[PATCH] out_of_memory() locking fix

I seem to have lost this read_unlock().

While we're there, let's turn that interruptible sleep unto uninterruptible,
so we don't get a busywait if signal_pending().  (Again.  We seem to have a
habit of doing this).
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

mm/oom_kill.c

@@ -355,6 +355,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order)
 	}
 
 out:
+	read_unlock(&tasklist_lock);
 	cpuset_unlock();
 	if (mm)
 		mmput(mm);
@@ -364,5 +365,5 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order)
 	 * retry to allocate memory unless "p" is current
 	 */
 	if (!test_thread_flag(TIF_MEMDIE))
-		schedule_timeout_interruptible(1);
+		schedule_timeout_uninterruptible(1);
 }