linux-kernel - [PATCH] timer: Fix jiffies wrap behavior of round

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Date:	Tue, 21 May 2013 20:43:50 +0200
From:	Bart Van Assche <bart.vanassche@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] timer: Fix jiffies wrap behavior of round_jiffies*()

Make sure that the round_jiffies*() functions return a time that is
in the future when the jiffies counter is about to wrap.

Signed-off-by: Bart Van Assche <bvanassche@....org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Arjan van de Ven <arjan@...radead.org>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
---
 kernel/timer.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/timer.c b/kernel/timer.c
index 15ffdb3..aa8b964 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -149,9 +149,7 @@ static unsigned long round_jiffies_common(unsigned long j, int cpu,
 	/* now that we have rounded, subtract the extra skew again */
 	j -= cpu * 3;
-	if (j <= jiffies) /* rounding ate our timeout entirely; */
-		return original;
-	return j;
+	return time_is_after_jiffies(j) ? j : original;
 }
  /**
-- 
1.7.10.4

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