From: Ron <ron@voicetronix.com>
Date: Fri, 8 May 2009 13:24:49 +0000 (+0930)
Subject: sched: Fix fallback sched_clock()'s offset when using jiffies
X-Git-Tag: v2.6.30-rc7~29^2
X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=commitdiff_plain;h=92d23f703c608fcb2c8edd74a3fd0f4031e18606

sched: Fix fallback sched_clock()'s offset when using jiffies

Account for the initial offset to the jiffy count.

[ Impact: fix printk timestamps on architectures using fallback sched_clock() ]

Signed-off-by: Ron Lee <ron@debian.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 819f17ac796e..e1d16c9a7680 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -38,7 +38,8 @@
  */
 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;