checkpatch: warn on comparisons to get_jiffies_64()

Comparing get_jiffies_64() is almost always wrong and time_before64 and
time_after64 should be used instead.

Warn on any comparison to get_jiffies_64().

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c274e1dc1e67d5ae0b933be1fa5f80233e1608ce..f4e247b277dec37ccc40a04fc3856049d0ece693 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3305,6 +3305,12 @@ sub process {
                             "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
                }
 
+# check for comparisons of get_jiffies_64()
+               if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
+                       WARN("JIFFIES_COMPARISON",
+                            "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
+               }
+
 # warn about #ifdefs in C files
 #              if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
 #                      print "#ifdef in C files should be avoided\n";