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Remove dead check from configure.ac
[deliverable/lttng-tools.git] / extras / checkpatch.pl
CommitLineData
41ab1dbe
CB		 1#!/usr/bin/perl -w
2# (c) 2001, Dave Jones. (the file handling bit)
3# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
4# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
5# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
6# Licensed under the terms of the GNU GPL License version 2
7
8use strict;
9
10my $P = $0;
11$P =~ s@.*/@@g;
12
13my $V = '0.32';
14
15use Getopt::Long qw(:config no_auto_abbrev);
16
17my $quiet = 0;
18my $tree = 1;
19my $chk_signoff = 1;
20my $chk_patch = 1;
21my $tst_only;
22my $emacs = 0;
23my $terse = 0;
24my $file = 0;
25my $check = 0;
26my $summary = 1;
27my $mailback = 0;
28my $summary_file = 0;
29my $show_types = 0;
30my $root;
31my %debug;
32my %ignore_type = ();
33my @ignore = ();
34my $help = 0;
35my $configuration_file = ".checkpatch.conf";
36my $max_line_length = 80;
37
38sub help {
39 my ($exitcode) = @_;
40
41 print << "EOM";
42Usage: $P [OPTION]... [FILE]...
43Version: $V
44
45Options:
46 -q, --quiet quiet
47 --no-tree run without a kernel tree
48 --no-signoff do not check for 'Signed-off-by' line
49 --patch treat FILE as patchfile (default)
50 --emacs emacs compile window format
51 --terse one line per report
52 -f, --file treat FILE as regular source file
53 --subjective, --strict enable more subjective tests
54 --ignore TYPE(,TYPE2...) ignore various comma separated message types
55 --max-line-length=n set the maximum line length, if exceeded, warn
56 --show-types show the message "types" in the output
57 --root=PATH PATH to the kernel tree root
58 --no-summary suppress the per-file summary
59 --mailback only produce a report in case of warnings/errors
60 --summary-file include the filename in summary
61 --debug KEY=[0|1] turn on/off debugging of KEY, where KEY is one of
62 'values', 'possible', 'type', and 'attr' (default
63 is all off)
64 --test-only=WORD report only warnings/errors containing WORD
65 literally
66 -h, --help, --version display this help and exit
67
68When FILE is - read standard input.
69EOM
70
71 exit($exitcode);
72}
73
74my $conf = which_conf($configuration_file);
75if (-f $conf) {
76 my @conf_args;
77 open(my $conffile, '<', "$conf")
78 or warn "$P: Can't find a readable $configuration_file file $!\n";
79
80 while (<$conffile>) {
81 my $line = $_;
82
83 $line =~ s/\s*\n?$//g;
84 $line =~ s/^\s*//g;
85 $line =~ s/\s+/ /g;
86
87 next if ($line =~ m/^\s*#/);
88 next if ($line =~ m/^\s*$/);
89
90 my @words = split(" ", $line);
91 foreach my $word (@words) {
92 last if ($word =~ m/^#/);
93 push (@conf_args, $word);
94 }
95 }
96 close($conffile);
97 unshift(@ARGV, @conf_args) if @conf_args;
98}
99
100GetOptions(
101 'q|quiet+' => \$quiet,
102 'tree!' => \$tree,
103 'signoff!' => \$chk_signoff,
104 'patch!' => \$chk_patch,
105 'emacs!' => \$emacs,
106 'terse!' => \$terse,
107 'f|file!' => \$file,
108 'subjective!' => \$check,
109 'strict!' => \$check,
110 'ignore=s' => \@ignore,
111 'show-types!' => \$show_types,
112 'max-line-length=i' => \$max_line_length,
113 'root=s' => \$root,
114 'summary!' => \$summary,
115 'mailback!' => \$mailback,
116 'summary-file!' => \$summary_file,
117
118 'debug=s' => \%debug,
119 'test-only=s' => \$tst_only,
120 'h|help' => \$help,
121 'version' => \$help
122) or help(1);
123
124help(0) if ($help);
125
126my $exit = 0;
127
128if ($#ARGV < 0) {
129 print "$P: no input files\n";
130 exit(1);
131}
132
133@ignore = split(/,/, join(',',@ignore));
134foreach my $word (@ignore) {
135 $word =~ s/\s*\n?$//g;
136 $word =~ s/^\s*//g;
137 $word =~ s/\s+/ /g;
138 $word =~ tr/[a-z]/[A-Z]/;
139
140 next if ($word =~ m/^\s*#/);
141 next if ($word =~ m/^\s*$/);
142
143 $ignore_type{$word}++;
144}
145
146my $dbg_values = 0;
147my $dbg_possible = 0;
148my $dbg_type = 0;
149my $dbg_attr = 0;
150for my $key (keys %debug) {
151 ## no critic
152 eval "\${dbg_$key} = '$debug{$key}';";
153 die "$@" if ($@);
154}
155
156my $rpt_cleaners = 0;
157
158if ($terse) {
159 $emacs = 1;
160 $quiet++;
161}
162
163if ($tree) {
164 if (defined $root) {
165 if (!top_of_kernel_tree($root)) {
166 die "$P: $root: --root does not point at a valid tree\n";
167 }
168 } else {
169 if (top_of_kernel_tree('.')) {
170 $root = '.';
171 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
172 top_of_kernel_tree($1)) {
173 $root = $1;
174 }
175 }
176
177 if (!defined $root) {
178 print "Must be run from the top-level dir. of a kernel tree\n";
179 exit(2);
180 }
181}
182
183my $emitted_corrupt = 0;
184
185our $Ident = qr{
186 [A-Za-z_][A-Za-z\d_]*
187 (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
188 }x;
189our $Storage = qr{extern|static|asmlinkage};
190our $Sparse = qr{
191 __user|
192 __kernel|
193 __force|
194 __iomem|
195 __must_check|
196 __init_refok|
197 __kprobes|
198 __ref|
199 __rcu
200 }x;
201
202# Notes to $Attribute:
203# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
204our $Attribute = qr{
205 const|
206 __percpu|
207 __nocast|
208 __safe|
209 __bitwise__|
210 __packed__|
211 __packed2__|
212 __naked|
213 __maybe_unused|
214 __always_unused|
215 __noreturn|
216 __used|
217 __cold|
218 __noclone|
219 __deprecated|
220 __read_mostly|
221 __kprobes|
222 __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
223 ____cacheline_aligned|
224 ____cacheline_aligned_in_smp|
225 ____cacheline_internodealigned_in_smp|
226 __weak
227 }x;
228our $Modifier;
229our $Inline = qr{inline|__always_inline|noinline};
230our $Member = qr{->$Ident|\.$Ident|\[[^]]*\]};
231our $Lval = qr{$Ident(?:$Member)*};
232
233our $Float_hex = qr{(?i:0x[0-9a-f]+p-?[0-9]+[fl]?)};
234our $Float_dec = qr{(?i:((?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?))};
235our $Float_int = qr{(?i:[0-9]+e-?[0-9]+[fl]?)};
236our $Float = qr{$Float_hex|$Float_dec|$Float_int};
237our $Constant = qr{(?:$Float|(?i:(?:0x[0-9a-f]+|[0-9]+)[ul]*))};
238our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
239our $Compare = qr{<=|>=|==|!=|<|>};
240our $Operators = qr{
241 <=|>=|==|!=|
242 =>|->|<<|>>|<|>|!|~|
243 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
244 }x;
245
246our $NonptrType;
247our $Type;
248our $Declare;
249
250our $NON_ASCII_UTF8 = qr{
251 [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
252 | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
253 | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
254 | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
255 | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
256 | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
257 | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
258}x;
259
260our $UTF8 = qr{
261 [\x09\x0A\x0D\x20-\x7E] # ASCII
262 | $NON_ASCII_UTF8
263}x;
264
265our $typeTypedefs = qr{(?x:
266 (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
267 atomic_t
268)};
269
270our $logFunctions = qr{(?x:
271 printk(?:_ratelimited|_once|)|
272 [a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
273 WARN(?:_RATELIMIT|_ONCE|)|
274 panic|
275 MODULE_[A-Z_]+
276)};
277
278our $signature_tags = qr{(?xi:
279 Signed-off-by:|
280 Acked-by:|
281 Tested-by:|
282 Reviewed-by:|
283 Reported-by:|
284 To:|
285 Cc:
286)};
287
288our @typeList = (
289 qr{void},
290 qr{(?:unsigned\s+)?char},
291 qr{(?:unsigned\s+)?short},
292 qr{(?:unsigned\s+)?int},
293 qr{(?:unsigned\s+)?long},
294 qr{(?:unsigned\s+)?long\s+int},
295 qr{(?:unsigned\s+)?long\s+long},
296 qr{(?:unsigned\s+)?long\s+long\s+int},
297 qr{unsigned},
298 qr{float},
299 qr{double},
300 qr{bool},
301 qr{struct\s+$Ident},
302 qr{union\s+$Ident},
303 qr{enum\s+$Ident},
304 qr{${Ident}_t},
305 qr{${Ident}_handler},
306 qr{${Ident}_handler_fn},
307);
308our @modifierList = (
309 qr{fastcall},
310);
311
312our $allowed_asm_includes = qr{(?x:
313 irq|
314 memory
315)};
316# memory.h: ARM has a custom one
317
318sub build_types {
319 my $mods = "(?x: \n" . join("|\n ", @modifierList) . "\n)";
320 my $all = "(?x: \n" . join("|\n ", @typeList) . "\n)";
321 $Modifier = qr{(?:$Attribute|$Sparse|$mods)};
322 $NonptrType = qr{
323 (?:$Modifier\s+|const\s+)*
324 (?:
325 (?:typeof|__typeof__)\s*\([^\)]*\)|
326 (?:$typeTypedefs\b)|
327 (?:${all}\b)
328 )
329 (?:\s+$Modifier|\s+const)*
330 }x;
331 $Type = qr{
332 $NonptrType
333 (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*|\[\])+|(?:\s*\[\s*\])+)?
334 (?:\s+$Inline|\s+$Modifier)*
335 }x;
336 $Declare = qr{(?:$Storage\s+)?$Type};
337}
338build_types();
339
340
341our $Typecast = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
342
343# Using $balanced_parens, $LvalOrFunc, or $FuncArg
344# requires at least perl version v5.10.0
345# Any use must be runtime checked with $^V
346
347our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
348our $LvalOrFunc = qr{($Lval)\s*($balanced_parens{0,1})\s*};
349our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
350
351sub deparenthesize {
352 my ($string) = @_;
353 return "" if (!defined($string));
354 $string =~ s@^\s*\(\s*@@g;
355 $string =~ s@\s*\)\s*$@@g;
356 $string =~ s@\s+@ @g;
357 return $string;
358}
359
360$chk_signoff = 0 if ($file);
361
362my @rawlines = ();
363my @lines = ();
364my $vname;
365for my $filename (@ARGV) {
366 my $FILE;
367 if ($file) {
368 open($FILE, '-|', "diff -u /dev/null $filename") ||
369 die "$P: $filename: diff failed - $!\n";
370 } elsif ($filename eq '-') {
371 open($FILE, '<&STDIN');
372 } else {
373 open($FILE, '<', "$filename") ||
374 die "$P: $filename: open failed - $!\n";
375 }
376 if ($filename eq '-') {
377 $vname = 'Your patch';
378 } else {
379 $vname = $filename;
380 }
381 while (<$FILE>) {
382 chomp;
383 push(@rawlines, $_);
384 }
385 close($FILE);
386 if (!process($filename)) {
387 $exit = 1;
388 }
389 @rawlines = ();
390 @lines = ();
391}
392
393exit($exit);
394
395sub top_of_kernel_tree {
396 my ($root) = @_;
397
398 my @tree_check = (
399 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
400 "README", "Documentation", "arch", "include", "drivers",
401 "fs", "init", "ipc", "kernel", "lib", "scripts",
402 );
403
404 foreach my $check (@tree_check) {
405 if (! -e $root . '/' . $check) {
406 return 0;
407 }
408 }
409 return 1;
410}
411
412sub parse_email {
413 my ($formatted_email) = @_;
414
415 my $name = "";
416 my $address = "";
417 my $comment = "";
418
419 if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
420 $name = $1;
421 $address = $2;
422 $comment = $3 if defined $3;
423 } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
424 $address = $1;
425 $comment = $2 if defined $2;
426 } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
427 $address = $1;
428 $comment = $2 if defined $2;
429 $formatted_email =~ s/$address.*$//;
430 $name = $formatted_email;
431 $name =~ s/^\s+|\s+$//g;
432 $name =~ s/^\"|\"$//g;
433 # If there's a name left after stripping spaces and
434 # leading quotes, and the address doesn't have both
435 # leading and trailing angle brackets, the address
436 # is invalid. ie:
437 # "joe smith joe@smith.com" bad
438 # "joe smith <joe@smith.com" bad
439 if ($name ne "" && $address !~ /^<[^>]+>$/) {
440 $name = "";
441 $address = "";
442 $comment = "";
443 }
444 }
445
446 $name =~ s/^\s+|\s+$//g;
447 $name =~ s/^\"|\"$//g;
448 $address =~ s/^\s+|\s+$//g;
449 $address =~ s/^\<|\>$//g;
450
451 if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
452 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
453 $name = "\"$name\"";
454 }
455
456 return ($name, $address, $comment);
457}
458
459sub format_email {
460 my ($name, $address) = @_;
461
462 my $formatted_email;
463
464 $name =~ s/^\s+|\s+$//g;
465 $name =~ s/^\"|\"$//g;
466 $address =~ s/^\s+|\s+$//g;
467
468 if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
469 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
470 $name = "\"$name\"";
471 }
472
473 if ("$name" eq "") {
474 $formatted_email = "$address";
475 } else {
476 $formatted_email = "$name <$address>";
477 }
478
479 return $formatted_email;
480}
481
482sub which_conf {
483 my ($conf) = @_;
484
485 foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
486 if (-e "$path/$conf") {
487 return "$path/$conf";
488 }
489 }
490
491 return "";
492}
493
494sub expand_tabs {
495 my ($str) = @_;
496
497 my $res = '';
498 my $n = 0;
499 for my $c (split(//, $str)) {
500 if ($c eq "\t") {
501 $res .= ' ';
502 $n++;
36f001b3 503 for (; ($n % 4) != 0; $n++) {
41ab1dbe
CB		 504 $res .= ' ';
505 }
506 next;
507 }
508 $res .= $c;
509 $n++;
510 }
511
512 return $res;
513}
514sub copy_spacing {
515 (my $res = shift) =~ tr/\t/ /c;
516 return $res;
517}
518
519sub line_stats {
520 my ($line) = @_;
521
522 # Drop the diff line leader and expand tabs
523 $line =~ s/^.//;
524 $line = expand_tabs($line);
525
526 # Pick the indent from the front of the line.
