From: Kirill Korotaev <dev@sw.ru>
Date: Tue, 27 Jun 2006 09:54:32 +0000 (-0700)
Subject: [PATCH] sched: CPU hotplug race vs. set_cpus_allowed()
X-Git-Tag: v2.6.18-rc1~512
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=efc30814a88bdbe2bfe4ac94de2eb089ad80bee3;p=pandora-kernel.git

[PATCH] sched: CPU hotplug race vs. set_cpus_allowed()

There is a race between set_cpus_allowed() and move_task_off_dead_cpu().
__migrate_task() doesn't report any err code, so task can be left on its
runqueue if its cpus_allowed mask changed so that dest_cpu is not longer a
possible target.  Also, chaning cpus_allowed mask requires rq->lock being
held.

Signed-off-by: Kirill Korotaev <dev@openvz.org>
Acked-By: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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