checkpatch: prefer usleep_range over udelay

[deliverable/linux.git] / scripts / checkpatch.pl

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2018f4349b477ba3eac5d370c1efd5d99c39a1df..8b69af8a76f90acfe2cc2bdf556950c468b97ef3 100755 (executable)
--- 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";