527 my ($white) = ($line =~ /^(\s*)/);
528
529 return (length($line), length($white));
530}
531
532my $sanitise_quote = '';
533
534sub sanitise_line_reset {
535 my ($in_comment) = @_;
536
537 if ($in_comment) {
538 $sanitise_quote = '*/';
539 } else {
540 $sanitise_quote = '';
541 }
542}
543sub sanitise_line {
544 my ($line) = @_;
545
546 my $res = '';
547 my $l = '';
548
549 my $qlen = 0;
550 my $off = 0;
551 my $c;
552
553 # Always copy over the diff marker.
554 $res = substr($line, 0, 1);
555
556 for ($off = 1; $off < length($line); $off++) {
557 $c = substr($line, $off, 1);
558
559 # Comments we are wacking completly including the begin
560 # and end, all to $;.
561 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
562 $sanitise_quote = '*/';
563
564 substr($res, $off, 2, "$;$;");
565 $off++;
566 next;
567 }
568 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
569 $sanitise_quote = '';
570 substr($res, $off, 2, "$;$;");
571 $off++;
572 next;
573 }
574 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
575 $sanitise_quote = '//';
576
577 substr($res, $off, 2, $sanitise_quote);
578 $off++;
579 next;
580 }
581
582 # A \ in a string means ignore the next character.
583 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
584 $c eq "\\") {
585 substr($res, $off, 2, 'XX');
586 $off++;
587 next;
588 }
589 # Regular quotes.
590 if ($c eq "'" || $c eq '"') {
591 if ($sanitise_quote eq '') {
592 $sanitise_quote = $c;
593
594 substr($res, $off, 1, $c);
595 next;
596 } elsif ($sanitise_quote eq $c) {
597 $sanitise_quote = '';
598 }
599 }
600
601 #print "c<$c> SQ<$sanitise_quote>\n";
602 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
603 substr($res, $off, 1, $;);
604 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
605 substr($res, $off, 1, $;);
606 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
607 substr($res, $off, 1, 'X');
608 } else {
609 substr($res, $off, 1, $c);
610 }
611 }
612
613 if ($sanitise_quote eq '//') {
614 $sanitise_quote = '';
615 }
616
617 # The pathname on a #include may be surrounded by '<' and '>'.
618 if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
619 my $clean = 'X' x length($1);
620 $res =~ s@\<.*\>@<$clean>@;
621
622 # The whole of a #error is a string.
623 } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
624 my $clean = 'X' x length($1);
625 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
626 }
627
628 return $res;
629}
630
631sub ctx_statement_block {
632 my ($linenr, $remain, $off) = @_;
633 my $line = $linenr - 1;
634 my $blk = '';
635 my $soff = $off;
636 my $coff = $off - 1;
637 my $coff_set = 0;
638
639 my $loff = 0;
640
641 my $type = '';
642 my $level = 0;
643 my @stack = ();
644 my $p;
645 my $c;
646 my $len = 0;
647
648 my $remainder;
649 while (1) {
650 @stack = (['', 0]) if ($#stack == -1);
651
652 #warn "CSB: blk<$blk> remain<$remain>\n";
653 # If we are about to drop off the end, pull in more
654 # context.
655 if ($off >= $len) {
656 for (; $remain > 0; $line++) {
657 last if (!defined $lines[$line]);
658 next if ($lines[$line] =~ /^-/);
659 $remain--;
660 $loff = $len;
661 $blk .= $lines[$line] . "\n";
662 $len = length($blk);
663 $line++;
664 last;
665 }
666 # Bail if there is no further context.
667 #warn "CSB: blk<$blk> off<$off> len<$len>\n";
668 if ($off >= $len) {
669 last;
670 }
671 if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
672 $level++;
673 $type = '#';
674 }
675 }
676 $p = $c;
677 $c = substr($blk, $off, 1);
678 $remainder = substr($blk, $off);
679
680 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
681
682 # Handle nested #if/#else.
683 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
684 push(@stack, [ $type, $level ]);
685 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
686 ($type, $level) = @{$stack[$#stack - 1]};
687 } elsif ($remainder =~ /^#\s*endif\b/) {
688 ($type, $level) = @{pop(@stack)};
689 }
690
691 # Statement ends at the ';' or a close '}' at the
692 # outermost level.
693 if ($level == 0 && $c eq ';') {
694 last;
695 }
696
697 # An else is really a conditional as long as its not else if
698 if ($level == 0 && $coff_set == 0 &&
699 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
700 $remainder =~ /^(else)(?:\s|{)/ &&
701 $remainder !~ /^else\s+if\b/) {
702 $coff = $off + length($1) - 1;
703 $coff_set = 1;
704 #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
705 #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
706 }
707
708 if (($type eq '' || $type eq '(') && $c eq '(') {
709 $level++;
710 $type = '(';
711 }
712 if ($type eq '(' && $c eq ')') {
713 $level--;
714 $type = ($level != 0)? '(' : '';
715
716 if ($level == 0 && $coff < $soff) {
717 $coff = $off;
718 $coff_set = 1;
719 #warn "CSB: mark coff<$coff>\n";
720 }
721 }
722 if (($type eq '' || $type eq '{') && $c eq '{') {
723 $level++;
724 $type = '{';
725 }
726 if ($type eq '{' && $c eq '}') {
727 $level--;
728 $type = ($level != 0)? '{' : '';
729
730 if ($level == 0) {
731 if (substr($blk, $off + 1, 1) eq ';') {
732 $off++;
733 }
734 last;
735 }
736 }
737 # Preprocessor commands end at the newline unless escaped.
738 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
739 $level--;
740 $type = '';
741 $off++;
742 last;
743 }
744 $off++;
745 }
746 # We are truly at the end, so shuffle to the next line.
747 if ($off == $len) {
748 $loff = $len + 1;
749 $line++;
750 $remain--;
751 }
752
753 my $statement = substr($blk, $soff, $off - $soff + 1);
754 my $condition = substr($blk, $soff, $coff - $soff + 1);
755
756 #warn "STATEMENT<$statement>\n";
757 #warn "CONDITION<$condition>\n";
758
759 #print "coff<$coff> soff<$off> loff<$loff>\n";
760
761 return ($statement, $condition,
762 $line, $remain + 1, $off - $loff + 1, $level);
763}
764
765sub statement_lines {
766 my ($stmt) = @_;
767
768 # Strip the diff line prefixes and rip blank lines at start and end.
769 $stmt =~ s/(^|\n)./$1/g;
770 $stmt =~ s/^\s*//;
771 $stmt =~ s/\s*$//;
772
773 my @stmt_lines = ($stmt =~ /\n/g);
774
775 return $#stmt_lines + 2;
776}
777
778sub statement_rawlines {
779 my ($stmt) = @_;
780
781 my @stmt_lines = ($stmt =~ /\n/g);
782
783 return $#stmt_lines + 2;
784}
785
786sub statement_block_size {
787 my ($stmt) = @_;
788
789 $stmt =~ s/(^|\n)./$1/g;
790 $stmt =~ s/^\s*{//;
791 $stmt =~ s/}\s*$//;
792 $stmt =~ s/^\s*//;
793 $stmt =~ s/\s*$//;
794
795 my @stmt_lines = ($stmt =~ /\n/g);
796 my @stmt_statements = ($stmt =~ /;/g);
797
798 my $stmt_lines = $#stmt_lines + 2;
799 my $stmt_statements = $#stmt_statements + 1;
800
801 if ($stmt_lines > $stmt_statements) {
802 return $stmt_lines;
803 } else {
804 return $stmt_statements;
805 }
806}
807
808sub ctx_statement_full {
809 my ($linenr, $remain, $off) = @_;
810 my ($statement, $condition, $level);
811
812 my (@chunks);
813
814 # Grab the first conditional/block pair.
815 ($statement, $condition, $linenr, $remain, $off, $level) =
816 ctx_statement_block($linenr, $remain, $off);
817 #print "F: c<$condition> s<$statement> remain<$remain>\n";
818 push(@chunks, [ $condition, $statement ]);
819 if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
820 return ($level, $linenr, @chunks);
821 }
822
823 # Pull in the following conditional/block pairs and see if they
824 # could continue the statement.
825 for (;;) {
826 ($statement, $condition, $linenr, $remain, $off, $level) =
827 ctx_statement_block($linenr, $remain, $off);
828 #print "C: c<$condition> s<$statement> remain<$remain>\n";
829 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
830 #print "C: push\n";
831 push(@chunks, [ $condition, $statement ]);
832 }
833
834 return ($level, $linenr, @chunks);
835}
836
837sub ctx_block_get {
838 my ($linenr, $remain, $outer, $open, $close, $off) = @_;
839 my $line;
840 my $start = $linenr - 1;
841 my $blk = '';
842 my @o;
843 my @c;
844 my @res = ();
845
846 my $level = 0;
847 my @stack = ($level);
848 for ($line = $start; $remain > 0; $line++) {
849 next if ($rawlines[$line] =~ /^-/);
850 $remain--;
851
852 $blk .= $rawlines[$line];
853
854 # Handle nested #if/#else.
855 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
856 push(@stack, $level);
857 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
858 $level = $stack[$#stack - 1];
859 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
860 $level = pop(@stack);
861 }
862
863 foreach my $c (split(//, $lines[$line])) {
864 ##print "C<$c>L<$level><$open$close>O<$off>\n";
865 if ($off > 0) {
866 $off--;
867 next;
868 }
869
870 if ($c eq $close && $level > 0) {
871 $level--;
872 last if ($level == 0);
873 } elsif ($c eq $open) {
874 $level++;
875 }
876 }
877
878 if (!$outer || $level <= 1) {
879 push(@res, $rawlines[$line]);
880 }
881
882 last if ($level == 0);
883 }
884
885 return ($level, @res);
886}
887sub ctx_block_outer {
888 my ($linenr, $remain) = @_;
889
890 my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
891 return @r;
892}
893sub ctx_block {
894 my ($linenr, $remain) = @_;
895
896 my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
897 return @r;
898}
899sub ctx_statement {
900 my ($linenr, $remain, $off) = @_;
901
902 my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
903 return @r;
904}
905sub ctx_block_level {
906 my ($linenr, $remain) = @_;
907
908 return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
909}
910sub ctx_statement_level {
911 my ($linenr, $remain, $off) = @_;
912
913 return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
914}
915
916sub ctx_locate_comment {
917 my ($first_line, $end_line) = @_;
918
919 # Catch a comment on the end of the line itself.
920 my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
921 return $current_comment if (defined $current_comment);
922
923 # Look through the context and try and figure out if there is a
924 # comment.
925 my $in_comment = 0;
926 $current_comment = '';
927 for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
928 my $line = $rawlines[$linenr - 1];
929 #warn " $line\n";
930 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
931 $in_comment = 1;
932 }
933 if ($line =~ m@/\*@) {
934 $in_comment = 1;
935 }
936 if (!$in_comment && $current_comment ne '') {
937 $current_comment = '';
938 }
939 $current_comment .= $line . "\n" if ($in_comment);
940 if ($line =~ m@\*/@) {
941 $in_comment = 0;
942 }
943 }
944
945 chomp($current_comment);
946 return($current_comment);
947}
948sub ctx_has_comment {
949 my ($first_line, $end_line) = @_;
950 my $cmt = ctx_locate_comment($first_line, $end_line);
951
952 ##print "LINE: $rawlines[$end_line - 1 ]\n";
953 ##print "CMMT: $cmt\n";
954
955 return ($cmt ne '');
956}
957
958sub raw_line {
959 my ($linenr, $cnt) = @_;
960
961 my $offset = $linenr - 1;
962 $cnt++;
963
964 my $line;
965 while ($cnt) {
966 $line = $rawlines[$offset++];
967 next if (defined($line) && $line =~ /^-/);
968 $cnt--;
969 }
970
971 return $line;
972}
973
974sub cat_vet {
975 my ($vet) = @_;
976 my ($res, $coded);
977
978 $res = '';
979 while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
980 $res .= $1;
981 if ($2 ne '') {
982 $coded = sprintf("^%c", unpack('C', $2) + 64);
983 $res .= $coded;
984 }
985 }
986 $res =~ s/$/\$/;
987
988 return $res;
989}
990
991my $av_preprocessor = 0;
992my $av_pending;
993my @av_paren_type;
994my $av_pend_colon;
995
996sub annotate_reset {
997 $av_preprocessor = 0;
998 $av_pending = '_';
999 @av_paren_type = ('E');
1000 $av_pend_colon = 'O';
1001}
1002
1003sub annotate_values {
1004 my ($stream, $type) = @_;
1005
1006 my $res;
1007 my $var = '_' x length($stream);
1008 my $cur = $stream;
1009
1010 print "$stream\n" if ($dbg_values > 1);
1011
1012 while (length($cur)) {
1013 @av_paren_type = ('E') if ($#av_paren_type < 0);
1014 print " <" . join('', @av_paren_type) .
1015 "> <$type> <$av_pending>" if ($dbg_values > 1);
1016 if ($cur =~ /^(\s+)/o) {
1017 print "WS($1)\n" if ($dbg_values > 1);
1018 if ($1 =~ /\n/ && $av_preprocessor) {
1019 $type = pop(@av_paren_type);
1020 $av_preprocessor = 0;
1021 }
1022
1023 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1024 print "CAST($1)\n" if ($dbg_values > 1);
1025 push(@av_paren_type, $type);
1026 $type = 'c';
1027
1028 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1029 print "DECLARE($1)\n" if ($dbg_values > 1);
1030 $type = 'T';
1031
1032 } elsif ($cur =~ /^($Modifier)\s*/) {
1033 print "MODIFIER($1)\n" if ($dbg_values > 1);
1034 $type = 'T';
1035
1036 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1037 print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1038 $av_preprocessor = 1;
1039 push(@av_paren_type, $type);
1040 if ($2 ne '') {
1041 $av_pending = 'N';
1042 }
1043 $type = 'E';
1044
1045 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1046 print "UNDEF($1)\n" if ($dbg_values > 1);
1047 $av_preprocessor = 1;
1048 push(@av_paren_type, $type);
1049
1050 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1051 print "PRE_START($1)\n" if ($dbg_values > 1);
1052 $av_preprocessor = 1;
1053
1054 push(@av_paren_type, $type);
1055 push(@av_paren_type, $type);
1056 $type = 'E';
1057
1058 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1059 print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1060 $av_preprocessor = 1;
1061
1062 push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1063
1064 $type = 'E';
1065
1066 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1067 print "PRE_END($1)\n" if ($dbg_values > 1);
1068
1069 $av_preprocessor = 1;
1070
1071 # Assume all arms of the conditional end as this
1072 # one does, and continue as if the #endif was not here.
