linux-kernel - [tip:sched/urgent] sched: Fix task

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Message-ID: <tip-e6c8fba7771563b2f3dfb96a78f36ec17e15bdf0@git.kernel.org>
Date:	Wed, 16 Dec 2009 18:37:06 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/urgent] sched: Fix task_hot() test order

Commit-ID:  e6c8fba7771563b2f3dfb96a78f36ec17e15bdf0
Gitweb:     http://git.kernel.org/tip/e6c8fba7771563b2f3dfb96a78f36ec17e15bdf0
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 16 Dec 2009 18:04:33 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 16 Dec 2009 19:01:54 +0100

sched: Fix task_hot() test order

Make sure not to access sched_fair fields before verifying it is
indeed a sched_fair task.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
CC: stable@...nel.org
LKML-Reference: <20091216170517.577998058@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 9c30858..1d8ca25 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2046,6 +2046,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 {
 	s64 delta;
 
+	if (p->sched_class != &fair_sched_class)
+		return 0;
+
 	/*
 	 * Buddy candidates are cache hot:
 	 */
@@ -2054,9 +2057,6 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 			 &p->se == cfs_rq_of(&p->se)->last))
 		return 1;
 
-	if (p->sched_class != &fair_sched_class)
-		return 0;
-
 	if (sysctl_sched_migration_cost == -1)
 		return 1;
 	if (sysctl_sched_migration_cost == 0)
--
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