Export add_timer_on for modules

Needed in followon patch.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

kernel/timer.c

diff --git a/kernel/timer.c b/kernel/timer.c
index cffffad..e2c47b8 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -756,6 +756,7 @@
 	wake_up_idle_cpu(cpu);
 	spin_unlock_irqrestore(&base->lock, flags);
 }
+EXPORT_SYMBOL_GPL(add_timer_on);
 
 /**
  * del_timer - deactive a timer.