx !~ /.x[WEBC]/ &&
2012                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2013                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2014                                         }
2015
2016                                 # // is a comment
2017                                 } elsif ($op eq '//') {
2018
2019                                 # No spaces for:
2020                                 #   ->
2021                                 #   :   when part of a bitfield
2022                                 } elsif ($op eq '->' || $opv eq ':B') {
2023                                         if ($ctx =~ /Wx.|.xW/) {
2024                                                 ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2025                                         }
2026
2027                                 # , must have a space on the right.
2028                                 } elsif ($op eq ',') {
2029                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2030                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2031                                         }
2032
2033                                 # '*' as part of a type definition -- reported already.
2034                                 } elsif ($opv eq '*_') {
2035                                         #warn "'*' is part of type\n";
2036
2037                                 # unary operators should have a space before and
2038                                 # none after.  May be left adjacent to another
2039                                 # unary operator, or a cast
2040                                 } elsif ($op eq '!' || $op eq '~' ||
2041                                          $opv eq '*U' || $opv eq '-U' ||
2042                                          $opv eq '&U' || $opv eq '&&U') {
2043                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2044                                                 ERROR("space required before that '$op' $at\n" . $hereptr);
2045                                         }
2046                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2047                                                 # A unary '*' may be const
2048
2049                                         } elsif ($ctx =~ /.xW/) {
2050                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2051                                         }
2052
2053                                 # unary ++ and unary -- are allowed no space on one side.
2054                                 } elsif ($op eq '++' or $op eq '--') {
2055                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2056                                                 ERROR("space required one side of that '$op' $at\n" . $hereptr);
2057                                         }
2058                                         if ($ctx =~ /Wx[BE]/ ||
2059                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2060                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2061                                         }
2062                                         if ($ctx =~ /ExW/) {
2063                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2064                                         }
2065
2066
2067                                 # << and >> may either have or not have spaces both sides
2068                                 } elsif ($op eq '<<' or $op eq '>>' or
2069                                          $op eq '&' or $op eq '^' or $op eq '|' or
2070                                          $op eq '+' or $op eq '-' or
2071                                          $op eq '*' or $op eq '/' or
2072                                          $op eq '%')
2073                                 {
2074                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2075                                                 ERROR("need consistent spacing around '$op' $at\n" .
2076                                                         $hereptr);
2077                                         }
2078
2079                                 # A colon needs no spaces before when it is
2080                                 # terminating a case value or a label.
2081                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2082                                         if ($ctx =~ /Wx./) {
2083                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2084                                         }
2085
2086                                 # All the others need spaces both sides.
2087                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2088                                         my $ok = 0;
2089
2090                                         # Ignore email addresses <foo@bar>
2091                                         if (($op eq '<' &&
2092                                              $cc =~ /^\S+\@\S+>/) ||
2093                                             ($op eq '>' &&
2094                                              $ca =~ /<\S+\@\S+$/))
2095                                         {
2096                                                 $ok = 1;
2097                                         }
2098
2099                                         # Ignore ?:
2100                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2101                                             ($op eq '?' && $cc =~ /^:/)) {
2102                                                 $ok = 1;
2103                                         }
2104
2105                                         if ($ok == 0) {
2106                                                 ERROR("spaces required around that '$op' $at\n" . $hereptr);
2107                                         }
2108                                 }
2109                                 $off += length($elements[$n + 1]);
2110                         }
2111                 }
2112
2113 # check for multiple assignments
2114                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2115                         CHK("multiple assignments should be avoided\n" . $herecurr);
2116                 }
2117
2118 ## # check for multiple declarations, allowing for a function declaration
2119 ## # continuation.
2120 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2121 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2122 ##
2123 ##                      # Remove any bracketed sections to ensure we do not
2124 ##                      # falsly report the parameters of functions.