1073 pop(@av_paren_type);
1074 push(@av_paren_type, $type);
1075 $type = 'E';
1076
1077 } elsif ($cur =~ /^(\\\n)/o) {
1078 print "PRECONT($1)\n" if ($dbg_values > 1);
1079
1080 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1081 print "ATTR($1)\n" if ($dbg_values > 1);
1082 $av_pending = $type;
1083 $type = 'N';
1084
1085 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1086 print "SIZEOF($1)\n" if ($dbg_values > 1);
1087 if (defined $2) {
1088 $av_pending = 'V';
1089 }
1090 $type = 'N';
1091
1092 } elsif ($cur =~ /^(if|while|for)\b/o) {
1093 print "COND($1)\n" if ($dbg_values > 1);
1094 $av_pending = 'E';
1095 $type = 'N';
1096
1097 } elsif ($cur =~/^(case)/o) {
1098 print "CASE($1)\n" if ($dbg_values > 1);
1099 $av_pend_colon = 'C';
1100 $type = 'N';
1101
1102 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1103 print "KEYWORD($1)\n" if ($dbg_values > 1);
1104 $type = 'N';
1105
1106 } elsif ($cur =~ /^(\()/o) {
1107 print "PAREN('$1')\n" if ($dbg_values > 1);
1108 push(@av_paren_type, $av_pending);
1109 $av_pending = '_';
1110 $type = 'N';
1111
1112 } elsif ($cur =~ /^(\))/o) {
1113 my $new_type = pop(@av_paren_type);
1114 if ($new_type ne '_') {
1115 $type = $new_type;
1116 print "PAREN('$1') -> $type\n"
1117 if ($dbg_values > 1);
1118 } else {
1119 print "PAREN('$1')\n" if ($dbg_values > 1);
1120 }
1121
1122 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1123 print "FUNC($1)\n" if ($dbg_values > 1);
1124 $type = 'V';
1125 $av_pending = 'V';
1126
1127 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1128 if (defined $2 && $type eq 'C' || $type eq 'T') {
1129 $av_pend_colon = 'B';
1130 } elsif ($type eq 'E') {
1131 $av_pend_colon = 'L';
1132 }
1133 print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1134 $type = 'V';
1135
1136 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1137 print "IDENT($1)\n" if ($dbg_values > 1);
1138 $type = 'V';
1139
1140 } elsif ($cur =~ /^($Assignment)/o) {
1141 print "ASSIGN($1)\n" if ($dbg_values > 1);
1142 $type = 'N';
1143
1144 } elsif ($cur =~/^(;|{|})/) {
1145 print "END($1)\n" if ($dbg_values > 1);
1146 $type = 'E';
1147 $av_pend_colon = 'O';
1148
1149 } elsif ($cur =~/^(,)/) {
1150 print "COMMA($1)\n" if ($dbg_values > 1);
1151 $type = 'C';
1152
1153 } elsif ($cur =~ /^(\?)/o) {
1154 print "QUESTION($1)\n" if ($dbg_values > 1);
1155 $type = 'N';
1156
1157 } elsif ($cur =~ /^(:)/o) {
1158 print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1159
1160 substr($var, length($res), 1, $av_pend_colon);
1161 if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1162 $type = 'E';
1163 } else {
1164 $type = 'N';
1165 }
1166 $av_pend_colon = 'O';
1167
1168 } elsif ($cur =~ /^(\[)/o) {
1169 print "CLOSE($1)\n" if ($dbg_values > 1);
1170 $type = 'N';
1171
1172 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1173 my $variant;
1174
1175 print "OPV($1)\n" if ($dbg_values > 1);
1176 if ($type eq 'V') {
1177 $variant = 'B';
1178 } else {
1179 $variant = 'U';
1180 }
1181
1182 substr($var, length($res), 1, $variant);
1183 $type = 'N';
1184
1185 } elsif ($cur =~ /^($Operators)/o) {
1186 print "OP($1)\n" if ($dbg_values > 1);
1187 if ($1 ne '++' && $1 ne '--') {
1188 $type = 'N';
1189 }
1190
1191 } elsif ($cur =~ /(^.)/o) {
1192 print "C($1)\n" if ($dbg_values > 1);
1193 }
1194 if (defined $1) {
1195 $cur = substr($cur, length($1));
1196 $res .= $type x length($1);
1197 }
1198 }
1199
1200 return ($res, $var);
1201}
1202
1203sub possible {
1204 my ($possible, $line) = @_;
1205 my $notPermitted = qr{(?:
1206 ^(?:
1207 $Modifier|
1208 $Storage|
1209 $Type|
1210 DEFINE_\S+
1211 )$|
1212 ^(?:
1213 goto|
1214 return|
1215 case|
1216 else|
1217 asm|__asm__|
1218 do|
1219 \#|
1220 \#\#|
1221 )(?:\s|$)|
1222 ^(?:typedef|struct|enum)\b
1223 )}x;
1224 warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1225 if ($possible !~ $notPermitted) {
1226 # Check for modifiers.
1227 $possible =~ s/\s*$Storage\s*//g;
1228 $possible =~ s/\s*$Sparse\s*//g;
1229 if ($possible =~ /^\s*$/) {
1230
1231 } elsif ($possible =~ /\s/) {
1232 $possible =~ s/\s*$Type\s*//g;
1233 for my $modifier (split(' ', $possible)) {
1234 if ($modifier !~ $notPermitted) {
1235 warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1236 push(@modifierList, $modifier);
1237 }
1238 }
1239
1240 } else {
1241 warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1242 push(@typeList, $possible);
1243 }
1244 build_types();
1245 } else {
1246 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1247 }
1248}
1249
1250my $prefix = '';
1251
1252sub show_type {
1253 return !defined $ignore_type{$_[0]};
1254}
1255
1256sub report {
1257 if (!show_type($_[1]) ||
1258 (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) {
1259 return 0;
1260 }
1261 my $line;
1262 if ($show_types) {
1263 $line = "$prefix$_[0]:$_[1]: $_[2]\n";
1264 } else {
1265 $line = "$prefix$_[0]: $_[2]\n";
1266 }
1267 $line = (split('\n', $line))[0] . "\n" if ($terse);
1268
1269 push(our @report, $line);
1270
1271 return 1;
1272}
1273sub report_dump {
1274 our @report;
1275}
1276
1277sub ERROR {
1278 if (report("ERROR", $_[0], $_[1])) {
1279 our $clean = 0;
1280 our $cnt_error++;
1281 }
1282}
1283sub WARN {
1284 if (report("WARNING", $_[0], $_[1])) {
1285 our $clean = 0;
1286 our $cnt_warn++;
1287 }
1288}
1289sub CHK {
1290 if ($check && report("CHECK", $_[0], $_[1])) {
1291 our $clean = 0;
1292 our $cnt_chk++;
1293 }
1294}
1295
1296sub check_absolute_file {
1297 my ($absolute, $herecurr) = @_;
1298 my $file = $absolute;
1299
1300 ##print "absolute<$absolute>\n";
1301
1302 # See if any suffix of this path is a path within the tree.
1303 while ($file =~ s@^[^/]*/@@) {
1304 if (-f "$root/$file") {
1305 ##print "file<$file>\n";
1306 last;
1307 }
1308 }
1309 if (! -f _) {
1310 return 0;
1311 }
1312
1313 # It is, so see if the prefix is acceptable.
1314 my $prefix = $absolute;
1315 substr($prefix, -length($file)) = '';
1316
1317 ##print "prefix<$prefix>\n";
1318 if ($prefix ne ".../") {
1319 WARN("USE_RELATIVE_PATH",
1320 "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1321 }
1322}
1323
1324sub pos_last_openparen {
1325 my ($line) = @_;
1326
1327 my $pos = 0;
1328
1329 my $opens = $line =~ tr/\(/\(/;
1330 my $closes = $line =~ tr/\)/\)/;
1331
1332 my $last_openparen = 0;
1333
1334 if (($opens == 0) || ($closes >= $opens)) {
1335 return -1;
1336 }
1337
1338 my $len = length($line);
1339
1340 for ($pos = 0; $pos < $len; $pos++) {
1341 my $string = substr($line, $pos);
1342 if ($string =~ /^($FuncArg|$balanced_parens)/) {
1343 $pos += length($1) - 1;
1344 } elsif (substr($line, $pos, 1) eq '(') {
1345 $last_openparen = $pos;
1346 } elsif (index($string, '(') == -1) {
1347 last;
1348 }
1349 }
1350
1351 return $last_openparen + 1;
1352}
1353
1354sub process {
1355 my $filename = shift;
1356
1357 my $linenr=0;
1358 my $prevline="";
1359 my $prevrawline="";
1360 my $stashline="";
1361 my $stashrawline="";
1362
1363 my $length;
1364 my $indent;
1365 my $previndent=0;
1366 my $stashindent=0;
1367
1368 our $clean = 1;
1369 my $signoff = 0;
1370 my $is_patch = 0;
1371
1372 my $in_header_lines = 1;
1373 my $in_commit_log = 0; #Scanning lines before patch
1374
1375 my $non_utf8_charset = 0;
1376
1377 our @report = ();
1378 our $cnt_lines = 0;
1379 our $cnt_error = 0;
1380 our $cnt_warn = 0;
1381 our $cnt_chk = 0;
1382
1383 # Trace the real file/line as we go.
1384 my $realfile = '';
1385 my $realline = 0;
1386 my $realcnt = 0;
1387 my $here = '';
1388 my $in_comment = 0;
1389 my $comment_edge = 0;
1390 my $first_line = 0;
1391 my $p1_prefix = '';
1392
1393 my $prev_values = 'E';
1394
1395 # suppression flags
1396 my %suppress_ifbraces;
1397 my %suppress_whiletrailers;
1398 my %suppress_export;
1399 my $suppress_statement = 0;
1400
1401 my %camelcase = ();
1402
1403 # Pre-scan the patch sanitizing the lines.
1404 # Pre-scan the patch looking for any __setup documentation.
1405 #
1406 my @setup_docs = ();
1407 my $setup_docs = 0;
1408
1409 sanitise_line_reset();
1410 my $line;
1411 foreach my $rawline (@rawlines) {
1412 $linenr++;
1413 $line = $rawline;
1414
1415 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1416 $setup_docs = 0;
1417 if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1418 $setup_docs = 1;
1419 }
1420 #next;
1421 }
1422 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1423 $realline=$1-1;
1424 if (defined $2) {
1425 $realcnt=$3+1;
1426 } else {
1427 $realcnt=1+1;
1428 }
1429 $in_comment = 0;
1430
1431 # Guestimate if this is a continuing comment. Run
1432 # the context looking for a comment "edge". If this
1433 # edge is a close comment then we must be in a comment
1434 # at context start.
1435 my $edge;
1436 my $cnt = $realcnt;
1437 for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1438 next if (defined $rawlines[$ln - 1] &&
1439 $rawlines[$ln - 1] =~ /^-/);
1440 $cnt--;
1441 #print "RAW<$rawlines[$ln - 1]>\n";
1442 last if (!defined $rawlines[$ln - 1]);
1443 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1444 $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1445 ($edge) = $1;
1446 last;
1447 }
1448 }
1449 if (defined $edge && $edge eq '*/') {
1450 $in_comment = 1;
1451 }
1452
1453 # Guestimate if this is a continuing comment. If this
1454 # is the start of a diff block and this line starts
1455 # ' *' then it is very likely a comment.
1456 if (!defined $edge &&
1457 $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1458 {
1459 $in_comment = 1;
1460 }
1461
1462 ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1463 sanitise_line_reset($in_comment);
1464
1465 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1466 # Standardise the strings and chars within the input to
1467 # simplify matching -- only bother with positive lines.
1468 $line = sanitise_line($rawline);
1469 }
1470 push(@lines, $line);
1471
1472 if ($realcnt > 1) {
1473 $realcnt-- if ($line =~ /^(?:\+| |$)/);
1474 } else {
1475 $realcnt = 0;
1476 }
1477
1478 #print "==>$rawline\n";
1479 #print "-->$line\n";
1480
1481 if ($setup_docs && $line =~ /^\+/) {
1482 push(@setup_docs, $line);
1483 }
1484 }
1485
1486 $prefix = '';
1487
1488 $realcnt = 0;
1489 $linenr = 0;
1490 foreach my $line (@lines) {
1491 $linenr++;
1492
1493 my $rawline = $rawlines[$linenr - 1];
1494
1495#extract the line range in the file after the patch is applied
1496 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1497 $is_patch = 1;
1498 $first_line = $linenr + 1;
1499 $realline=$1-1;
1500 if (defined $2) {
1501 $realcnt=$3+1;
1502 } else {
1503 $realcnt=1+1;
1504 }
1505 annotate_reset();
1506 $prev_values = 'E';
1507
1508 %suppress_ifbraces = ();
1509 %suppress_whiletrailers = ();
1510 %suppress_export = ();
1511 $suppress_statement = 0;
1512 next;
1513
1514# track the line number as we move through the hunk, note that
1515# new versions of GNU diff omit the leading space on completely
1516# blank context lines so we need to count that too.
1517 } elsif ($line =~ /^( |\+|$)/) {
1518 $realline++;
1519 $realcnt-- if ($realcnt != 0);
1520
1521 # Measure the line length and indent.
1522 ($length, $indent) = line_stats($rawline);
1523
1524 # Track the previous line.
