[RFC patch 6/8] timekeeping: Delay update of clock->cycle_last

[Thomas Gleixner]

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>
---
 kernel/time/timekeeping.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6/kernel/time/timekeeping.c
===================================================================
--- linux-2.6.orig/kernel/time/timekeeping.c
+++ linux-2.6/kernel/time/timekeeping.c
@@ -1120,7 +1120,7 @@ static cycle_t logarithmic_accumulation(
 
 	/* 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);
@@ -1235,6 +1235,8 @@ 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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