2125 ##                      my $ln = $line;
2126 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2127 ##                      }
2128 ##                      if ($ln =~ /,/) {
2129 ##                              WARN("declaring multiple variables together should be avoided\n" . $herecurr);
2130 ##                      }
2131 ##              }
2132
2133 #need space before brace following if, while, etc
2134                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2135                     $line =~ /do{/) {
2136                         ERROR("space required before the open brace '{'\n" . $herecurr);
2137                 }
2138
2139 # closing brace should have a space following it when it has anything
2140 # on the line
2141                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2142                         ERROR("space required after that close brace '}'\n" . $herecurr);
2143                 }
2144
2145 # check spacing on square brackets
2146                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2147                         ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2148                 }
2149                 if ($line =~ /\s\]/) {
2150                         ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2151                 }
2152
2153 # check spacing on parentheses
2154                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2155                     $line !~ /for\s*\(\s+;/) {
2156                         ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2157                 }
2158                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2159                     $line !~ /for\s*\(.*;\s+\)/ &&
2160                     $line !~ /:\s+\)/) {
2161                         ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2162                 }
2163
2164 #goto labels aren't indented, allow a single space however
2165                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2166                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2167                         WARN("labels should not be indented\n" . $herecurr);
2168                 }
2169
2170 # Return is not a function.
2171                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2172                         my $spacing = $1;
2173                         my $value = $2;
2174
2175                         # Flatten any parentheses
2176                         $value =~ s/\)\(/\) \(/g;
2177                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2178                                $value !~ /(?:$Ident|-?$Constant)\s*
2179                                              $Compare\s*
2180                                              (?:$Ident|-?$Constant)/x &&
2181                                $value =~ s/\([^\(\)]*\)/1/) {
2182                         }
2183
2184                         if ($value =~ /^(?:$Ident|-?$Constant)$/) {
2185                                 ERROR("return is not a function, parentheses are not required\n" . $herecurr);
2186
2187                         } elsif ($spacing !~ /\s+/) {
2188                                 ERROR("space required before the open parenthesis '('\n" . $herecurr);
2189                         }
2190                 }
2191
2192 # Need a space before open parenthesis after if, while etc
2193                 if ($line=~/\b(if|while|for|switch)\(/) {
2194                         ERROR("space required before the open parenthesis '('\n" . $herecurr);
2195                 }
2196
2197 # Check for illegal assignment in if conditional -- and check for trailing
2198 # statements after the conditional.
2199                 if ($line =~ /do\s*(?!{)/) {
2200                         my ($stat_next) = ctx_statement_block($line_nr_next,
2201                                                 $remain_next, $off_next);
2202                         $stat_next =~ s/\n./\n /g;
2203                         ##print "stat<$stat> stat_next<$stat_next>\n";
2204
2205                         if ($stat_next =~ /^\s*while\b/) {
2206                                 # If the statement carries leading newlines,
2207                                 # then count those as offsets.
2208                                 my ($whitespace) =
2209                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2210                                 my $offset =
2211                                         statement_rawlines($whitespace) - 1;
2212
2213                                 $suppress_whiletrailers{$line_nr_next +
2214                                                                 $offset} = 1;
2215                         }
2216                 }
2217                 if (!defined $suppress_whiletrailers{$linenr} &&
2218                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2219                         my ($s, $c) = ($stat, $cond);
2220
2221                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2222                                 ERROR("do not use assignment in if condition\n" . $herecurr);
2223                         }
2224
2225                         # Find out what is on the end of the line after the
2226                         # conditional.
2227                         substr($s, 0, length($c), '');
2228                         $s =~ s/\n.*//g;
2229                         $s =~ s/$;//g;  # Remove any comments
2230                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2231                             $c !~ /}\s*while\s*/)
2232                         {
2233                                 # Find out how long the conditional actually is.