1525 ($prevline, $stashline) = ($stashline, $line);
1526 ($previndent, $stashindent) = ($stashindent, $indent);
1527 ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1528
1529 #warn "line<$line>\n";
1530
1531 } elsif ($realcnt == 1) {
1532 $realcnt--;
1533 }
1534
1535 my $hunk_line = ($realcnt != 0);
1536
1537#make up the handle for any error we report on this line
1538 $prefix = "$filename:$realline: " if ($emacs && $file);
1539 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1540
1541 $here = "#$linenr: " if (!$file);
1542 $here = "#$realline: " if ($file);
1543
1544 # extract the filename as it passes
1545 if ($line =~ /^diff --git.*?(\S+)$/) {
1546 $realfile = $1;
1547 $realfile =~ s@^([^/]*)/@@;
1548 $in_commit_log = 0;
1549 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1550 $realfile = $1;
1551 $realfile =~ s@^([^/]*)/@@;
1552 $in_commit_log = 0;
1553
1554 $p1_prefix = $1;
1555 if (!$file && $tree && $p1_prefix ne '' &&
1556 -e "$root/$p1_prefix") {
1557 WARN("PATCH_PREFIX",
1558 "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1559 }
1560
1561 if ($realfile =~ m@^include/asm/@) {
1562 ERROR("MODIFIED_INCLUDE_ASM",
1563 "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1564 }
1565 next;
1566 }
1567
1568 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1569
1570 my $hereline = "$here\n$rawline\n";
1571 my $herecurr = "$here\n$rawline\n";
1572 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1573
1574 $cnt_lines++ if ($realcnt != 0);
1575
1576# Check for incorrect file permissions
1577 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1578 my $permhere = $here . "FILE: $realfile\n";
1579 if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1580 ERROR("EXECUTE_PERMISSIONS",
1581 "do not set execute permissions for source files\n" . $permhere);
1582 }
1583 }
1584
1585# Check the patch for a signoff:
1586 if ($line =~ /^\s*signed-off-by:/i) {
1587 $signoff++;
1588 $in_commit_log = 0;
1589 }
1590
1591# Check signature styles
1592 if (!$in_header_lines &&
1593 $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
1594 my $space_before = $1;
1595 my $sign_off = $2;
1596 my $space_after = $3;
1597 my $email = $4;
1598 my $ucfirst_sign_off = ucfirst(lc($sign_off));
1599
1600 if ($sign_off !~ /$signature_tags/) {
1601 WARN("BAD_SIGN_OFF",
1602 "Non-standard signature: $sign_off\n" . $herecurr);
1603 }
1604 if (defined $space_before && $space_before ne "") {
1605 WARN("BAD_SIGN_OFF",
1606 "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
1607 }
1608 if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
1609 WARN("BAD_SIGN_OFF",
1610 "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr);
1611 }
1612 if (!defined $space_after || $space_after ne " ") {
1613 WARN("BAD_SIGN_OFF",
1614 "Use a single space after $ucfirst_sign_off\n" . $herecurr);
1615 }
1616
1617 my ($email_name, $email_address, $comment) = parse_email($email);
1618 my $suggested_email = format_email(($email_name, $email_address));
1619 if ($suggested_email eq "") {
1620 ERROR("BAD_SIGN_OFF",
1621 "Unrecognized email address: '$email'\n" . $herecurr);
1622 } else {
1623 my $dequoted = $suggested_email;
1624 $dequoted =~ s/^"//;
1625 $dequoted =~ s/" </ </;
1626 # Don't force email to have quotes
1627 # Allow just an angle bracketed address
1628 if ("$dequoted$comment" ne $email &&
1629 "<$email_address>$comment" ne $email &&
1630 "$suggested_email$comment" ne $email) {
1631 WARN("BAD_SIGN_OFF",
1632 "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
1633 }
1634 }
1635 }
1636
1637# Check for wrappage within a valid hunk of the file
1638 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1639 ERROR("CORRUPTED_PATCH",
1640 "patch seems to be corrupt (line wrapped?)\n" .
1641 $herecurr) if (!$emitted_corrupt++);
1642 }
1643
1644# Check for absolute kernel paths.
1645 if ($tree) {
1646 while ($line =~ m{(?:^|\s)(/\S*)}g) {
1647 my $file = $1;
1648
1649 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1650 check_absolute_file($1, $herecurr)) {
1651 #
1652 } else {
1653 check_absolute_file($file, $herecurr);
1654 }
1655 }
1656 }
1657
1658# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1659 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1660 $rawline !~ m/^$UTF8*$/) {
1661 my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1662
1663 my $blank = copy_spacing($rawline);
1664 my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1665 my $hereptr = "$hereline$ptr\n";
1666
1667 CHK("INVALID_UTF8",
1668 "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1669 }
1670
1671# Check if it's the start of a commit log
1672# (not a header line and we haven't seen the patch filename)
1673 if ($in_header_lines && $realfile =~ /^$/ &&
1674 $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) {
1675 $in_header_lines = 0;
1676 $in_commit_log = 1;
1677 }
1678
1679# Check if there is UTF-8 in a commit log when a mail header has explicitly
1680# declined it, i.e defined some charset where it is missing.
1681 if ($in_header_lines &&
1682 $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1683 $1 !~ /utf-8/i) {
1684 $non_utf8_charset = 1;
1685 }
1686
1687 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1688 $rawline =~ /$NON_ASCII_UTF8/) {
1689 WARN("UTF8_BEFORE_PATCH",
1690 "8-bit UTF-8 used in possible commit log\n" . $herecurr);
1691 }
1692
1693# ignore non-hunk lines and lines being removed
1694 next if (!$hunk_line || $line =~ /^-/);
1695
1696#trailing whitespace
1697 if ($line =~ /^\+.*\015/) {
1698 my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1699 ERROR("DOS_LINE_ENDINGS",
1700 "DOS line endings\n" . $herevet);
1701
1702 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1703 my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1704 ERROR("TRAILING_WHITESPACE",
1705 "trailing whitespace\n" . $herevet);
1706 $rpt_cleaners = 1;
1707 }
1708
1709# check for Kconfig help text having a real description
1710# Only applies when adding the entry originally, after that we do not have
1711# sufficient context to determine whether it is indeed long enough.
1712 if ($realfile =~ /Kconfig/ &&
1713 $line =~ /.\s*config\s+/) {
1714 my $length = 0;
1715 my $cnt = $realcnt;
1716 my $ln = $linenr + 1;
1717 my $f;
1718 my $is_start = 0;
1719 my $is_end = 0;
1720 for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
1721 $f = $lines[$ln - 1];
1722 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1723 $is_end = $lines[$ln - 1] =~ /^\+/;
1724
1725 next if ($f =~ /^-/);
1726
1727 if ($lines[$ln - 1] =~ /.\s*(?:bool|tristate)\s*\"/) {
1728 $is_start = 1;
1729 } elsif ($lines[$ln - 1] =~ /.\s*(?:---)?help(?:---)?$/) {
1730 $length = -1;
1731 }
1732
1733 $f =~ s/^.//;
1734 $f =~ s/#.*//;
1735 $f =~ s/^\s+//;
1736 next if ($f =~ /^$/);
1737 if ($f =~ /^\s*config\s/) {
1738 $is_end = 1;
1739 last;
1740 }
1741 $length++;
1742 }
1743 WARN("CONFIG_DESCRIPTION",
1744 "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_start && $is_end && $length < 4);
1745 #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
1746 }
1747
1748# discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
1749 if ($realfile =~ /Kconfig/ &&
1750 $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
1751 WARN("CONFIG_EXPERIMENTAL",
1752 "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
1753 }
1754
1755 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
1756 ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
1757 my $flag = $1;
1758 my $replacement = {
1759 'EXTRA_AFLAGS' => 'asflags-y',
1760 'EXTRA_CFLAGS' => 'ccflags-y',
1761 'EXTRA_CPPFLAGS' => 'cppflags-y',
1762 'EXTRA_LDFLAGS' => 'ldflags-y',
1763 };
1764
1765 WARN("DEPRECATED_VARIABLE",
1766 "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
1767 }
1768
1769# check we are in a valid source file if not then ignore this hunk
1770 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1771
1772#line length limit
1773 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1774 $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1775 !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
1776 $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1777 $length > $max_line_length)
1778 {
1779 WARN("LONG_LINE",
1780 "line over $max_line_length characters\n" . $herecurr);
1781 }
1782
1783# Check for user-visible strings broken across lines, which breaks the ability
1784# to grep for the string. Limited to strings used as parameters (those
1785# following an open parenthesis), which almost completely eliminates false
1786# positives, as well as warning only once per parameter rather than once per
1787# line of the string. Make an exception when the previous string ends in a
1788# newline (multiple lines in one string constant) or \n\t (common in inline
1789# assembly to indent the instruction on the following line).
1790 if ($line =~ /^\+\s*"/ &&
1791 $prevline =~ /"\s*$/ &&
1792 $prevline =~ /\(/ &&
1793 $prevrawline !~ /\\n(?:\\t)*"\s*$/) {
1794 WARN("SPLIT_STRING",
1795 "quoted string split across lines\n" . $hereprev);
1796 }
1797
1798# check for spaces before a quoted newline
1799 if ($rawline =~ /^.*\".*\s\\n/) {
1800 WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
1801 "unnecessary whitespace before a quoted newline\n" . $herecurr);
1802 }
1803
1804# check for adding lines without a newline.
1805 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1806 WARN("MISSING_EOF_NEWLINE",
1807 "adding a line without newline at end of file\n" . $herecurr);
1808 }
1809
1810# Blackfin: use hi/lo macros
1811 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1812 if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1813 my $herevet = "$here\n" . cat_vet($line) . "\n";
1814 ERROR("LO_MACRO",
1815 "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1816 }
1817 if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1818 my $herevet = "$here\n" . cat_vet($line) . "\n";
1819 ERROR("HI_MACRO",
1820 "use the HI() macro, not (... >> 16)\n" . $herevet);
1821 }
1822 }
1823
1824# check we are in a valid source file C or perl if not then ignore this hunk
1825 next if ($realfile !~ /\.(h|c|pl)$/);
1826
1827# at the beginning of a line any tabs must come first and anything
1828# more than 8 must use tabs.
1829 if ($rawline =~ /^\+\s* \t\s*\S/ ||
1830 $rawline =~ /^\+\s* \s*/) {
1831 my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1832 ERROR("CODE_INDENT",
1833 "code indent should use tabs where possible\n" . $herevet);
1834 $rpt_cleaners = 1;
1835 }
1836
1837# check for space before tabs.
1838 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1839 my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1840 WARN("SPACE_BEFORE_TAB",
1841 "please, no space before tabs\n" . $herevet);
1842 }
1843
1844# check for && or || at the start of a line
1845 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
1846 CHK("LOGICAL_CONTINUATIONS",
1847 "Logical continuations should be on the previous line\n" . $hereprev);
1848 }
1849
1850# check multi-line statement indentation matches previous line
1851 if ($^V && $^V ge 5.10.0 &&
1852 $prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/) {
1853 $prevline =~ /^\+(\t*)(.*)$/;
1854 my $oldindent = $1;
1855 my $rest = $2;
1856
1857 my $pos = pos_last_openparen($rest);
1858 if ($pos >= 0) {
1859 $line =~ /^(\+| )([ \t]*)/;
1860 my $newindent = $2;
1861
1862 my $goodtabindent = $oldindent .
36f001b3
DG		 1863 "\t" x ($pos / 4) .
1864 " " x ($pos % 4);
41ab1dbe
CB		 1865 my $goodspaceindent = $oldindent . " " x $pos;
1866
1867 if ($newindent ne $goodtabindent &&
1868 $newindent ne $goodspaceindent) {
1869 CHK("PARENTHESIS_ALIGNMENT",
1870 "Alignment should match open parenthesis\n" . $hereprev);
1871 }
1872 }
1873 }
1874
1875 if ($line =~ /^\+.*\*[ \t]*\)[ \t]+/) {
1876 CHK("SPACING",
1877 "No space is necessary after a cast\n" . $hereprev);
1878 }
1879
1880 if ($realfile =~ m@^(drivers/net/|net/)@ &&
1881 $rawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
1882 $prevrawline =~ /^\+[ \t]*$/) {
1883 WARN("NETWORKING_BLOCK_COMMENT_STYLE",
1884 "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
1885 }
1886
1887 if ($realfile =~ m@^(drivers/net/|net/)@ &&
1888 $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ && #trailing */
1889 $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ && #inline /*...*/
1890 $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ && #trailing **/
1891 $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) { #non blank */
1892 WARN("NETWORKING_BLOCK_COMMENT_STYLE",
1893 "networking block comments put the trailing */ on a separate line\n" . $herecurr);
1894 }
1895
1896# check for spaces at the beginning of a line.
1897# Exceptions:
1898# 1) within comments
1899# 2) indented preprocessor commands
1900# 3) hanging labels
1901 if ($rawline =~ /^\+ / && $line !~ /\+ *(?:$;|#|$Ident:)/) {
1902 my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1903 WARN("LEADING_SPACE",
1904 "please, no spaces at the start of a line\n" . $herevet);
1905 }
1906
1907# check we are in a valid C source file if not then ignore this hunk
1908 next if ($realfile !~ /\.(h|c)$/);
1909
1910# discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
1911 if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
1912 WARN("CONFIG_EXPERIMENTAL",
1913 "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
1914 }
1915
1916# check for RCS/CVS revision markers
1917 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1918 WARN("CVS_KEYWORD",
1919 "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1920 }
1921
1922# Blackfin: don't use __builtin_bfin_[cs]sync
1923 if ($line =~ /__builtin_bfin_csync/) {
1924 my $herevet = "$here\n" . cat_vet($line) . "\n";
1925 ERROR("CSYNC",
1926 "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1927 }
1928 if ($line =~ /__builtin_bfin_ssync/) {
1929 my $herevet = "$here\n" . cat_vet($line) . "\n";
1930 ERROR("SSYNC",
1931 "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1932 }
1933
1934# Check for potential 'bare' types
1935 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1936 $realline_next);
1937#print "LINE<$line>\n";
1938 if ($linenr >= $suppress_statement &&
1939 $realcnt && $line =~ /.\s*\S/) {
1940 ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1941 ctx_statement_block($linenr, $realcnt, 0);
1942 $stat =~ s/\n./\n /g;
1943 $cond =~ s/\n./\n /g;
1944
1945#print "linenr<$linenr> <$stat>\n";
1946 # If this statement has no statement boundaries within
1947 # it there is no point in retrying a statement scan
1948 # until we hit end of it.
1949 my $frag = $stat; $frag =~ s/;+\s*$//;
1950 if ($frag !~ /(?:{|;)/) {
1951#print "skip<$line_nr_next>\n";
1952 $suppress_statement = $line_nr_next;
1953 }
1954
1955 # Find the real next line.
1956 $realline_next = $line_nr_next;
1957 if (defined $realline_next &&
1958 (!defined $lines[$realline_next - 1] ||
1959 substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1960 $realline_next++;
1961 }
1962
1963 my $s = $stat;
1964 $s =~ s/{.*$//s;
1965
1966 # Ignore goto labels.
