[tip:timers/core] timekeeping: Delay update of clock->cycle_last

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Commit-ID:  7ec98e15aa049b7a2ca73485f31cf4f90c34e2dd
Gitweb:     http://git.kernel.org/tip/7ec98e15aa049b7a2ca73485f31cf4f90c34e2dd
Author:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Thu, 21 Feb 2013 22:51:39 +0000
Committer:  John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Thu, 4 Apr 2013 13:18:31 -0700

timekeeping: Delay update of clock->cycle_last

For calculating the new timekeeper values store the new cycle_last
value in the timekeeper and update the clock->cycle_last just when we
actually update the new values.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
 kernel/time/timekeeping.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 4c276b2..38ac782 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1271,7 +1271,7 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
 
 	/* Accumulate one shifted interval */
 	offset -= interval;
-	tk->clock->cycle_last += interval;
+	tk->cycle_last += interval;
 
 	tk->xtime_nsec += tk->xtime_interval << shift;
 	accumulate_nsecs_to_secs(tk);
@@ -1386,6 +1386,8 @@ static void update_wall_time(void)
 	 */
 	accumulate_nsecs_to_secs(tk);
 
+	/* Update clock->cycle_last with the new value */
+	clock->cycle_last = tk->cycle_last;
 	timekeeping_update(tk, false);
 
 out:
--
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