linux-kernel - [PATCH] sched: Fix hotplug

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Date:	Sun, 20 Dec 2009 17:36:27 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Sachin Sant <sachinp@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH] sched: Fix hotplug

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.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 720df10..0ac4fa5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2348,7 +2348,7 @@ 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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