[PATCH] Prepare for SMP suspend

From: Pavel Machek <pavel@ucw.cz>

Its very bad idea to freeze migration threads, as it crashes machine upon
next call to "schedule()".  In refrigerator, I had one "wake_up_process()"
too many.  This fixes it.
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/power/process.c

@@ -109,7 +109,6 @@ void thaw_processes(void)
 			wake_up_process(p);
 		} else
 			printk(KERN_INFO " Strange, %s not stopped\n", p->comm );
-		wake_up_process(p);
 	} while_each_thread(g, p);
 
 	read_unlock(&tasklist_lock);

kernel/sched.c

@@ -3571,6 +3571,7 @@ static int migration_call(struct notifier_block *nfb, unsigned long action,
 		p = kthread_create(migration_thread, hcpu, "migration/%d",cpu);
 		if (IS_ERR(p))
 			return NOTIFY_BAD;
+		p->flags |= PF_NOFREEZE;
 		kthread_bind(p, cpu);
 		/* Must be high prio: stop_machine expects to yield to it. */
 		rq = task_rq_lock(p, &flags);