1967 if ($s =~ /$Ident:\*$/s) {
1968
1969 # Ignore functions being called
1970 } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1971
1972 } elsif ($s =~ /^.\s*else\b/s) {
1973
1974 # declarations always start with types
1975 } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1976 my $type = $1;
1977 $type =~ s/\s+/ /g;
1978 possible($type, "A:" . $s);
1979
1980 # definitions in global scope can only start with types
1981 } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1982 possible($1, "B:" . $s);
1983 }
1984
1985 # any (foo ... *) is a pointer cast, and foo is a type
1986 while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1987 possible($1, "C:" . $s);
1988 }
1989
1990 # Check for any sort of function declaration.
1991 # int foo(something bar, other baz);
1992 # void (*store_gdt)(x86_descr_ptr *);
1993 if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1994 my ($name_len) = length($1);
1995
1996 my $ctx = $s;
1997 substr($ctx, 0, $name_len + 1, '');
1998 $ctx =~ s/\)[^\)]*$//;
1999
2000 for my $arg (split(/\s*,\s*/, $ctx)) {
2001 if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
2002
2003 possible($1, "D:" . $s);
2004 }
2005 }
2006 }
2007
2008 }
2009
2010#
2011# Checks which may be anchored in the context.
2012#
2013
2014# Check for switch () and associated case and default
2015# statements should be at the same indent.
2016 if ($line=~/\bswitch\s*\(.*\)/) {
2017 my $err = '';
2018 my $sep = '';
2019 my @ctx = ctx_block_outer($linenr, $realcnt);
2020 shift(@ctx);
2021 for my $ctx (@ctx) {
2022 my ($clen, $cindent) = line_stats($ctx);
2023 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
2024 $indent != $cindent) {
2025 $err .= "$sep$ctx\n";
2026 $sep = '';
2027 } else {
2028 $sep = "[...]\n";
2029 }
2030 }
2031 if ($err ne '') {
2032 ERROR("SWITCH_CASE_INDENT_LEVEL",
2033 "switch and case should be at the same indent\n$hereline$err");
2034 }
2035 }
2036
2037# if/while/etc brace do not go on next line, unless defining a do while loop,
2038# or if that brace on the next line is for something else
2039 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
2040 my $pre_ctx = "$1$2";
2041
2042 my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
2043
2044 if ($line =~ /^\+\t{6,}/) {
2045 WARN("DEEP_INDENTATION",
2046 "Too many leading tabs - consider code refactoring\n" . $herecurr);
2047 }
2048
2049 my $ctx_cnt = $realcnt - $#ctx - 1;
2050 my $ctx = join("\n", @ctx);
2051
2052 my $ctx_ln = $linenr;
2053 my $ctx_skip = $realcnt;
2054
2055 while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
2056 defined $lines[$ctx_ln - 1] &&
2057 $lines[$ctx_ln - 1] =~ /^-/)) {
2058 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
2059 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
2060 $ctx_ln++;
2061 }
2062
2063 #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
2064 #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
2065
2066 if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
2067 ERROR("OPEN_BRACE",
2068 "that open brace { should be on the previous line\n" .
2069 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2070 }
2071 if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
2072 $ctx =~ /\)\s*\;\s*$/ &&
2073 defined $lines[$ctx_ln - 1])
2074 {
2075 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
2076 if ($nindent > $indent) {
2077 WARN("TRAILING_SEMICOLON",
2078 "trailing semicolon indicates no statements, indent implies otherwise\n" .
2079 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2080 }
2081 }
2082 }
2083
2084# Check relative indent for conditionals and blocks.
2085 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
2086 ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2087 ctx_statement_block($linenr, $realcnt, 0)
2088 if (!defined $stat);
2089 my ($s, $c) = ($stat, $cond);
2090
2091 substr($s, 0, length($c), '');
2092
2093 # Make sure we remove the line prefixes as we have
2094 # none on the first line, and are going to readd them
2095 # where necessary.
2096 $s =~ s/\n./\n/gs;
2097
2098 # Find out how long the conditional actually is.
2099 my @newlines = ($c =~ /\n/gs);
2100 my $cond_lines = 1 + $#newlines;
2101
2102 # We want to check the first line inside the block
2103 # starting at the end of the conditional, so remove:
2104 # 1) any blank line termination
2105 # 2) any opening brace { on end of the line
2106 # 3) any do (...) {
2107 my $continuation = 0;
2108 my $check = 0;
2109 $s =~ s/^.*\bdo\b//;
2110 $s =~ s/^\s*{//;
2111 if ($s =~ s/^\s*\\//) {
2112 $continuation = 1;
2113 }
2114 if ($s =~ s/^\s*?\n//) {
2115 $check = 1;
2116 $cond_lines++;
2117 }
2118
2119 # Also ignore a loop construct at the end of a
2120 # preprocessor statement.
2121 if (($prevline =~ /^.\s*#\s*define\s/ ||
2122 $prevline =~ /\\\s*$/) && $continuation == 0) {
2123 $check = 0;
2124 }
2125
2126 my $cond_ptr = -1;
2127 $continuation = 0;
2128 while ($cond_ptr != $cond_lines) {
2129 $cond_ptr = $cond_lines;
2130
2131 # If we see an #else/#elif then the code
2132 # is not linear.
2133 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2134 $check = 0;
2135 }
2136
2137 # Ignore:
2138 # 1) blank lines, they should be at 0,
2139 # 2) preprocessor lines, and
2140 # 3) labels.
2141 if ($continuation ||
2142 $s =~ /^\s*?\n/ ||
2143 $s =~ /^\s*#\s*?/ ||
2144 $s =~ /^\s*$Ident\s*:/) {
2145 $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2146 if ($s =~ s/^.*?\n//) {
2147 $cond_lines++;
2148 }
2149 }
2150 }
2151
2152 my (undef, $sindent) = line_stats("+" . $s);
2153 my $stat_real = raw_line($linenr, $cond_lines);
2154
2155 # Check if either of these lines are modified, else
2156 # this is not this patch's fault.
2157 if (!defined($stat_real) ||
2158 $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2159 $check = 0;
2160 }
2161 if (defined($stat_real) && $cond_lines > 1) {
2162 $stat_real = "[...]\n$stat_real";
2163 }
2164
2165 #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";
2166
36f001b3 2167 if ($check && (($sindent % 4) != 0 ||
41ab1dbe
CB		 2168 ($sindent <= $indent && $s ne ''))) {
2169 WARN("SUSPECT_CODE_INDENT",
2170 "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2171 }
2172 }
2173
2174 # Track the 'values' across context and added lines.
2175 my $opline = $line; $opline =~ s/^./ /;
2176 my ($curr_values, $curr_vars) =
2177 annotate_values($opline . "\n", $prev_values);
2178 $curr_values = $prev_values . $curr_values;
2179 if ($dbg_values) {
2180 my $outline = $opline; $outline =~ s/\t/ /g;
2181 print "$linenr > .$outline\n";
2182 print "$linenr > $curr_values\n";
2183 print "$linenr > $curr_vars\n";
2184 }
2185 $prev_values = substr($curr_values, -1);
2186
2187#ignore lines not being added
2188 if ($line=~/^[^\+]/) {next;}
2189
2190# TEST: allow direct testing of the type matcher.
2191 if ($dbg_type) {
2192 if ($line =~ /^.\s*$Declare\s*$/) {
2193 ERROR("TEST_TYPE",
2194 "TEST: is type\n" . $herecurr);
2195 } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2196 ERROR("TEST_NOT_TYPE",
2197 "TEST: is not type ($1 is)\n". $herecurr);
2198 }
2199 next;
2200 }
2201# TEST: allow direct testing of the attribute matcher.
2202 if ($dbg_attr) {
2203 if ($line =~ /^.\s*$Modifier\s*$/) {
2204 ERROR("TEST_ATTR",
2205 "TEST: is attr\n" . $herecurr);
2206 } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2207 ERROR("TEST_NOT_ATTR",
2208 "TEST: is not attr ($1 is)\n". $herecurr);
2209 }
2210 next;
2211 }
2212
2213# check for initialisation to aggregates open brace on the next line
2214 if ($line =~ /^.\s*{/ &&
2215 $prevline =~ /(?:^|[^=])=\s*$/) {
2216 ERROR("OPEN_BRACE",
2217 "that open brace { should be on the previous line\n" . $hereprev);
2218 }
2219
2220#
2221# Checks which are anchored on the added line.
2222#
2223
2224# check for malformed paths in #include statements (uses RAW line)
2225 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
2226 my $path = $1;
2227 if ($path =~ m{//}) {
2228 ERROR("MALFORMED_INCLUDE",
2229 "malformed #include filename\n" . $herecurr);
2230 }
2231 if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
2232 ERROR("UAPI_INCLUDE",
2233 "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
2234 }
2235 }
2236
2237# no C99 // comments
2238 if ($line =~ m{//}) {
2239 ERROR("C99_COMMENTS",
2240 "do not use C99 // comments\n" . $herecurr);
2241 }
2242 # Remove C99 comments.
2243 $line =~ s@//.*@@;
2244 $opline =~ s@//.*@@;
2245
2246# EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
2247# the whole statement.
2248#print "APW <$lines[$realline_next - 1]>\n";
2249 if (defined $realline_next &&
2250 exists $lines[$realline_next - 1] &&
2251 !defined $suppress_export{$realline_next} &&
2252 ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2253 $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2254 # Handle definitions which produce identifiers with
2255 # a prefix:
2256 # XXX(foo);
2257 # EXPORT_SYMBOL(something_foo);
2258 my $name = $1;
2259 if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
2260 $name =~ /^${Ident}_$2/) {
2261#print "FOO C name<$name>\n";
2262 $suppress_export{$realline_next} = 1;
2263
2264 } elsif ($stat !~ /(?:
2265 \n.}\s*$|
2266 ^.DEFINE_$Ident\(\Q$name\E\)|
2267 ^.DECLARE_$Ident\(\Q$name\E\)|
2268 ^.LIST_HEAD\(\Q$name\E\)|
2269 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
2270 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
2271 )/x) {
2272#print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
2273 $suppress_export{$realline_next} = 2;
2274 } else {
2275 $suppress_export{$realline_next} = 1;
2276 }
2277 }
2278 if (!defined $suppress_export{$linenr} &&
2279 $prevline =~ /^.\s*$/ &&
2280 ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2281 $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2282#print "FOO B <$lines[$linenr - 1]>\n";
2283 $suppress_export{$linenr} = 2;
2284 }
2285 if (defined $suppress_export{$linenr} &&
2286 $suppress_export{$linenr} == 2) {
2287 WARN("EXPORT_SYMBOL",
2288 "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
2289 }
2290
2291# check for global initialisers.
2292 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2293 ERROR("GLOBAL_INITIALISERS",
2294 "do not initialise globals to 0 or NULL\n" .
2295 $herecurr);
2296 }
2297# check for static initialisers.
2298 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2299 ERROR("INITIALISED_STATIC",
2300 "do not initialise statics to 0 or NULL\n" .
2301 $herecurr);
2302 }
2303
2304# check for static const char * arrays.
2305 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
2306 WARN("STATIC_CONST_CHAR_ARRAY",
2307 "static const char * array should probably be static const char * const\n" .
2308 $herecurr);
2309 }
2310
2311# check for static char foo[] = "bar" declarations.
2312 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
2313 WARN("STATIC_CONST_CHAR_ARRAY",
2314 "static char array declaration should probably be static const char\n" .
2315 $herecurr);
2316 }
2317
2318# check for declarations of struct pci_device_id
2319 if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
2320 WARN("DEFINE_PCI_DEVICE_TABLE",
2321 "Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id\n" . $herecurr);
2322 }
2323
2324# check for new typedefs, only function parameters and sparse annotations
2325# make sense.
2326 if ($line =~ /\btypedef\s/ &&
2327 $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
2328 $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
2329 $line !~ /\b$typeTypedefs\b/ &&
2330 $line !~ /\b__bitwise(?:__|)\b/) {
2331 WARN("NEW_TYPEDEFS",
2332 "do not add new typedefs\n" . $herecurr);
2333 }
2334
2335# * goes on variable not on type
2336 # (char*[ const])
2337 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
2338 #print "AA<$1>\n";
2339 my ($from, $to) = ($2, $2);
2340
2341 # Should start with a space.
2342 $to =~ s/^(\S)/ $1/;
2343 # Should not end with a space.
2344 $to =~ s/\s+$//;
2345 # '*'s should not have spaces between.
2346 while ($to =~ s/\*\s+\*/\*\*/) {
2347 }
2348
2349 #print "from<$from> to<$to>\n";
2350 if ($from ne $to) {
2351 ERROR("POINTER_LOCATION",
2352 "\"(foo$from)\" should be \"(foo$to)\"\n" . $herecurr);
2353 }
2354 }
2355 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
2356 #print "BB<$1>\n";
2357 my ($from, $to, $ident) = ($2, $2, $3);
2358
2359 # Should start with a space.
2360 $to =~ s/^(\S)/ $1/;
2361 # Should not end with a space.
2362 $to =~ s/\s+$//;
2363 # '*'s should not have spaces between.
2364 while ($to =~ s/\*\s+\*/\*\*/) {
2365 }
2366 # Modifiers should have spaces.
2367 $to =~ s/(\b$Modifier$)/$1 /;
2368
2369 #print "from<$from> to<$to> ident<$ident>\n";
2370 if ($from ne $to && $ident !~ /^$Modifier$/) {
2371 ERROR("POINTER_LOCATION",
2372 "\"foo${from}bar\" should be \"foo${to}bar\"\n" . $herecurr);
2373 }
2374 }
2375
2376# # no BUG() or BUG_ON()
2377# if ($line =~ /\b(BUG|BUG_ON)\b/) {
2378# print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
2379# print "$herecurr";
2380# $clean = 0;
2381# }
2382
2383 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
2384 WARN("LINUX_VERSION_CODE",
2385 "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
2386 }
2387
2388# check for uses of printk_ratelimit
2389 if ($line =~ /\bprintk_ratelimit\s*\(/) {
2390 WARN("PRINTK_RATELIMITED",
2391"Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
2392 }
2393
2394# printk should use KERN_* levels. Note that follow on printk's on the
2395# same line do not need a level, so we use the current block context
2396# to try and find and validate the current printk. In summary the current
2397# printk includes all preceding printk's which have no newline on the end.
2398# we assume the first bad printk is the one to report.
