linux-kernel - [PATCH] dm bufio: fix time comparison

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Message-ID: <20150106134415.GA15873@ubuntu>
Date:	Tue, 6 Jan 2015 15:44:15 +0200
From:	Asaf Vertz <asaf.vertz@...demg.com>
To:	agk@...hat.com
Cc:	snitzer@...hat.com, dm-devel@...hat.com, neilb@...e.de,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dm bufio: fix time comparison

To be future-proof and for better readability the time comparison
modified to use time_after_eq() instead of plain, error-prone math.

Signed-off-by: Asaf Vertz <asaf.vertz@...demg.com>
---
 drivers/md/dm-bufio.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index c33b497..86dbbc7 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -11,6 +11,7 @@
 #include <linux/device-mapper.h>
 #include <linux/dm-io.h>
 #include <linux/slab.h>
+#include <linux/jiffies.h>
 #include <linux/vmalloc.h>
 #include <linux/shrinker.h>
 #include <linux/module.h>
@@ -1739,7 +1740,7 @@ static unsigned get_max_age_hz(void)
 
 static bool older_than(struct dm_buffer *b, unsigned long age_hz)
 {
-	return (jiffies - b->last_accessed) >= age_hz;
+	return time_after_eq(jiffies, b->last_accessed + age_hz);
 }
 
 static void __evict_old_buffers(struct dm_bufio_client *c, unsigned long age_hz)
-- 
1.7.0.4

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