checkpatch: prefer usleep_range over udelay
When possible, sleeping is (usually) better than delaying; however, don't
bother callers of udelay < 10us, as those cases are generally not worth
the switch to usleep
[[email protected]: fix mismatched parentheses]
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]>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2018f43..8b69af8 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2584,6 +2584,14 @@
}
}
+# prefer usleep_range over udelay
+ if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
+ # ignore udelay's < 10, however
+ if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
+ CHK("usleep_range is preferred over udelay; 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";
