tree 1134d7ccda13c09cf426af0524c13633292eac5b
parent cc94abfcbc9fed0048365ce1fb8dc81353408bf8
author Kirill Korotaev <dev@sw.ru> 1151402072 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1151454764 -0700

[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>