From 3055addadbe9bfb2365006a1c13fd342a8d30d52 Mon Sep 17 00:00:00 2001
From: Dimitri Sivanich <sivanich@sgi.com>
Date: Fri, 31 Mar 2006 02:31:20 -0800
Subject: [PATCH] hrtimer: call get_softirq_time() only when necessary in
 run_hrtimer_queue()

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 kernel/hrtimer.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 49cbf7cffeb..f181ff4dd32 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -606,6 +606,9 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
 {
 	struct rb_node *node;
 
+	if (!base->first)
+		return;
+
 	if (base->get_softirq_time)
 		base->softirq_time = base->get_softirq_time();
 
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