2234                                 my @newlines = ($c =~ /\n/gs);
2235                                 my $cond_lines = 1 + $#newlines;
2236                                 my $stat_real = '';
2237
2238                                 $stat_real = raw_line($linenr, $cond_lines)
2239                                                         . "\n" if ($cond_lines);
2240                                 if (defined($stat_real) && $cond_lines > 1) {
2241                                         $stat_real = "[...]\n$stat_real";
2242                                 }
2243
2244                                 ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2245                         }
2246                 }
2247
2248 # Check for bitwise tests written as boolean
2249                 if ($line =~ /
2250                         (?:
2251                                 (?:\[|\(|\&\&|\|\|)
2252                                 \s*0[xX][0-9]+\s*
2253                                 (?:\&\&|\|\|)
2254                         |
2255                                 (?:\&\&|\|\|)
2256                                 \s*0[xX][0-9]+\s*
2257                                 (?:\&\&|\|\||\)|\])
2258                         )/x)
2259                 {
2260                         WARN("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2261                 }
2262
2263 # if and else should not have general statements after it
2264                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2265                         my $s = $1;
2266                         $s =~ s/$;//g;  # Remove any comments
2267                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2268                                 ERROR("trailing statements should be on next line\n" . $herecurr);
2269                         }
2270                 }
2271 # if should not continue a brace
2272                 if ($line =~ /}\s*if\b/) {
2273                         ERROR("trailing statements should be on next line\n" .
2274                                 $herecurr);
2275                 }
2276 # case and default should not have general statements after them
2277                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2278                     $line !~ /\G(?:
2279                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2280                         \s*return\s+
2281                     )/xg)
2282                 {
2283                         ERROR("trailing statements should be on next line\n" . $herecurr);
2284                 }
2285
2286                 # Check for }<nl>else {, these must be at the same
2287                 # indent level to be relevant to each other.
2288                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2289                                                 $previndent == $indent) {
2290                         ERROR("else should follow close brace '}'\n" . $hereprev);
2291                 }
2292
2293                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2294                                                 $previndent == $indent) {
2295                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2296
2297                         # Find out what is on the end of the line after the
2298                         # conditional.
2299                         substr($s, 0, length($c), '');
2300                         $s =~ s/\n.*//g;
2301
2302                         if ($s =~ /^\s*;/) {
2303                                 ERROR("while should follow close brace '}'\n" . $hereprev);
2304                         }
2305                 }
2306
2307 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2308 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2309 #                   print "No studly caps, use _\n";
2310 #                   print "$herecurr";
2311 #                   $clean = 0;
2312 #               }
2313
2314 #no spaces allowed after \ in define
2315                 if ($line=~/\#\s*define.*\\\s$/) {
2316                         WARN("Whitepspace after \\ makes next lines useless\n" . $herecurr);
2317                 }
2318
2319 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2320                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2321                         my $file = "$1.h";
2322                         my $checkfile = "include/linux/$file";
2323                         if (-f "$root/$checkfile" &&
2324                             $realfile ne $checkfile &&
2325                             $1 !~ /$allowed_asm_includes/)
2326                         {
2327                                 if ($realfile =~ m{^arch/}) {
2328                                         CHK("Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2329                                 } else {
2330                                         WARN("Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2331                                 }
2332                         }
2333                 }
2334
2335 # multi-statement macros should be enclosed in a do while loop, grab the
2336 # first statement and ensure its the whole macro if its not enclosed
2337 # in a known good container
2338                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2339                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2340                         my $ln = $linenr;
2341                         my $cnt = $realcnt;
2342                         my ($off, $dstat, $dcond, $rest);
2343                         my $ctx = '';
2344
2345                         my $args = defined($1);
2346
2347                         # Find the end of the macro and limit our statement
2348                         # search to that.
2349                         while ($cnt > 0 && defined $lines[$ln - 1] &&
2350                                 $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2351                         {
2352                                 $ctx .= $rawlines[$ln - 1] . "\n";
2353                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2354                                 $ln++;
2355                         }
2356                         $ctx .= $rawlines[$ln - 1];
2357
2358                         ($dstat, $dcond, $ln, $cnt, $off) =
2359                                 ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2360                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2361                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2362
2363                         # Extract the remainder of the define (if any) and
2364                         # rip off surrounding spaces, and trailing \'s.
2365                         $rest = '';
2366                         while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2367                                 #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2368                                 if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2369                                         $rest .= substr($lines[$ln - 1], $off) . "\n";
2370                                         $cnt--;
2371                                 }
2372                                 $ln++;
2373                                 $off = 0;
2374                         }
2375                         $rest =~ s/\\\n.//g;
2376                         $rest =~ s/^\s*//s;
2377                         $rest =~ s/\s*$//s;
2378
2379                         # Clean up the original statement.
