linux-kernel - [tip:sched/core] sched/fair: Use time_after() in record

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Message-ID: <tip-2538d960d0c74cdc639f05723e04a67aed1efdf9@git.kernel.org>
Date:	Thu, 5 Jun 2014 07:34:46 -0700
From:	"tip-bot for Manuel Schölling" 
	<tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	tglx@...utronix.de, manuel.schoelling@....de
Subject: [tip:sched/core] sched/fair: Use time_after() in record_wakee()

Commit-ID:  2538d960d0c74cdc639f05723e04a67aed1efdf9
Gitweb:     http://git.kernel.org/tip/2538d960d0c74cdc639f05723e04a67aed1efdf9
Author:     Manuel Schölling <manuel.schoelling@....de>
AuthorDate: Thu, 22 May 2014 19:45:23 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 5 Jun 2014 11:52:02 +0200

sched/fair: Use time_after() in record_wakee()

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

Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1400780723-24626-1-git-send-email-manuel.schoelling@gmx.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7a0c000..c63dde9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4066,7 +4066,7 @@ static void record_wakee(struct task_struct *p)
 	 * about the boundary, really active task won't care
 	 * about the loss.
 	 */
-	if (jiffies > current->wakee_flip_decay_ts + HZ) {
+	if (time_after(jiffies, current->wakee_flip_decay_ts + HZ)) {
 		current->wakee_flips >>= 1;
 		current->wakee_flip_decay_ts = jiffies;
 	}
--
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