[PATCH] add cpu_relax to hrtimer_cancel

Add a cpu_relax() to the hand-coded spinwait in hrtimer_cancel().

Signed-off-by: Joe Korty <joe.korty@ccur.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/hrtimer.c

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index f181ff4..d2a7296 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -501,6 +501,7 @@
 
 		if (ret >= 0)
 			return ret;
+		cpu_relax();
 	}
 }