2380                         if ($args) {
2381                                 substr($dstat, 0, length($dcond), '');
2382                         } else {
2383                                 $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2384                         }
2385                         $dstat =~ s/$;//g;
2386                         $dstat =~ s/\\\n.//g;
2387                         $dstat =~ s/^\s*//s;
2388                         $dstat =~ s/\s*$//s;
2389
2390                         # Flatten any parentheses and braces
2391                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2392                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2393                                $dstat =~ s/\[[^\{\}]*\]/1/)
2394                         {
2395                         }
2396
2397                         my $exceptions = qr{
2398                                 $Declare|
2399                                 module_param_named|
2400                                 MODULE_PARAM_DESC|
2401                                 DECLARE_PER_CPU|
2402                                 DEFINE_PER_CPU|
2403                                 __typeof__\(|
2404                                 union|
2405                                 struct|
2406                                 \.$Ident\s*=\s*|
2407                                 ^\"|\"$
2408                         }x;
2409                         #print "REST<$rest> dstat<$dstat>\n";
2410                         if ($rest ne '') {
2411                                 if ($rest !~ /while\s*\(/ &&
2412                                     $dstat !~ /$exceptions/)
2413                                 {
2414                                         ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2415                                 }
2416
2417                         } elsif ($ctx !~ /;/) {
2418                                 if ($dstat ne '' &&
2419                                     $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2420                                     $dstat !~ /$exceptions/ &&
2421                                     $dstat !~ /^\.$Ident\s*=/ &&
2422                                     $dstat =~ /$Operators/)
2423                                 {
2424                                         ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2425                                 }
2426                         }
2427                 }
2428
2429 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
2430 # all assignments may have only one of the following with an assignment:
2431 #       .
2432 #       ALIGN(...)
2433 #       VMLINUX_SYMBOL(...)
2434                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
2435                         WARN("vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
2436                 }
2437
2438 # check for redundant bracing round if etc
2439                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
2440                         my ($level, $endln, @chunks) =
2441                                 ctx_statement_full($linenr, $realcnt, 1);
2442                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2443                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
2444                         if ($#chunks > 0 && $level == 0) {
2445                                 my $allowed = 0;
2446                                 my $seen = 0;
2447                                 my $herectx = $here . "\n";
2448                                 my $ln = $linenr - 1;
2449                                 for my $chunk (@chunks) {
2450                                         my ($cond, $block) = @{$chunk};
2451
2452                                         # If the condition carries leading newlines, then count those as offsets.
2453                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2454                                         my $offset = statement_rawlines($whitespace) - 1;
2455
2456                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2457
2458                                         # We have looked at and allowed this specific line.
2459                                         $suppress_ifbraces{$ln + $offset} = 1;
2460
2461                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2462                                         $ln += statement_rawlines($block) - 1;
2463
2464                                         substr($block, 0, length($cond), '');
2465
2466                                         $seen++ if ($block =~ /^\s*{/);
2467
2468                                         #print "cond<$cond> block<$block> allowed<$allowed>\n";
2469                                         if (statement_lines($cond) > 1) {
2470                                                 #print "APW: ALLOWED: cond<$cond>\n";
2471                                                 $allowed = 1;
2472                                         }
2473                                         if ($block =~/\b(?:if|for|while)\b/) {
2474                                                 #print "APW: ALLOWED: block<$block>\n";
2475                                                 $allowed = 1;
2476                                         }
2477                                         if (statement_block_size($block) > 1) {
2478                                                 #print "APW: ALLOWED: lines block<$block>\n";
2479                                                 $allowed = 1;
2480                                         }
2481                                 }
2482                                 if ($seen && !$allowed) {
2483                                         WARN("braces {} are not necessary for any arm of this statement\n" . $herectx);
2484                                 }
2485                         }
2486                 }
2487                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2488                                         $line =~ /\b(if|while|for|else)\b/) {
2489                         my $allowed = 0;
2490
2491                         # Check the pre-context.
2492                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2493                                 #print "APW: ALLOWED: pre<$1>\n";
2494                                 $allowed = 1;
2495                         }
2496
2497                         my ($level, $endln, @chunks) =
2498                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2499
2500                         # Check the condition.
