checkpatch: warn about unexpectedly long msleep's

09ef8725 · Patrick Pannuto <[email protected]> · 2010-08-09 17:21:02 -07:00

As explained in Documentation/timers/timers-howto.txt, msleep's of < 20ms
may sleep for as long as 20ms.  Caller's of msleep(1) or msleep(2), etc
are likely not to expect this quirky behavior - warn them.

Signed-off-by: Patrick Pannuto <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 09ef87255da0e005dd0ab39ca25714208cf29cb3
Parents: 1a15a250

Changes

1 files changed · +7 −0

File	Status	Add	Del	Content
scripts/checkpatch.pl	modified	+7	−0	View file

scripts/checkpatch.pl

View file

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 8b69af8..dd11bbe 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2592,6 +2592,13 @@ sub process {
 			}
 		}
 
+# warn about unexpectedly long msleep's
+		if ($line =~ /\bmsleep\s*\((\d+)\);/) {
+			if ($1 < 20) {
+				WARN("msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
+			}
+		}
+
 # warn about #ifdefs in C files
 #		if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
 #			print "#ifdef in C files should be avoided\n";