2399 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
2400 my $ok = 0;
2401 for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
2402 #print "CHECK<$lines[$ln - 1]\n";
2403 # we have a preceding printk if it ends
2404 # with "\n" ignore it, else it is to blame
2405 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
2406 if ($rawlines[$ln - 1] !~ m{\\n"}) {
2407 $ok = 1;
2408 }
2409 last;
2410 }
2411 }
2412 if ($ok == 0) {
2413 WARN("PRINTK_WITHOUT_KERN_LEVEL",
2414 "printk() should include KERN_ facility level\n" . $herecurr);
2415 }
2416 }
2417
2418 if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
2419 my $orig = $1;
2420 my $level = lc($orig);
2421 $level = "warn" if ($level eq "warning");
2422 my $level2 = $level;
2423 $level2 = "dbg" if ($level eq "debug");
2424 WARN("PREFER_PR_LEVEL",
2425 "Prefer netdev_$level2(netdev, ... then dev_$level2(dev, ... then pr_$level(... to printk(KERN_$orig ...\n" . $herecurr);
2426 }
2427
2428 if ($line =~ /\bpr_warning\s*\(/) {
2429 WARN("PREFER_PR_LEVEL",
2430 "Prefer pr_warn(... to pr_warning(...\n" . $herecurr);
2431 }
2432
2433# function brace can't be on same line, except for #defines of do while,
2434# or if closed on same line
2435 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
2436 !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
2437 ERROR("OPEN_BRACE",
2438 "open brace '{' following function declarations go on the next line\n" . $herecurr);
2439 }
2440
2441# open braces for enum, union and struct go on the same line.
2442 if ($line =~ /^.\s*{/ &&
2443 $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2444 ERROR("OPEN_BRACE",
2445 "open brace '{' following $1 go on the same line\n" . $hereprev);
2446 }
2447
2448# missing space after union, struct or enum definition
2449 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2450 WARN("SPACING",
2451 "missing space after $1 definition\n" . $herecurr);
2452 }
2453
2454# check for spacing round square brackets; allowed:
2455# 1. with a type on the left -- int [] a;
2456# 2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2457# 3. inside a curly brace -- = { [0...10] = 5 }
2458 while ($line =~ /(.*?\s)\[/g) {
2459 my ($where, $prefix) = ($-[1], $1);
2460 if ($prefix !~ /$Type\s+$/ &&
2461 ($where != 0 || $prefix !~ /^.\s+$/) &&
2462 $prefix !~ /[{,]\s+$/) {
2463 ERROR("BRACKET_SPACE",
2464 "space prohibited before open square bracket '['\n" . $herecurr);
2465 }
2466 }
2467
2468# check for spaces between functions and their parentheses.
2469 while ($line =~ /($Ident)\s+\(/g) {
2470 my $name = $1;
2471 my $ctx_before = substr($line, 0, $-[1]);
2472 my $ctx = "$ctx_before$name";
2473
2474 # Ignore those directives where spaces _are_ permitted.
2475 if ($name =~ /^(?:
2476 if|for|while|switch|return|case|
2477 volatile|__volatile__|
2478 __attribute__|format|__extension__|
2479 asm|__asm__)$/x)
2480 {
2481
2482 # cpp #define statements have non-optional spaces, ie
2483 # if there is a space between the name and the open
2484 # parenthesis it is simply not a parameter group.
2485 } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2486
2487 # cpp #elif statement condition may start with a (
2488 } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2489
2490 # If this whole things ends with a type its most
2491 # likely a typedef for a function.
2492 } elsif ($ctx =~ /$Type$/) {
2493
2494 } else {
2495 WARN("SPACING",
2496 "space prohibited between function name and open parenthesis '('\n" . $herecurr);
2497 }
2498 }
2499
2500# check for whitespace before a non-naked semicolon
2501 if ($line =~ /^\+.*\S\s+;/) {
2502 CHK("SPACING",
2503 "space prohibited before semicolon\n" . $herecurr);
2504 }
2505
2506# Check operator spacing.
2507 if (!($line=~/\#\s*include/)) {
2508 my $ops = qr{
2509 <<=|>>=|<=|>=|==|!=|
2510 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2511 =>|->|<<|>>|<|>|=|!|~|
2512 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2513 \?|:
2514 }x;
2515 my @elements = split(/($ops|;)/, $opline);
2516 my $off = 0;
2517
2518 my $blank = copy_spacing($opline);
2519
2520 for (my $n = 0; $n < $#elements; $n += 2) {
2521 $off += length($elements[$n]);
2522
2523 # Pick up the preceding and succeeding characters.
2524 my $ca = substr($opline, 0, $off);
2525 my $cc = '';
2526 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2527 $cc = substr($opline, $off + length($elements[$n + 1]));
2528 }
2529 my $cb = "$ca$;$cc";
2530
2531 my $a = '';
2532 $a = 'V' if ($elements[$n] ne '');
2533 $a = 'W' if ($elements[$n] =~ /\s$/);
2534 $a = 'C' if ($elements[$n] =~ /$;$/);
2535 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2536 $a = 'O' if ($elements[$n] eq '');
2537 $a = 'E' if ($ca =~ /^\s*$/);
2538
2539 my $op = $elements[$n + 1];
2540
2541 my $c = '';
2542 if (defined $elements[$n + 2]) {
2543 $c = 'V' if ($elements[$n + 2] ne '');
2544 $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2545 $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2546 $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2547 $c = 'O' if ($elements[$n + 2] eq '');
2548 $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2549 } else {
2550 $c = 'E';
2551 }
2552
2553 my $ctx = "${a}x${c}";
2554
2555 my $at = "(ctx:$ctx)";
2556
2557 my $ptr = substr($blank, 0, $off) . "^";
2558 my $hereptr = "$hereline$ptr\n";
2559
2560 # Pull out the value of this operator.
2561 my $op_type = substr($curr_values, $off + 1, 1);
2562
2563 # Get the full operator variant.
2564 my $opv = $op . substr($curr_vars, $off, 1);
2565
2566 # Ignore operators passed as parameters.
2567 if ($op_type ne 'V' &&
2568 $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2569
2570# # Ignore comments
2571# } elsif ($op =~ /^$;+$/) {
2572
2573 # ; should have either the end of line or a space or \ after it
2574 } elsif ($op eq ';') {
2575 if ($ctx !~ /.x[WEBC]/ &&
2576 $cc !~ /^\\/ && $cc !~ /^;/) {
2577 ERROR("SPACING",
2578 "space required after that '$op' $at\n" . $hereptr);
2579 }
2580
2581 # // is a comment
2582 } elsif ($op eq '//') {
2583
2584 # No spaces for:
2585 # ->
2586 # : when part of a bitfield
2587 } elsif ($op eq '->' || $opv eq ':B') {
2588 if ($ctx =~ /Wx.|.xW/) {
2589 ERROR("SPACING",
2590 "spaces prohibited around that '$op' $at\n" . $hereptr);
2591 }
2592
2593 # , must have a space on the right.
2594 } elsif ($op eq ',') {
2595 if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2596 ERROR("SPACING",
2597 "space required after that '$op' $at\n" . $hereptr);
2598 }
2599
2600 # '*' as part of a type definition -- reported already.
2601 } elsif ($opv eq '*_') {
2602 #warn "'*' is part of type\n";
2603
2604 # unary operators should have a space before and
2605 # none after. May be left adjacent to another
2606 # unary operator, or a cast
2607 } elsif ($op eq '!' || $op eq '~' ||
2608 $opv eq '*U' || $opv eq '-U' ||
2609 $opv eq '&U' || $opv eq '&&U') {
2610 if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2611 ERROR("SPACING",
2612 "space required before that '$op' $at\n" . $hereptr);
2613 }
2614 if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2615 # A unary '*' may be const
2616
2617 } elsif ($ctx =~ /.xW/) {
2618 ERROR("SPACING",
2619 "space prohibited after that '$op' $at\n" . $hereptr);
2620 }
2621
2622 # unary ++ and unary -- are allowed no space on one side.
2623 } elsif ($op eq '++' or $op eq '--') {
2624 if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2625 ERROR("SPACING",
2626 "space required one side of that '$op' $at\n" . $hereptr);
2627 }
2628 if ($ctx =~ /Wx[BE]/ ||
2629 ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2630 ERROR("SPACING",
2631 "space prohibited before that '$op' $at\n" . $hereptr);
2632 }
2633 if ($ctx =~ /ExW/) {
2634 ERROR("SPACING",
2635 "space prohibited after that '$op' $at\n" . $hereptr);
2636 }
2637
2638
2639 # << and >> may either have or not have spaces both sides
2640 } elsif ($op eq '<<' or $op eq '>>' or
2641 $op eq '&' or $op eq '^' or $op eq '|' or
2642 $op eq '+' or $op eq '-' or
2643 $op eq '*' or $op eq '/' or
2644 $op eq '%')
2645 {
2646 if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2647 ERROR("SPACING",
2648 "need consistent spacing around '$op' $at\n" .
2649 $hereptr);
2650 }
2651
2652 # A colon needs no spaces before when it is
2653 # terminating a case value or a label.
2654 } elsif ($opv eq ':C' || $opv eq ':L') {
2655 if ($ctx =~ /Wx./) {
2656 ERROR("SPACING",
2657 "space prohibited before that '$op' $at\n" . $hereptr);
2658 }
2659
2660 # All the others need spaces both sides.
2661 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2662 my $ok = 0;
2663
2664 # Ignore email addresses <foo@bar>
2665 if (($op eq '<' &&
2666 $cc =~ /^\S+\@\S+>/) ||
2667 ($op eq '>' &&
2668 $ca =~ /<\S+\@\S+$/))
2669 {
2670 $ok = 1;
2671 }
2672
2673 # Ignore ?:
2674 if (($opv eq ':O' && $ca =~ /\?$/) ||
2675 ($op eq '?' && $cc =~ /^:/)) {
2676 $ok = 1;
2677 }
2678
2679 if ($ok == 0) {
2680 ERROR("SPACING",
2681 "spaces required around that '$op' $at\n" . $hereptr);
2682 }
2683 }
2684 $off += length($elements[$n + 1]);
2685 }
2686 }
2687
2688# check for multiple assignments
2689 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2690 CHK("MULTIPLE_ASSIGNMENTS",
2691 "multiple assignments should be avoided\n" . $herecurr);
2692 }
2693
2694## # check for multiple declarations, allowing for a function declaration
2695## # continuation.
2696## if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2697## $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2698##
2699## # Remove any bracketed sections to ensure we do not
2700## # falsly report the parameters of functions.
2701## my $ln = $line;
2702## while ($ln =~ s/\([^\(\)]*\)//g) {
2703## }
2704## if ($ln =~ /,/) {
2705## WARN("MULTIPLE_DECLARATION",
2706## "declaring multiple variables together should be avoided\n" . $herecurr);
2707## }
2708## }
2709
2710#need space before brace following if, while, etc
2711 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2712 $line =~ /do{/) {
2713 ERROR("SPACING",
2714 "space required before the open brace '{'\n" . $herecurr);
2715 }
2716
2717# closing brace should have a space following it when it has anything
2718# on the line
2719 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2720 ERROR("SPACING",
2721 "space required after that close brace '}'\n" . $herecurr);
2722 }
2723
2724# check spacing on square brackets
2725 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2726 ERROR("SPACING",
2727 "space prohibited after that open square bracket '['\n" . $herecurr);
2728 }
2729 if ($line =~ /\s\]/) {
2730 ERROR("SPACING",
2731 "space prohibited before that close square bracket ']'\n" . $herecurr);
2732 }
2733
2734# check spacing on parentheses
2735 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2736 $line !~ /for\s*\(\s+;/) {
2737 ERROR("SPACING",
2738 "space prohibited after that open parenthesis '('\n" . $herecurr);
2739 }
2740 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2741 $line !~ /for\s*\(.*;\s+\)/ &&
2742 $line !~ /:\s+\)/) {
2743 ERROR("SPACING",
2744 "space prohibited before that close parenthesis ')'\n" . $herecurr);
2745 }
2746
2747#goto labels aren't indented, allow a single space however
2748 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2749 !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2750 WARN("INDENTED_LABEL",
2751 "labels should not be indented\n" . $herecurr);
2752 }
2753
2754# Return is not a function.
2755 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2756 my $spacing = $1;
2757 my $value = $2;
2758
2759 # Flatten any parentheses
2760 $value =~ s/\(/ \(/g;
2761 $value =~ s/\)/\) /g;
2762 while ($value =~ s/\[[^\[\]]*\]/1/ ||
2763 $value !~ /(?:$Ident|-?$Constant)\s*
2764 $Compare\s*
2765 (?:$Ident|-?$Constant)/x &&
2766 $value =~ s/\([^\(\)]*\)/1/) {
2767 }
2768#print "value<$value>\n";
2769 if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2770 ERROR("RETURN_PARENTHESES",
2771 "return is not a function, parentheses are not required\n" . $herecurr);
2772
2773 } elsif ($spacing !~ /\s+/) {
2774 ERROR("SPACING",
2775 "space required before the open parenthesis '('\n" . $herecurr);
2776 }
2777 }
2778# Return of what appears to be an errno should normally be -'ve
2779 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2780 my $name = $1;
2781 if ($name ne 'EOF' && $name ne 'ERROR') {
2782 WARN("USE_NEGATIVE_ERRNO",
2783 "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2784 }
2785 }
2786
2787# Need a space before open parenthesis after if, while etc
2788 if ($line=~/\b(if|while|for|switch)\(/) {
2789 ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr);
2790 }
2791
2792# Check for illegal assignment in if conditional -- and check for trailing
2793# statements after the conditional.
2794 if ($line =~ /do\s*(?!{)/) {
2795 ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2796 ctx_statement_block($linenr, $realcnt, 0)
2797 if (!defined $stat);
2798 my ($stat_next) = ctx_statement_block($line_nr_next,
2799 $remain_next, $off_next);
2800 $stat_next =~ s/\n./\n /g;
2801 ##print "stat<$stat> stat_next<$stat_next>\n";
2802
2803 if ($stat_next =~ /^\s*while\b/) {
2804 # If the statement carries leading newlines,
2805 # then count those as offsets.
2806 my ($whitespace) =
2807 ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2808 my $offset =
2809 statement_rawlines($whitespace) - 1;
2810
2811 $suppress_whiletrailers{$line_nr_next +
2812 $offset} = 1;
2813 }
2814 }
2815 if (!defined $suppress_whiletrailers{$linenr} &&
2816 $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2817 my ($s, $c) = ($stat, $cond);
2818
2819 if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2820 ERROR("ASSIGN_IN_IF",
2821 "do not use assignment in if condition\n" . $herecurr);
2822 }
2823
2824 # Find out what is on the end of the line after the
2825 # conditional.