2501                         my ($cond, $block) = @{$chunks[0]};
2502                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
2503                         if (defined $cond) {
2504                                 substr($block, 0, length($cond), '');
2505                         }
2506                         if (statement_lines($cond) > 1) {
2507                                 #print "APW: ALLOWED: cond<$cond>\n";
2508                                 $allowed = 1;
2509                         }
2510                         if ($block =~/\b(?:if|for|while)\b/) {
2511                                 #print "APW: ALLOWED: block<$block>\n";
2512                                 $allowed = 1;
2513                         }
2514                         if (statement_block_size($block) > 1) {
2515                                 #print "APW: ALLOWED: lines block<$block>\n";
2516                                 $allowed = 1;
2517                         }
2518                         # Check the post-context.
2519                         if (defined $chunks[1]) {
2520                                 my ($cond, $block) = @{$chunks[1]};
2521                                 if (defined $cond) {
2522                                         substr($block, 0, length($cond), '');
2523                                 }
2524                                 if ($block =~ /^\s*\{/) {
2525                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
2526                                         $allowed = 1;
2527                                 }
2528                         }
2529                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
2530                                 my $herectx = $here . "\n";;
2531                                 my $cnt = statement_rawlines($block);
2532
2533                                 for (my $n = 0; $n < $cnt; $n++) {
2534                                         $herectx .= raw_line($linenr, $n) . "\n";;
2535                                 }
2536
2537                                 WARN("braces {} are not necessary for single statement blocks\n" . $herectx);
2538                         }
2539                 }
2540
2541 # don't include deprecated include files (uses RAW line)
2542                 for my $inc (@dep_includes) {
2543                         if ($rawline =~ m@^.\s*\#\s*include\s*\<$inc>@) {
2544                                 ERROR("Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2545                         }
2546                 }
2547
2548 # don't use deprecated functions
2549                 for my $func (@dep_functions) {
2550                         if ($line =~ /\b$func\b/) {
2551                                 ERROR("Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2552                         }
2553                 }
2554
2555 # no volatiles please
2556                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2557                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2558                         WARN("Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
2559                 }
2560
2561 # SPIN_LOCK_UNLOCKED & RW_LOCK_UNLOCKED are deprecated
2562                 if ($line =~ /\b(SPIN_LOCK_UNLOCKED|RW_LOCK_UNLOCKED)/) {
2563                         ERROR("Use of $1 is deprecated: see Documentation/spinlocks.txt\n" . $herecurr);
2564                 }
2565
2566 # warn about #if 0
2567                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2568                         CHK("if this code is redundant consider removing it\n" .
2569                                 $herecurr);
2570                 }
2571
2572 # check for needless kfree() checks
2573                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2574                         my $expr = $1;
2575                         if ($line =~ /\bkfree\(\Q$expr\E\);/) {
2576                                 WARN("kfree(NULL) is safe this check is probably not required\n" . $hereprev);
2577                         }
2578                 }
2579 # check for needless usb_free_urb() checks
2580                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2581                         my $expr = $1;
2582                         if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
2583                                 WARN("usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
2584                         }
2585                 }
2586
2587 # prefer usleep_range over udelay
2588                 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
2589                         # ignore udelay's < 10, however
2590                         if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
2591                                 CHK("usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
2592                         }
2593                 }
2594
2595 # warn about #ifdefs in C files
2596 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
2597 #                       print "#ifdef in C files should be avoided\n";
2598 #                       print "$herecurr";
2599 #                       $clean = 0;
2600 #               }
2601
2602 # warn about spacing in #ifdefs
2603                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
2604                         ERROR("exactly one space required after that #$1\n" . $herecurr);
2605                 }
2606
2607 # check for spinlock_t definitions without a comment.
2608                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
2609                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
2610                         my $which = $1;
2611                         if (!ctx_has_comment($first_line, $linenr)) {
2612                                 CHK("$1 definition without comment\n" . $herecurr);
2613                         }
2614                 }
2615 # check for memory barriers without a comment.
