From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 30 Mar 2010 16:58:29 +0000 (+0200)
Subject: sched: set_cpus_allowed_ptr(): Don't use rq->migration_thread after unlock
X-Git-Tag: firefly_0821_release~10186^2~963
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=20b622cd1f1a7f557f1587524c75e72f10d8193e;p=firefly-linux-kernel-4.4.55.git

sched: set_cpus_allowed_ptr(): Don't use rq->migration_thread after unlock

commit 47a70985e5c093ae03d8ccf633c70a93761d86f2 upstream

Trivial typo fix. rq->migration_thread can be NULL after
task_rq_unlock(), this is why we have "mt" which should be
 used instead.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100330165829.GA18284@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index c02db4b77d9f..92cf8db23767 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7273,7 +7273,7 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
 
 		get_task_struct(mt);
 		task_rq_unlock(rq, &flags);
-		wake_up_process(rq->migration_thread);
+		wake_up_process(mt);
 		put_task_struct(mt);
 		wait_for_completion(&req.done);
 		tlb_migrate_finish(p->mm);