2826 substr($s, 0, length($c), '');
2827 $s =~ s/\n.*//g;
2828 $s =~ s/$;//g; # Remove any comments
2829 if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2830 $c !~ /}\s*while\s*/)
2831 {
2832 # Find out how long the conditional actually is.
2833 my @newlines = ($c =~ /\n/gs);
2834 my $cond_lines = 1 + $#newlines;
2835 my $stat_real = '';
2836
2837 $stat_real = raw_line($linenr, $cond_lines)
2838 . "\n" if ($cond_lines);
2839 if (defined($stat_real) && $cond_lines > 1) {
2840 $stat_real = "[...]\n$stat_real";
2841 }
2842
2843 ERROR("TRAILING_STATEMENTS",
2844 "trailing statements should be on next line\n" . $herecurr . $stat_real);
2845 }
2846 }
2847
2848# Check for bitwise tests written as boolean
2849 if ($line =~ /
2850 (?:
2851 (?:\[|\(|\&\&|\|\|)
2852 \s*0[xX][0-9]+\s*
2853 (?:\&\&|\|\|)
2854 |
2855 (?:\&\&|\|\|)
2856 \s*0[xX][0-9]+\s*
2857 (?:\&\&|\|\||\)|\])
2858 )/x)
2859 {
2860 WARN("HEXADECIMAL_BOOLEAN_TEST",
2861 "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2862 }
2863
2864# if and else should not have general statements after it
2865 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2866 my $s = $1;
2867 $s =~ s/$;//g; # Remove any comments
2868 if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2869 ERROR("TRAILING_STATEMENTS",
2870 "trailing statements should be on next line\n" . $herecurr);
2871 }
2872 }
2873# if should not continue a brace
2874 if ($line =~ /}\s*if\b/) {
2875 ERROR("TRAILING_STATEMENTS",
2876 "trailing statements should be on next line\n" .
2877 $herecurr);
2878 }
2879# case and default should not have general statements after them
2880 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2881 $line !~ /\G(?:
2882 (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2883 \s*return\s+
2884 )/xg)
2885 {
2886 ERROR("TRAILING_STATEMENTS",
2887 "trailing statements should be on next line\n" . $herecurr);
2888 }
2889
2890 # Check for }<nl>else {, these must be at the same
2891 # indent level to be relevant to each other.
2892 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2893 $previndent == $indent) {
2894 ERROR("ELSE_AFTER_BRACE",
2895 "else should follow close brace '}'\n" . $hereprev);
2896 }
2897
2898 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2899 $previndent == $indent) {
2900 my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2901
2902 # Find out what is on the end of the line after the
2903 # conditional.
2904 substr($s, 0, length($c), '');
2905 $s =~ s/\n.*//g;
2906
2907 if ($s =~ /^\s*;/) {
2908 ERROR("WHILE_AFTER_BRACE",
2909 "while should follow close brace '}'\n" . $hereprev);
2910 }
2911 }
2912
2913#CamelCase
2914 while ($line =~ m{($Constant|$Lval)}g) {
2915 my $var = $1;
2916 if ($var !~ /$Constant/ &&
2917 $var =~ /[A-Z]\w*[a-z]|[a-z]\w*[A-Z]/ &&
2918 !defined $camelcase{$var}) {
2919 $camelcase{$var} = 1;
2920 WARN("CAMELCASE",
2921 "Avoid CamelCase: <$var>\n" . $herecurr);
2922 }
2923 }
2924
2925#no spaces allowed after \ in define
2926 if ($line=~/\#\s*define.*\\\s$/) {
2927 WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
2928 "Whitepspace after \\ makes next lines useless\n" . $herecurr);
2929 }
2930
2931#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2932 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2933 my $file = "$1.h";
2934 my $checkfile = "include/linux/$file";
2935 if (-f "$root/$checkfile" &&
2936 $realfile ne $checkfile &&
2937 $1 !~ /$allowed_asm_includes/)
2938 {
2939 if ($realfile =~ m{^arch/}) {
2940 CHK("ARCH_INCLUDE_LINUX",
2941 "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2942 } else {
2943 WARN("INCLUDE_LINUX",
2944 "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2945 }
2946 }
2947 }
2948
2949# multi-statement macros should be enclosed in a do while loop, grab the
2950# first statement and ensure its the whole macro if its not enclosed
2951# in a known good container
2952 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2953 $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2954 my $ln = $linenr;
2955 my $cnt = $realcnt;
2956 my ($off, $dstat, $dcond, $rest);
2957 my $ctx = '';
2958 ($dstat, $dcond, $ln, $cnt, $off) =
2959 ctx_statement_block($linenr, $realcnt, 0);
2960 $ctx = $dstat;
2961 #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2962 #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2963
2964 $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
2965 $dstat =~ s/$;//g;
2966 $dstat =~ s/\\\n.//g;
2967 $dstat =~ s/^\s*//s;
2968 $dstat =~ s/\s*$//s;
2969
2970 # Flatten any parentheses and braces
2971 while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2972 $dstat =~ s/\{[^\{\}]*\}/1/ ||
2973 $dstat =~ s/\[[^\[\]]*\]/1/)
2974 {
2975 }
2976
2977 # Flatten any obvious string concatentation.
2978 while ($dstat =~ s/("X*")\s*$Ident/$1/ ||
2979 $dstat =~ s/$Ident\s*("X*")/$1/)
2980 {
2981 }
2982
2983 my $exceptions = qr{
2984 $Declare|
2985 module_param_named|
2986 MODULE_PARM_DESC|
2987 DECLARE_PER_CPU|
2988 DEFINE_PER_CPU|
2989 __typeof__\(|
2990 union|
2991 struct|
2992 \.$Ident\s*=\s*|
2993 ^\"|\"$
2994 }x;
2995 #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2996 if ($dstat ne '' &&
2997 $dstat !~ /^(?:$Ident|-?$Constant),$/ && # 10, // foo(),
2998 $dstat !~ /^(?:$Ident|-?$Constant);$/ && # foo();
2999 $dstat !~ /^[!~-]?(?:$Ident|$Constant)$/ && # 10 // foo() // !foo // ~foo // -foo
3000 $dstat !~ /^'X'$/ && # character constants
3001 $dstat !~ /$exceptions/ &&
3002 $dstat !~ /^\.$Ident\s*=/ && # .foo =
3003 $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ && # do {...} while (...); // do {...} while (...)
3004 $dstat !~ /^for\s*$Constant$/ && # for (...)
3005 $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ && # for (...) bar()
3006 $dstat !~ /^do\s*{/ && # do {...
3007 $dstat !~ /^\({/) # ({...
3008 {
3009 $ctx =~ s/\n*$//;
3010 my $herectx = $here . "\n";
3011 my $cnt = statement_rawlines($ctx);
3012
3013 for (my $n = 0; $n < $cnt; $n++) {
3014 $herectx .= raw_line($linenr, $n) . "\n";
3015 }
3016
3017 if ($dstat =~ /;/) {
3018 ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
3019 "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
3020 } else {
3021 ERROR("COMPLEX_MACRO",
3022 "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
3023 }
3024 }
3025
3026# check for line continuations outside of #defines, preprocessor #, and asm
3027
3028 } else {
3029 if ($prevline !~ /^..*\\$/ &&
3030 $line !~ /^\+\s*\#.*\\$/ && # preprocessor
3031 $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ && # asm
3032 $line =~ /^\+.*\\$/) {
3033 WARN("LINE_CONTINUATIONS",
3034 "Avoid unnecessary line continuations\n" . $herecurr);
3035 }
3036 }
3037
3038# do {} while (0) macro tests:
3039# single-statement macros do not need to be enclosed in do while (0) loop,
3040# macro should not end with a semicolon
3041 if ($^V && $^V ge 5.10.0 &&
3042 $realfile !~ m@/vmlinux.lds.h$@ &&
3043 $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
3044 my $ln = $linenr;
3045 my $cnt = $realcnt;
3046 my ($off, $dstat, $dcond, $rest);
3047 my $ctx = '';
3048 ($dstat, $dcond, $ln, $cnt, $off) =
3049 ctx_statement_block($linenr, $realcnt, 0);
3050 $ctx = $dstat;
3051
3052 $dstat =~ s/\\\n.//g;
3053
3054 if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
3055 my $stmts = $2;
3056 my $semis = $3;
3057
3058 $ctx =~ s/\n*$//;
3059 my $cnt = statement_rawlines($ctx);
3060 my $herectx = $here . "\n";
3061
3062 for (my $n = 0; $n < $cnt; $n++) {
3063 $herectx .= raw_line($linenr, $n) . "\n";
3064 }
3065
3066 if (($stmts =~ tr/;/;/) == 1 &&
3067 $stmts !~ /^\s*(if|while|for|switch)\b/) {
3068 WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
3069 "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
3070 }
3071 if (defined $semis && $semis ne "") {
3072 WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
3073 "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
3074 }
3075 }
3076 }
3077
3078# make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
3079# all assignments may have only one of the following with an assignment:
3080# .
3081# ALIGN(...)
3082# VMLINUX_SYMBOL(...)
3083 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
3084 WARN("MISSING_VMLINUX_SYMBOL",
3085 "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
3086 }
3087
3088# check for redundant bracing round if etc
3089 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
3090 my ($level, $endln, @chunks) =
3091 ctx_statement_full($linenr, $realcnt, 1);
3092 #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
3093 #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
3094 if ($#chunks > 0 && $level == 0) {
3095 my @allowed = ();
3096 my $allow = 0;
3097 my $seen = 0;
3098 my $herectx = $here . "\n";
3099 my $ln = $linenr - 1;
3100 for my $chunk (@chunks) {
3101 my ($cond, $block) = @{$chunk};
3102
3103 # If the condition carries leading newlines, then count those as offsets.
3104 my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
3105 my $offset = statement_rawlines($whitespace) - 1;
3106
3107 $allowed[$allow] = 0;
3108 #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
3109
3110 # We have looked at and allowed this specific line.
3111 $suppress_ifbraces{$ln + $offset} = 1;
3112
3113 $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
3114 $ln += statement_rawlines($block) - 1;
3115
3116 substr($block, 0, length($cond), '');
3117
3118 $seen++ if ($block =~ /^\s*{/);
3119
3120 #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
3121 if (statement_lines($cond) > 1) {
3122 #print "APW: ALLOWED: cond<$cond>\n";
3123 $allowed[$allow] = 1;
3124 }
3125 if ($block =~/\b(?:if|for|while)\b/) {
3126 #print "APW: ALLOWED: block<$block>\n";
3127 $allowed[$allow] = 1;
3128 }
3129 if (statement_block_size($block) > 1) {
3130 #print "APW: ALLOWED: lines block<$block>\n";
3131 $allowed[$allow] = 1;
3132 }
3133 $allow++;
3134 }
3135 if ($seen) {
3136 my $sum_allowed = 0;
3137 foreach (@allowed) {
3138 $sum_allowed += $_;
3139 }
3140 if ($sum_allowed == 0) {
3141 WARN("BRACES",
3142 "braces {} are not necessary for any arm of this statement\n" . $herectx);
3143 } elsif ($sum_allowed != $allow &&
3144 $seen != $allow) {
3145 CHK("BRACES",
3146 "braces {} should be used on all arms of this statement\n" . $herectx);
3147 }
3148 }
3149 }
3150 }
3151 if (!defined $suppress_ifbraces{$linenr - 1} &&
3152 $line =~ /\b(if|while|for|else)\b/) {
3153 my $allowed = 0;
3154
3155 # Check the pre-context.
3156 if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
3157 #print "APW: ALLOWED: pre<$1>\n";
3158 $allowed = 1;
3159 }
3160
3161 my ($level, $endln, @chunks) =
3162 ctx_statement_full($linenr, $realcnt, $-[0]);
3163
3164 # Check the condition.
3165 my ($cond, $block) = @{$chunks[0]};
3166 #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
3167 if (defined $cond) {
3168 substr($block, 0, length($cond), '');
3169 }
3170 if (statement_lines($cond) > 1) {
3171 #print "APW: ALLOWED: cond<$cond>\n";
3172 $allowed = 1;
3173 }
3174 if ($block =~/\b(?:if|for|while)\b/) {
3175 #print "APW: ALLOWED: block<$block>\n";
3176 $allowed = 1;
3177 }
3178 if (statement_block_size($block) > 1) {
3179 #print "APW: ALLOWED: lines block<$block>\n";
3180 $allowed = 1;
3181 }
3182 # Check the post-context.
3183 if (defined $chunks[1]) {
3184 my ($cond, $block) = @{$chunks[1]};
3185 if (defined $cond) {
3186 substr($block, 0, length($cond), '');
3187 }
3188 if ($block =~ /^\s*\{/) {
3189 #print "APW: ALLOWED: chunk-1 block<$block>\n";
3190 $allowed = 1;
3191 }
3192 }
3193 if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
3194 my $herectx = $here . "\n";
3195 my $cnt = statement_rawlines($block);
3196
3197 for (my $n = 0; $n < $cnt; $n++) {
3198 $herectx .= raw_line($linenr, $n) . "\n";
3199 }
3200
7a6dd8dd 3201 WARN("BRACES_SINGLE_STMT",
41ab1dbe
CB		 3202 "braces {} are not necessary for single statement blocks\n" . $herectx);
3203 }
3204 }
3205
3206# check for unnecessary blank lines around braces
3207 if (($line =~ /^..*}\s*$/ && $prevline =~ /^.\s*$/)) {
3208 CHK("BRACES",
3209 "Blank lines aren't necessary before a close brace '}'\n" . $hereprev);
3210 }
3211 if (($line =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
3212 CHK("BRACES",
3213 "Blank lines aren't necessary after an open brace '{'\n" . $hereprev);
3214 }
3215
3216# no volatiles please
3217 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
3218 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
3219 WARN("VOLATILE",
3220 "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
3221 }
3222
3223# warn about #if 0
3224 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
3225 CHK("REDUNDANT_CODE",
3226 "if this code is redundant consider removing it\n" .
