checkpatch: warn on comparisons to jiffies
Comparing jiffies is almost always wrong and time_before and time_after
should be used instead.
Warn on any comparison to jiffies.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 576139a..c274e1d 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3299,6 +3299,12 @@
}
}
+# check for comparisons of jiffies
+ if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
+ WARN("JIFFIES_COMPARISON",
+ "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
+ }
+
# warn about #ifdefs in C files
# if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
# print "#ifdef in C files should be avoided\n";