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checkpatch: add fix and improve warning msg for non-standard signature 

Currently checkpatch warns for BAD_SIGN_OFF on non-standard signature
styles.

A large number of these warnings occur because of typo mistakes in
signature tags.  An evaluation over v4.13..v5.8 showed that out of 539
warnings due to non-standard signatures, 87 are due to typo mistakes.

Following are the standard signature tags which are often incorrectly
used, along with their individual counts of incorrect use (over
v4.13..v5.8):

 Reviewed-by: 42
 Signed-off-by: 25
 Reported-by: 6
 Acked-by: 4
 Tested-by: 4
 Suggested-by: 4

Provide a fix by calculating levenshtein distance for the signature tag
with all the standard signatures and suggest a fix with a signature, whose
edit distance is less than or equal to 2 with the misspelled signature.

Out of the 86 mispelled signatures fixed with this approach, 85 were found
to be good corrections and 1 was bad correction.

Following was found to be a bad correction:
 Tweeted-by (count: 1) => Tested-by

Link: https://lkml.kernel.org/r/20201128204333.7054-1-yashsri421@gmail.com
Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
Acked-by: Joe Perches <joe@perches.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aditya Srivastava 2020-12-15 20:45:12 -08:00 committed by Linus Torvalds
parent 8e08f0765f
commit 831242ab8d
1 changed files with 69 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
scripts/checkpatch.pl
View File

@ -506,6 +506,64 @@ our $signature_tags = qr{(?xi:
Cc:
)};
sub edit_distance_min {
my (@arr) = @_;
my $len = scalar @arr;
if ((scalar @arr) < 1) {
# if underflow, return
return;
}
my $min = $arr[0];
for my $i (0 .. ($len-1)) {
if ($arr[$i] < $min) {
$min = $arr[$i];
}
}
return $min;
}
sub get_edit_distance {
my ($str1, $str2) = @_;
$str1 = lc($str1);
$str2 = lc($str2);
$str1 =~ s/-//g;
$str2 =~ s/-//g;
my $len1 = length($str1);
my $len2 = length($str2);
# two dimensional array storing minimum edit distance
my @distance;
for my $i (0 .. $len1) {
for my $j (0 .. $len2) {
if ($i == 0) {
$distance[$i][$j] = $j;
} elsif ($j == 0) {
$distance[$i][$j] = $i;
} elsif (substr($str1, $i-1, 1) eq substr($str2, $j-1, 1)) {
$distance[$i][$j] = $distance[$i - 1][$j - 1];
} else {
my $dist1 = $distance[$i][$j - 1]; #insert distance
my $dist2 = $distance[$i - 1][$j]; # remove
my $dist3 = $distance[$i - 1][$j - 1]; #replace
$distance[$i][$j] = 1 + edit_distance_min($dist1, $dist2, $dist3);
}
}
}
return $distance[$len1][$len2];
}
sub find_standard_signature {
my ($sign_off) = @_;
my @standard_signature_tags = (
'Signed-off-by:', 'Co-developed-by:', 'Acked-by:', 'Tested-by:',
'Reviewed-by:', 'Reported-by:', 'Suggested-by:'
);
foreach my $signature (@standard_signature_tags) {
return $signature if (get_edit_distance($sign_off, $signature) <= 2);
}
return "";
}
our @typeListMisordered = (
qr{char\s+(?:un)?signed},
qr{int\s+(?:(?:un)?signed\s+)?short\s},
@ -2773,8 +2831,17 @@ sub process {
my $ucfirst_sign_off = ucfirst(lc($sign_off));
if ($sign_off !~ /$signature_tags/) {
WARN("BAD_SIGN_OFF",
"Non-standard signature: $sign_off\n" . $herecurr);
my $suggested_signature = find_standard_signature($sign_off);
if ($suggested_signature eq "") {
WARN("BAD_SIGN_OFF",
"Non-standard signature: $sign_off\n" . $herecurr);
} else {
if (WARN("BAD_SIGN_OFF",
"Non-standard signature: '$sign_off' - perhaps '$suggested_signature'?\n" . $herecurr) &&
$fix) {
$fixed[$fixlinenr] =~ s/$sign_off/$suggested_signature/;
}
}
}
if (defined $space_before && $space_before ne "") {
if (WARN("BAD_SIGN_OFF",