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authorJoe Perches <joe@perches.com>2020-10-16 06:11:56 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 21:11:20 +0300
commit40873aba2c6b96c6f21265e6508eaa3de145e30a (patch)
tree8ac50b404a973ac9ff05589b6db515992c5cdb57 /scripts/checkpatch.pl
parent310cd06ba2496002481eb7fd3b02c51d115aa115 (diff)
downloadlinux-40873aba2c6b96c6f21265e6508eaa3de145e30a.tar.xz
checkpatch: add test for comma use that should be semicolon
There are commas used as statement terminations that should typically have used semicolons instead. Only direct assignments or use of a single function or value on a single line are detected by this test. e.g.: foo = bar(), /* typical use is semicolon not comma */ bar = baz(); Add an imperfect test to detect these comma uses. No false positives were found in testing, but many types of false negatives are possible. e.g.: foo = bar() + 1, /* comma use, but not direct assignment */ bar = baz(); Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Link: https://lkml.kernel.org/r/3bf27caf462007dfa75647b040ab3191374a59de.camel@perches.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/checkpatch.pl')
-rwxr-xr-xscripts/checkpatch.pl11
1 files changed, 11 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 268028e382b5..74ccd122fc07 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4940,6 +4940,17 @@ sub process {
}
}
+# check if a statement with a comma should be two statements like:
+# foo = bar(), /* comma should be semicolon */
+# bar = baz();
+ if (defined($stat) &&
+ $stat =~ /^\+\s*(?:$Lval\s*$Assignment\s*)?$FuncArg\s*,\s*(?:$Lval\s*$Assignment\s*)?$FuncArg\s*;\s*$/) {
+ my $cnt = statement_rawlines($stat);
+ my $herectx = get_stat_here($linenr, $cnt, $here);
+ WARN("SUSPECT_COMMA_SEMICOLON",
+ "Possible comma where semicolon could be used\n" . $herectx);
+ }
+
# return is not a function
if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
my $spacing = $1;