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authorJoe Perches <joe@perches.com>2014-01-23 15:54:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:57 -0800
commitc34c09a8451fac8555cbf0e8df1f6cf31cf1360b (patch)
treec02d5fc86654daa828f610a3d212f899ae6dee7d /scripts
parent7e4915e78992ebd3cc031051dc23063bbf29e749 (diff)
checkpatch: attempt to find missing switch/case break;
switch case statements missing a break statement are an unfortunately common error. e.g.: commit 4a2c94c9b6c0 ("HID: kye: Add report fixup for Genius Manticore Keyboard") case blocks should end in a break/return/goto/continue. If a fall-through is used, it should have a comment showing that it is intentional. Ideally that comment should be something like: "/* fall-through */" Add a test to look for missing break statements. This looks only at the context lines before an inserted case so it's possible to have false positives when the context contains a close brace and the break is before the brace and not part of the patch context. Looking at recent patches, this is a pretty rare occurrence. The normal kernel style uses a break as the last line of the previous block. Signed-off-by: Joe Perches <joe@perche.com> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl25
1 files changed, 25 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9bb4a421a8d0..260b324b6c31 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4128,6 +4128,31 @@ sub process {
}
}
+# check for case / default statements not preceeded by break/fallthrough/switch
+ if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
+ my $has_break = 0;
+ my $has_statement = 0;
+ my $count = 0;
+ my $prevline = $linenr;
+ while ($prevline > 1 && $count < 3 && !$has_break) {
+ $prevline--;
+ my $rline = $rawlines[$prevline - 1];
+ my $fline = $lines[$prevline - 1];
+ last if ($fline =~ /^\@\@/);
+ next if ($fline =~ /^\-/);
+ next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
+ $has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
+ next if ($fline =~ /^.[\s$;]*$/);
+ $has_statement = 1;
+ $count++;
+ $has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|return\b|goto\b|continue\b)/);
+ }
+ if (!$has_break && $has_statement) {
+ WARN("MISSING_BREAK",
+ "Possible switch case/default not preceeded by break or fallthrough comment\n" . $herecurr);
+ }
+ }
+
# check for switch/default statements without a break;
if ($^V && $^V ge 5.10.0 &&
defined $stat &&

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