2616                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
2617                         if (!ctx_has_comment($first_line, $linenr)) {
2618                                 CHK("memory barrier without comment\n" . $herecurr);
2619                         }
2620                 }
2621 # check of hardware specific defines
2622                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
2623                         CHK("architecture specific defines should be avoided\n" .  $herecurr);
2624                 }
2625
2626 # Check that the storage class is at the beginning of a declaration
2627                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2628                         WARN("storage class should be at the beginning of the declaration\n" . $herecurr)
2629                 }
2630
2631 # check the location of the inline attribute, that it is between
2632 # storage class and type.
2633                 if ($line =~ /\b$Type\s+$Inline\b/ ||
2634                     $line =~ /\b$Inline\s+$Storage\b/) {
2635                         ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2636                 }
2637
2638 # Check for __inline__ and __inline, prefer inline
2639                 if ($line =~ /\b(__inline__|__inline)\b/) {
2640                         WARN("plain inline is preferred over $1\n" . $herecurr);
2641                 }
2642
2643 # check for sizeof(&)
2644                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
2645                         WARN("sizeof(& should be avoided\n" . $herecurr);
2646                 }
2647
2648 # check for new externs in .c files.
2649                 if ($realfile =~ /\.c$/ && defined $stat &&
2650                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2651                 {
2652                         my $function_name = $1;
2653                         my $paren_space = $2;
2654
2655                         my $s = $stat;
2656                         if (defined $cond) {
2657                                 substr($s, 0, length($cond), '');
2658                         }
2659                         if ($s =~ /^\s*;/ &&
2660                             $function_name ne 'uninitialized_var')
2661                         {
2662                                 WARN("externs should be avoided in .c files\n" .  $herecurr);
2663                         }
2664
2665                         if ($paren_space =~ /\n/) {
2666                                 WARN("arguments for function declarations should follow identifier\n" . $herecurr);
2667                         }
2668
2669                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
2670                     $stat =~ /^.\s*extern\s+/)
2671                 {
2672                         WARN("externs should be avoided in .c files\n" .  $herecurr);
2673                 }
2674
2675 # checks for new __setup's
2676                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
2677                         my $name = $1;
2678
2679                         if (!grep(/$name/, @setup_docs)) {
2680                                 CHK("__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
2681                         }
2682                 }
2683
2684 # check for pointless casting of kmalloc return
2685                 if ($line =~ /\*\s*\)\s*k[czm]alloc\b/) {
2686                         WARN("unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
2687                 }
2688
2689 # check for gcc specific __FUNCTION__
2690                 if ($line =~ /__FUNCTION__/) {
2691                         WARN("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2692                 }
2693
2694 # check for semaphores used as mutexes
2695                 if ($line =~ /^.\s*(DECLARE_MUTEX|init_MUTEX)\s*\(/) {
2696                         WARN("mutexes are preferred for single holder semaphores\n" . $herecurr);
2697                 }
2698 # check for semaphores used as mutexes
2699                 if ($line =~ /^.\s*init_MUTEX_LOCKED\s*\(/) {
2700                         WARN("consider using a completion\n" . $herecurr);
2701
2702                 }
2703 # recommend strict_strto* over simple_strto*
2704                 if ($line =~ /\bsimple_(strto.*?)\s*\(/) {
2705                         WARN("consider using strict_$1 in preference to simple_$1\n" . $herecurr);
2706                 }
2707 # check for __initcall(), use device_initcall() explicitly please
2708                 if ($line =~ /^.\s*__initcall\s*\(/) {
2709                         WARN("please use device_initcall() instead of __initcall()\n" . $herecurr);
2710                 }
2711 # check for various ops structs, ensure they are const.
