linux-kernel - [PATCH] fix for sched_clock() when using jiffies

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Message-ID: <20090508132449.GV5417@homer.shelbyville.oz>
Date:	Fri, 8 May 2009 22:54:49 +0930
From:	Ron <ron@...cetronix.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fix for sched_clock() when using jiffies


Account for the initial offset to the jiffy count.
---
 kernel/sched_clock.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index a0b0852..a1567b1 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -37,7 +37,8 @@
  */
 unsigned long long __attribute__((weak)) sched_clock(void)
 {
-	return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
+	return (unsigned long long)(jiffies - INITIAL_JIFFIES)
+					* (NSEC_PER_SEC / HZ);
 }
 
 static __read_mostly int sched_clock_running;
-- 
1.6.1.3

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