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sched: Ensure the migration task doesn't go away during use

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Like sched_migrate_task(), set_cpus_allowed_ptr() should hold
onto the migration thread too.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-07-21 13:56:38 +02:00 committed by Ingo Molnar
parent 8f48894fcc
commit 693525e3be
1 changed files with 4 additions and 0 deletions
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4
kernel/sched.c
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@ -7078,8 +7078,12 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
if (migrate_task(p, cpumask_any_and(cpu_online_mask, new_mask), &req)) { if (migrate_task(p, cpumask_any_and(cpu_online_mask, new_mask), &req)) {
/* Need help from migration thread: drop lock and wait. */ /* Need help from migration thread: drop lock and wait. */
struct task_struct *mt = rq->migration_thread;
get_task_struct(mt);
task_rq_unlock(rq, &flags); task_rq_unlock(rq, &flags);
wake_up_process(rq->migration_thread); wake_up_process(rq->migration_thread);
put_task_struct(mt);
wait_for_completion(&req.done); wait_for_completion(&req.done);
tlb_migrate_finish(p->mm); tlb_migrate_finish(p->mm);
return 0; return 0;