[PATCH] time: add an offline-cpu check in add_timer_on()

[Miao Xie <miaox@cn.fujitsu.com>]

Hi everyone,
   I think we need a check in the function add_timer_on() to avoid adding a
timer into the timer list of an offline cpu.

This patch fixes this problem in add_timer_on().

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

---
  kernel/timer.c |    1 +
  1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/timer.c b/kernel/timer.c
index a05817c..6189561 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -451,6 +451,7 @@ void add_timer_on(struct timer_list *timer, int cpu)
  	timer_stats_timer_set_start_info(timer);
  	BUG_ON(timer_pending(timer) || !timer->function);
  	spin_lock_irqsave(&base->lock, flags);
+	BUG_ON(cpu_is_offline(cpu));
  	timer_set_base(timer, base);
  	internal_add_timer(base, timer);
  	spin_unlock_irqrestore(&base->lock, flags);
-- 
1.5.3.7