linux-kernel - [PATCH] clockevents: avoid unnecessary reprograming of event timer

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Message-Id: <20090212222326.394E121B187@localhost>
Date:	Thu, 12 Feb 2009 14:23:25 -0800 (PST)
From:	md@...gle.com (Michael Davidson)
To:	mbligh@...gle.com, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] clockevents: avoid unnecessary reprograming of event timer

From: Michael Davidson <md@...gle.com>

Don't reprogram the event timer if it is already set to expire
at the correct time.

Signed-off-by: Michael Davidson <md@...gle.com>
---
--- linux-2.6.29-rc4.orig/kernel/time/clockevents.c	2009-02-12 13:13:24.000000000 -0800
+++ linux-2.6.29-rc4/kernel/time/clockevents.c	2009-02-12 13:25:42.525558000 -0800
@@ -103,6 +103,9 @@
 	if (delta <= 0)
 		return -ETIME;
 
+	if (ktime_equal(dev->next_event, expires))
+		return 0;
+
 	dev->next_event = expires;
 
 	if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
--
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