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| author | Patrick Pannuto <ppannuto@codeaurora.org> | 2010-08-09 17:21:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-09 20:45:09 -0700 |
| commit | 1a15a250862fda3fbdf8454cc7131e24de904e7c (patch) | |
| tree | 23fab33bd014d426750ca486d0be7cf59d65eb31 /scripts/checkpatch.pl | |
| parent | 8bbea968f9022c3f66a36902509574597611be99 (diff) | |
| download | lwn-1a15a250862fda3fbdf8454cc7131e24de904e7c.tar.gz lwn-1a15a250862fda3fbdf8454cc7131e24de904e7c.zip | |
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
[akpm@linux-foundation.org: fix mismatched parentheses]
Signed-off-by: Patrick Pannuto <ppannuto@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/checkpatch.pl')
| -rwxr-xr-x | scripts/checkpatch.pl | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 2018f4349b47..8b69af8a76f9 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2584,6 +2584,14 @@ sub process { } } +# 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"; |