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author | Dmitry Adamushko <dmitry.adamushko@gmail.com> | 2008-07-10 00:32:40 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-10 09:35:34 +0200 |
commit | dc7fab8b3bb388c57c6c4a43ba68c8a32ca25204 (patch) | |
tree | 4f96ecc3625b3af71d00592f0e47841b8ab849a7 /init/do_mounts_rd.c | |
parent | 619b0488038224391e64fa03854651ca0f5efe56 (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>
Diffstat (limited to 'init/do_mounts_rd.c')
0 files changed, 0 insertions, 0 deletions