2712                 my $struct_ops = qr{acpi_dock_ops|
2713                                 address_space_operations|
2714                                 backlight_ops|
2715                                 block_device_operations|
2716                                 dentry_operations|
2717                                 dev_pm_ops|
2718                                 dma_map_ops|
2719                                 extent_io_ops|
2720                                 file_lock_operations|
2721                                 file_operations|
2722                                 hv_ops|
2723                                 ide_dma_ops|
2724                                 intel_dvo_dev_ops|
2725                                 item_operations|
2726                                 iwl_ops|
2727                                 kgdb_arch|
2728                                 kgdb_io|
2729                                 kset_uevent_ops|
2730                                 lock_manager_operations|
2731                                 microcode_ops|
2732                                 mtrr_ops|
2733                                 neigh_ops|
2734                                 nlmsvc_binding|
2735                                 pci_raw_ops|
2736                                 pipe_buf_operations|
2737                                 platform_hibernation_ops|
2738                                 platform_suspend_ops|
2739                                 proto_ops|
2740                                 rpc_pipe_ops|
2741                                 seq_operations|
2742                                 snd_ac97_build_ops|
2743                                 soc_pcmcia_socket_ops|
2744                                 stacktrace_ops|
2745                                 sysfs_ops|
2746                                 tty_operations|
2747                                 usb_mon_operations|
2748                                 wd_ops}x;
2749                 if ($line !~ /\bconst\b/ &&
2750                     $line =~ /\bstruct\s+($struct_ops)\b/) {
2751                         WARN("struct $1 should normally be const\n" .
2752                                 $herecurr);
2753                 }
2754
2755 # use of NR_CPUS is usually wrong
2756 # ignore definitions of NR_CPUS and usage to define arrays as likely right
2757                 if ($line =~ /\bNR_CPUS\b/ &&
2758                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
2759                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
2760                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
2761                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
2762                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
2763                 {
2764                         WARN("usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
2765                 }
2766
2767 # check for %L{u,d,i} in strings
2768                 my $string;
2769                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2770                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
2771                         $string =~ s/%%/__/g;
2772                         if ($string =~ /(?<!%)%L[udi]/) {
2773                                 WARN("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2774                                 last;
2775                         }
2776                 }
2777
2778 # whine mightly about in_atomic
2779                 if ($line =~ /\bin_atomic\s*\(/) {
2780                         if ($realfile =~ m@^drivers/@) {
2781                                 ERROR("do not use in_atomic in drivers\n" . $herecurr);
2782                         } elsif ($realfile !~ m@^kernel/@) {
2783                                 WARN("use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
2784                         }
2785                 }
2786
2787 # check for lockdep_set_novalidate_class
2788                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
2789                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
2790                         if ($realfile !~ m@^kernel/lockdep@ &&
2791                             $realfile !~ m@^include/linux/lockdep@ &&
2792                             $realfile !~ m@^drivers/base/core@) {
2793                                 ERROR("lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
2794                         }
2795                 }
2796         }
2797
2798         # If we have no input at all, then there is nothing to report on
2799         # so just keep quiet.
2800         if ($#rawlines == -1) {
2801                 exit(0);
2802         }
2803
2804         # In mailback mode only produce a report in the negative, for
2805         # things that appear to be patches.
2806         if ($mailback && ($clean == 1 || !$is_patch)) {
2807                 exit(0);
2808         }
2809
2810         # This is not a patch, and we are are in 'no-patch' mode so
2811         # just keep quiet.
2812         if (!$chk_patch && !$is_patch) {
2813                 exit(0);
2814         }
2815
2816         if (!$is_patch) {
2817                 ERROR("Does not appear to be a unified-diff format patch\n");
2818         }
2819         if ($is_patch && $chk_signoff && $signoff == 0) {
2820                 ERROR("Missing Signed-off-by: line(s)\n");
2821         }
2822
2823         print report_dump();
2824         if ($summary && !($clean == 1 && $quiet == 1)) {
2825                 print "$filename " if ($summary_file);
2826                 print "total: $cnt_error errors, $cnt_warn warnings, " .
2827                         (($check)? "$cnt_chk checks, " : "") .
2828                         "$cnt_lines lines checked\n";
2829                 print "\n" if ($quiet == 0);
2830         }
2831
2832         if ($clean == 1 && $quiet == 0) {
2833                 print "$vname has no obvious style problems and is ready for submission.\n"
2834         }
2835         if ($clean == 0 && $quiet == 0) {
2836                 print "$vname has style problems, please review.  If any of these errors\n";
2837                 print "are false positives report them to the maintainer, see\n";
2838                 print "CHECKPATCH in MAINTAINERS.\n";
2839         }
2840
2841         return $clean;
2842 }