From: "Rafael J. Wysocki" <rjw@sisk.pl>

migration_thread should not be freezable, or it will break hibernation and
suspend on SMP.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/sched.c |    3 ---
 1 file changed, 3 deletions(-)

diff -puN kernel/sched.c~freezer-make-kernel-threads-nonfreezable-by-default-fix-2 kernel/sched.c
--- a/kernel/sched.c~freezer-make-kernel-threads-nonfreezable-by-default-fix-2
+++ a/kernel/sched.c
@@ -4620,13 +4620,10 @@ static int migration_thread(void *data)
 	BUG_ON(rq->migration_thread != current);
 
 	set_current_state(TASK_INTERRUPTIBLE);
-	set_freezable();
 	while (!kthread_should_stop()) {
 		struct migration_req *req;
 		struct list_head *head;
 
-		try_to_freeze();
-
 		spin_lock_irq(&rq->lock);
 
 		if (cpu_is_offline(cpu)) {
_