[PATCH] Call get_softirq_time() only when necessary in run_hrtimer_queue()

[Dimitri Sivanich <sivanich@sgi.com>]

It seems that run_hrtimer_queue() is calling get_softirq_time() more
often than it needs to.

With this patch, it only calls get_softirq_time() if there's a
pending timer.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Index: linux/kernel/hrtimer.c
===================================================================
--- linux.orig/kernel/hrtimer.c	2006-03-28 11:46:45.279722496 -0600
+++ linux/kernel/hrtimer.c	2006-03-28 11:51:36.722469752 -0600
@@ -606,6 +606,9 @@ static inline void run_hrtimer_queue(str
 {
 	struct rb_node *node;
 
+	if (!base->first)
+		return;
+
 	if (base->get_softirq_time)
 		base->softirq_time = base->get_softirq_time();