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>

1 files changed, 2 insertions, 1 deletions

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;