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checkpatch: prefer fallthrough; over fallthrough comments

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commit 294f69e662 ("compiler_attributes.h: Add 'fallthrough' pseudo
keyword for switch/case use") added the pseudo keyword so add a test for
it to checkpatch.

Warn on a patch or use --strict for files.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/8b6c1b9031ab9f3cdebada06b8d46467f1492d68.camel@perches.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2020-04-06 20:10:58 -07:00 committed by Linus Torvalds
parent a8972573eb
commit f36d3eb89a
1 changed files with 36 additions and 0 deletions
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36
scripts/checkpatch.pl
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@ -2294,6 +2294,19 @@ sub pos_last_openparen {
return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
}
sub get_raw_comment {
my ($line, $rawline) = @_;
my $comment = '';
for my $i (0 .. (length($line) - 1)) {
if (substr($line, $i, 1) eq "$;") {
$comment .= substr($rawline, $i, 1);
}
}
return $comment;
}
sub process {
my $filename = shift;
@ -2455,6 +2468,7 @@ sub process {
$sline =~ s/$;/ /g; #with comments as spaces
my $rawline = $rawlines[$linenr - 1];
my $raw_comment = get_raw_comment($line, $rawline);
# check if it's a mode change, rename or start of a patch
if (!$in_commit_log &&
@ -6408,6 +6422,28 @@ sub process {
}
}
# check for /* fallthrough */ like comment, prefer fallthrough;
my @fallthroughs = (
'fallthrough',
'@fallthrough@',
'lint -fallthrough[ \t]*',
'intentional(?:ly)?[ \t]*fall(?:(?:s | |-)[Tt]|t)hr(?:ough|u|ew)',
'(?:else,?\s*)?FALL(?:S | |-)?THR(?:OUGH|U|EW)[ \t.!]*(?:-[^\n\r]*)?',
'Fall(?:(?:s | |-)[Tt]|t)hr(?:ough|u|ew)[ \t.!]*(?:-[^\n\r]*)?',
'fall(?:s | |-)?thr(?:ough|u|ew)[ \t.!]*(?:-[^\n\r]*)?',
);
if ($raw_comment ne '') {
foreach my $ft (@fallthroughs) {
if ($raw_comment =~ /$ft/) {
my $msg_level = \&WARN;
$msg_level = \&CHK if ($file);
&{$msg_level}("PREFER_FALLTHROUGH",
"Prefer 'fallthrough;' over fallthrough comment\n" . $herecurr);
last;
}
}
}
# check for switch/default statements without a break;
if ($perl_version_ok &&
defined $stat &&