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-rwxr-xr-xscripts/checkpatch.pl8
1 files changed, 8 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2018f4349b4..8b69af8a76f 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";