3227 $herecurr);
3228 }
3229
3230# check for needless "if (<foo>) fn(<foo>)" uses
3231 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
3232 my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
3233 if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
3234 WARN('NEEDLESS_IF',
3235 "$1(NULL) is safe this check is probably not required\n" . $hereprev);
3236 }
3237 }
3238
3239# prefer usleep_range over udelay
3240 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
3241 # ignore udelay's < 10, however
3242 if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
3243 CHK("USLEEP_RANGE",
3244 "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
3245 }
3246 }
3247
3248# warn about unexpectedly long msleep's
3249 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
3250 if ($1 < 20) {
3251 WARN("MSLEEP",
3252 "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
3253 }
3254 }
3255
3256# warn about #ifdefs in C files
3257# if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
3258# print "#ifdef in C files should be avoided\n";
3259# print "$herecurr";
3260# $clean = 0;
3261# }
3262
3263# warn about spacing in #ifdefs
3264 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
3265 ERROR("SPACING",
3266 "exactly one space required after that #$1\n" . $herecurr);
3267 }
3268
3269# check for spinlock_t definitions without a comment.
3270 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
3271 $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
3272 my $which = $1;
3273 if (!ctx_has_comment($first_line, $linenr)) {
3274 CHK("UNCOMMENTED_DEFINITION",
3275 "$1 definition without comment\n" . $herecurr);
3276 }
3277 }
3278# check for memory barriers without a comment.
3279 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
3280 if (!ctx_has_comment($first_line, $linenr)) {
3281 CHK("MEMORY_BARRIER",
3282 "memory barrier without comment\n" . $herecurr);
3283 }
3284 }
3285# check of hardware specific defines
3286 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
3287 CHK("ARCH_DEFINES",
3288 "architecture specific defines should be avoided\n" . $herecurr);
3289 }
3290
3291# Check that the storage class is at the beginning of a declaration
3292 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
3293 WARN("STORAGE_CLASS",
3294 "storage class should be at the beginning of the declaration\n" . $herecurr)
3295 }
3296
3297# check the location of the inline attribute, that it is between
3298# storage class and type.
3299 if ($line =~ /\b$Type\s+$Inline\b/ ||
3300 $line =~ /\b$Inline\s+$Storage\b/) {
3301 ERROR("INLINE_LOCATION",
3302 "inline keyword should sit between storage class and type\n" . $herecurr);
3303 }
3304
3305# Check for __inline__ and __inline, prefer inline
3306 if ($line =~ /\b(__inline__|__inline)\b/) {
3307 WARN("INLINE",
3308 "plain inline is preferred over $1\n" . $herecurr);
3309 }
3310
3311# Check for __attribute__ packed, prefer __packed
3312 if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
3313 WARN("PREFER_PACKED",
3314 "__packed is preferred over __attribute__((packed))\n" . $herecurr);
3315 }
3316
3317# Check for __attribute__ aligned, prefer __aligned
3318 if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
3319 WARN("PREFER_ALIGNED",
3320 "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
3321 }
3322
3323# Check for __attribute__ format(printf, prefer __printf
3324 if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
3325 WARN("PREFER_PRINTF",
3326 "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
3327 }
3328
3329# Check for __attribute__ format(scanf, prefer __scanf
3330 if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
3331 WARN("PREFER_SCANF",
3332 "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr);
3333 }
3334
3335# check for sizeof(&)
3336 if ($line =~ /\bsizeof\s*\(\s*\&/) {
3337 WARN("SIZEOF_ADDRESS",
3338 "sizeof(& should be avoided\n" . $herecurr);
3339 }
3340
3341# check for sizeof without parenthesis
3342 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
3343 WARN("SIZEOF_PARENTHESIS",
3344 "sizeof $1 should be sizeof($1)\n" . $herecurr);
3345 }
3346
3347# check for line continuations in quoted strings with odd counts of "
3348 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
3349 WARN("LINE_CONTINUATIONS",
3350 "Avoid line continuations in quoted strings\n" . $herecurr);
3351 }
3352
3353# check for struct spinlock declarations
3354 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
3355 WARN("USE_SPINLOCK_T",
3356 "struct spinlock should be spinlock_t\n" . $herecurr);
3357 }
3358
3359# Check for misused memsets
3360 if ($^V && $^V ge 5.10.0 &&
3361 defined $stat &&
3362 $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
3363
3364 my $ms_addr = $2;
3365 my $ms_val = $7;
3366 my $ms_size = $12;
3367
3368 if ($ms_size =~ /^(0x|)0$/i) {
3369 ERROR("MEMSET",
3370 "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
3371 } elsif ($ms_size =~ /^(0x|)1$/i) {
3372 WARN("MEMSET",
3373 "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
3374 }
3375 }
3376
3377# typecasts on min/max could be min_t/max_t
3378 if ($^V && $^V ge 5.10.0 &&
3379 defined $stat &&
3380 $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
3381 if (defined $2 || defined $7) {
3382 my $call = $1;
3383 my $cast1 = deparenthesize($2);
3384 my $arg1 = $3;
3385 my $cast2 = deparenthesize($7);
3386 my $arg2 = $8;
3387 my $cast;
3388
3389 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
3390 $cast = "$cast1 or $cast2";
3391 } elsif ($cast1 ne "") {
3392 $cast = $cast1;
3393 } else {
3394 $cast = $cast2;
3395 }
3396 WARN("MINMAX",
3397 "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
3398 }
3399 }
3400
3401# check usleep_range arguments
3402 if ($^V && $^V ge 5.10.0 &&
3403 defined $stat &&
3404 $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
3405 my $min = $1;
3406 my $max = $7;
3407 if ($min eq $max) {
3408 WARN("USLEEP_RANGE",
3409 "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
3410 } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
3411 $min > $max) {
3412 WARN("USLEEP_RANGE",
3413 "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
3414 }
3415 }
3416
3417# check for new externs in .c files.
3418 if ($realfile =~ /\.c$/ && defined $stat &&
3419 $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
3420 {
3421 my $function_name = $1;
3422 my $paren_space = $2;
3423
3424 my $s = $stat;
3425 if (defined $cond) {
3426 substr($s, 0, length($cond), '');
3427 }
3428 if ($s =~ /^\s*;/ &&
3429 $function_name ne 'uninitialized_var')
3430 {
3431 WARN("AVOID_EXTERNS",
3432 "externs should be avoided in .c files\n" . $herecurr);
3433 }
3434
3435 if ($paren_space =~ /\n/) {
3436 WARN("FUNCTION_ARGUMENTS",
3437 "arguments for function declarations should follow identifier\n" . $herecurr);
3438 }
3439
3440 } elsif ($realfile =~ /\.c$/ && defined $stat &&
3441 $stat =~ /^.\s*extern\s+/)
3442 {
3443 WARN("AVOID_EXTERNS",
3444 "externs should be avoided in .c files\n" . $herecurr);
3445 }
3446
3447# checks for new __setup's
3448 if ($rawline =~ /\b__setup\("([^"]*)"/) {
3449 my $name = $1;
3450
3451 if (!grep(/$name/, @setup_docs)) {
3452 CHK("UNDOCUMENTED_SETUP",
3453 "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
3454 }
3455 }
3456
3457# check for pointless casting of kmalloc return
3458 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
3459 WARN("UNNECESSARY_CASTS",
3460 "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
3461 }
3462
3463# check for multiple semicolons
3464 if ($line =~ /;\s*;\s*$/) {
3465 WARN("ONE_SEMICOLON",
3466 "Statements terminations use 1 semicolon\n" . $herecurr);
3467 }
3468
3469# check for switch/default statements without a break;
3470 if ($^V && $^V ge 5.10.0 &&
3471 defined $stat &&
3472 $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
3473 my $ctx = '';
3474 my $herectx = $here . "\n";
3475 my $cnt = statement_rawlines($stat);
3476 for (my $n = 0; $n < $cnt; $n++) {
3477 $herectx .= raw_line($linenr, $n) . "\n";
3478 }
3479 WARN("DEFAULT_NO_BREAK",
3480 "switch default: should use break\n" . $herectx);
3481 }
3482
3483# check for gcc specific __FUNCTION__
3484 if ($line =~ /__FUNCTION__/) {
3485 WARN("USE_FUNC",
3486 "__func__ should be used instead of gcc specific __FUNCTION__\n" . $herecurr);
3487 }
3488
3489# check for use of yield()
3490 if ($line =~ /\byield\s*\(\s*\)/) {
3491 WARN("YIELD",
3492 "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n" . $herecurr);
3493 }
3494
3495# check for semaphores initialized locked
3496 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
3497 WARN("CONSIDER_COMPLETION",
3498 "consider using a completion\n" . $herecurr);
3499 }
3500
3501# recommend kstrto* over simple_strto* and strict_strto*
3502 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
3503 WARN("CONSIDER_KSTRTO",
3504 "$1 is obsolete, use k$3 instead\n" . $herecurr);
3505 }
3506
3507# check for __initcall(), use device_initcall() explicitly please
3508 if ($line =~ /^.\s*__initcall\s*\(/) {
3509 WARN("USE_DEVICE_INITCALL",
3510 "please use device_initcall() instead of __initcall()\n" . $herecurr);
3511 }
3512
3513# check for various ops structs, ensure they are const.
3514 my $struct_ops = qr{acpi_dock_ops|
3515 address_space_operations|
3516 backlight_ops|
3517 block_device_operations|
3518 dentry_operations|
3519 dev_pm_ops|
3520 dma_map_ops|
3521 extent_io_ops|
3522 file_lock_operations|
3523 file_operations|
3524 hv_ops|
3525 ide_dma_ops|
3526 intel_dvo_dev_ops|
3527 item_operations|
3528 iwl_ops|
3529 kgdb_arch|
3530 kgdb_io|
3531 kset_uevent_ops|
3532 lock_manager_operations|
3533 microcode_ops|
3534 mtrr_ops|
3535 neigh_ops|
3536 nlmsvc_binding|
3537 pci_raw_ops|
3538 pipe_buf_operations|
3539 platform_hibernation_ops|
3540 platform_suspend_ops|
3541 proto_ops|
3542 rpc_pipe_ops|
3543 seq_operations|
3544 snd_ac97_build_ops|
3545 soc_pcmcia_socket_ops|
3546 stacktrace_ops|
3547 sysfs_ops|
3548 tty_operations|
3549 usb_mon_operations|
3550 wd_ops}x;
3551 if ($line !~ /\bconst\b/ &&
3552 $line =~ /\bstruct\s+($struct_ops)\b/) {
3553 WARN("CONST_STRUCT",
3554 "struct $1 should normally be const\n" .
3555 $herecurr);
3556 }
3557
3558# use of NR_CPUS is usually wrong
3559# ignore definitions of NR_CPUS and usage to define arrays as likely right
3560 if ($line =~ /\bNR_CPUS\b/ &&
3561 $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
3562 $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
3563 $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
3564 $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
3565 $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
3566 {
3567 WARN("NR_CPUS",
3568 "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
3569 }
3570
3571# check for %L{u,d,i} in strings
3572 my $string;
3573 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
3574 $string = substr($rawline, $-[1], $+[1] - $-[1]);
3575 $string =~ s/%%/__/g;
3576 if ($string =~ /(?<!%)%L[udi]/) {
3577 WARN("PRINTF_L",
3578 "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
3579 last;
3580 }
3581 }
3582
3583# whine mightly about in_atomic
3584 if ($line =~ /\bin_atomic\s*\(/) {
3585 if ($realfile =~ m@^drivers/@) {
3586 ERROR("IN_ATOMIC",
3587 "do not use in_atomic in drivers\n" . $herecurr);
3588 } elsif ($realfile !~ m@^kernel/@) {
3589 WARN("IN_ATOMIC",
3590 "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
3591 }
3592 }
3593
3594# check for lockdep_set_novalidate_class
3595 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
3596 $line =~ /__lockdep_no_validate__\s*\)/ ) {
3597 if ($realfile !~ m@^kernel/lockdep@ &&
3598 $realfile !~ m@^include/linux/lockdep@ &&
3599 $realfile !~ m@^drivers/base/core@) {
3600 ERROR("LOCKDEP",
3601 "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
3602 }
3603 }
3604
3605 if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
3606 $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
3607 WARN("EXPORTED_WORLD_WRITABLE",
3608 "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
3609 }
3610 }
3611
3612 # If we have no input at all, then there is nothing to report on
3613 # so just keep quiet.
3614 if ($#rawlines == -1) {
3615 exit(0);
3616 }
3617
3618 # In mailback mode only produce a report in the negative, for
3619 # things that appear to be patches.
3620 if ($mailback && ($clean == 1 || !$is_patch)) {
3621 exit(0);
3622 }
3623
3624 # This is not a patch, and we are are in 'no-patch' mode so
3625 # just keep quiet.
3626 if (!$chk_patch && !$is_patch) {
3627 exit(0);
3628 }
3629
3630 if (!$is_patch) {
3631 ERROR("NOT_UNIFIED_DIFF",
3632 "Does not appear to be a unified-diff format patch\n");
3633 }
3634 if ($is_patch && $chk_signoff && $signoff == 0) {
3635 ERROR("MISSING_SIGN_OFF",
3636 "Missing Signed-off-by: line(s)\n");
3637 }
3638
3639 print report_dump();
3640 if ($summary && !($clean == 1 && $quiet == 1)) {
3641 print "$filename " if ($summary_file);
3642 print "total: $cnt_error errors, $cnt_warn warnings, " .
3643 (($check)? "$cnt_chk checks, " : "") .
3644 "$cnt_lines lines checked\n";
3645 print "\n" if ($quiet == 0);
3646 }
3647
3648 if ($quiet == 0) {
3649
3650 if ($^V lt 5.10.0) {
3651 print("NOTE: perl $^V is not modern enough to detect all possible issues.\n");
3652 print("An upgrade to at least perl v5.10.0 is suggested.\n\n");
3653 }
3654
3655 # If there were whitespace errors which cleanpatch can fix
3656 # then suggest that.
3657 if ($rpt_cleaners) {
3658 print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
3659 print " scripts/cleanfile\n\n";
3660 $rpt_cleaners = 0;
3661 }
3662 }
3663
3664 if ($quiet == 0 && keys %ignore_type) {
3665 print "NOTE: Ignored message types:";
3666 foreach my $ignore (sort keys %ignore_type) {
3667 print " $ignore";
3668 }
3669 print "\n\n";
3670 }
3671
3672 if ($clean == 1 && $quiet == 0) {
3673 print "$vname has no obvious style problems and is ready for submission.\n"
3674 }
3675 if ($clean == 0 && $quiet == 0) {
3676 print << "EOM";
3677$vname has style problems, please review.
3678
3679If any of these errors are false positives, please report
3680them to the maintainer, see CHECKPATCH in MAINTAINERS.
3681EOM
3682 }
3683
3684 return $clean;
3685}
LTTng tools - Deliverables
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