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authorDmitry Adamushko <dmitry.adamushko@gmail.com>2008-07-10 00:32:40 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-10 09:35:34 +0200
commitdc7fab8b3bb388c57c6c4a43ba68c8a32ca25204 (patch)
tree4f96ecc3625b3af71d00592f0e47841b8ab849a7 /init/do_mounts_rd.c
parent619b0488038224391e64fa03854651ca0f5efe56 (diff)
sched: fix cpu hotplug
I think we may have a race between try_to_wake_up() and migrate_live_tasks() -> move_task_off_dead_cpu() when the later one may end up looping endlessly. Interrupts are enabled on other CPUs when migration_call(CPU_DEAD, ...) is called so we may get a race between try_to_wake_up() and migrate_live_tasks() -> move_task_off_dead_cpu(). The former one may push a task out of a dead CPU causing the later one to loop endlessly. Heiko Carstens observed: | That's exactly what explains a dump I got yesterday. Thanks for fixing! :) Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Cc: miaox@cn.fujitsu.com Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Avi Kivity <avi@qumranet.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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