Commit-ID: 693525e3bea25cf2ee6cf2b862ba7c148e891df2
Gitweb: http://git.kernel.org/tip/693525e3bea25cf2ee6cf2b862ba7c148e891df2
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Tue, 21 Jul 2009 13:56:38 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sun, 2 Aug 2009 14:26:15 +0200
sched: Ensure the migration task doesn't go away during use
Like sched_migrate_task(), set_cpus_allowed_ptr() should hold
onto the migration thread too.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/sched.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 475138c..7f83be3 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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)) {
/* 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);
wake_up_process(rq->migration_thread);
+ put_task_struct(mt);
wait_for_completion(&req.done);
tlb_migrate_finish(p->mm);
return 0;
--
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