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checkpatch: add test for repeated words

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Try to avoid adding repeated words either on the same line or consecutive
comment lines in a block

e.g.:

duplicated word in comment block

	/*
	 * this is a comment block where the last word of the previous
	 * previous line is also the first word of the next line
	 */

and simple duplication

	/* test this this again */

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/cda9b566ad67976e1acd62b053de50ee44a57250.camel@perches.com
Inspired-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2020-08-11 18:35:16 -07:00 committed by Linus Torvalds
parent ced69da1db
commit 1a3dcf2e6b
1 changed files with 38 additions and 0 deletions
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38
scripts/checkpatch.pl
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@ -588,6 +588,8 @@ our @mode_permission_funcs = (
["__ATTR", 2],
);
my $word_pattern = '\b[A-Z]?[a-z]{2,}\b';
#Create a search pattern for all these functions to speed up a loop below
our $mode_perms_search = "";
foreach my $entry (@mode_permission_funcs) {
@ -3312,6 +3314,42 @@ sub process {
}
}
# check for repeated words separated by a single space
if ($rawline =~ /^\+/) {
while ($rawline =~ /\b($word_pattern) (?=($word_pattern))/g) {
my $first = $1;
my $second = $2;
if ($first =~ /(?:struct|union|enum)/) {
pos($rawline) += length($first) + length($second) + 1;
next;
}
next if ($first ne $second);
next if ($first eq 'long');
if (WARN("REPEATED_WORD",
"Possible repeated word: '$first'\n" . $herecurr) &&
$fix) {
$fixed[$fixlinenr] =~ s/\b$first $second\b/$first/;
}
}
# if it's a repeated word on consecutive lines in a comment block
if ($prevline =~ /$;+\s*$/ &&
$prevrawline =~ /($word_pattern)\s*$/) {
my $last_word = $1;
if ($rawline =~ /^\+\s*\*\s*$last_word /) {
if (WARN("REPEATED_WORD",
"Possible repeated word: '$last_word'\n" . $hereprev) &&
$fix) {
$fixed[$fixlinenr] =~ s/(\+\s*\*\s*)$last_word /$1/;
}
}
}
}
# check for space before tabs.
if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
my $herevet = "$here\n" . cat_vet($rawline) . "\n";