From: Andrew Morton <akpm@osdl.org>

Relax the CPU in the del_timer_sync() busywait loop.

Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/timer.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN kernel/timer.c~del_timer_sync-add-cpu_relax kernel/timer.c
--- a/kernel/timer.c~del_timer_sync-add-cpu_relax
+++ a/kernel/timer.c
@@ -374,6 +374,7 @@ int del_timer_sync(struct timer_list *ti
 		int ret = try_to_del_timer_sync(timer);
 		if (ret >= 0)
 			return ret;
+		cpu_relax();
 	}
 }
 
_