scripts/checkpatch.pl

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