sched: avoid stack var in move_task_off_dead_cpu, fix

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Impact: locking fix

We can't call cpuset_cpus_allowed_locked() with the rq lock held.
However, the rq lock merely protects us from (1) cpu_online_mask changing
and (2) someone else changing p->cpus_allowed.

The first can't happen because we're being called from a cpu hotplug
notifier.  The second doesn't really matter: we are forcing the task off
a CPU it was affine to, so we're not doing very well anyway.

So we remove the rq lock from this path, and all is good.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Rusty Russell 2008-11-25 09:59:20 +10:30 • committed by Ingo Molnar

parent 3d8cbdf865

commit 1224e376f2

1 changed files with 0 additions and 4 deletions

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kernel/sched.c

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