linux-kernel - [PATCH 05/12] checkpatch: Warn on comparisons to get_jiffies

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Message-Id: <a1bb8b6047d974a13d8d9b98bdfc3e3ae47c59ee.1370902448.git.joe@perches.com>
Date:	Mon, 10 Jun 2013 15:20:43 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 05/12] 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@...ches.com>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c274e1d..f4e247b2 100755
--- 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";
-- 
1.8.1.2.459.gbcd45b4.dirty

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