Add schedule_timeout_killable

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 95395c1..e4921aa 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -314,6 +314,7 @@
 #define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
 extern signed long FASTCALL(schedule_timeout(signed long timeout));
 extern signed long schedule_timeout_interruptible(signed long timeout);
+extern signed long schedule_timeout_killable(signed long timeout);
 extern signed long schedule_timeout_uninterruptible(signed long timeout);
 asmlinkage void schedule(void);