linux-kernel - [tip:sched/urgent] sched: Fix hotplug hang

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Date:	Sun, 20 Dec 2009 22:33:36 GMT
From:	tip-bot for Peter Zijlstra <peterz@...radead.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, peterz@...radead.org, sachinp@...ibm.com,
	jens.axboe@...cle.com, benh@...nel.crashing.org,
	heiko.carstens@...ibm.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/urgent] sched: Fix hotplug hang

Commit-ID:  70f1120527797adb31c68bdc6f1b45e182c342c7
Gitweb:     http://git.kernel.org/tip/70f1120527797adb31c68bdc6f1b45e182c342c7
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Sun, 20 Dec 2009 17:36:27 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 20 Dec 2009 23:31:23 +0100

sched: Fix hotplug hang

The hot-unplug kstopmachine usage does a wakeup after
deactivating the cpu, hence we cannot use cpu_active()
here but must rely on the good olde online.

Reported-by: Sachin Sant <sachinp@...ibm.com>
Reported-by: Jens Axboe <jens.axboe@...cle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Tested-by: Jens Axboe <jens.axboe@...cle.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
LKML-Reference: <1261326987.4314.24.camel@...top>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 7ffde2a..87f1f47 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2346,7 +2346,7 @@ int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)
 	 *   not worry about this generic constraint ]
 	 */
 	if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed) ||
-		     !cpu_active(cpu)))
+		     !cpu_online(cpu)))
 		cpu = select_fallback_rq(task_cpu(p), p);
 
 	return cpu;
--
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