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timekeeping: Delay update of clock->cycle_last

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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@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner 2013-02-21 22:51:39 +00:00 • committed by John Stultz
parent 14a3b6abe9
commit 7ec98e15aa
1 changed files with 3 additions and 1 deletions
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4
kernel/time/timekeeping.c
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@ -1271,7 +1271,7 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
/* Accumulate one shifted interval */ /* Accumulate one shifted interval */
offset -= interval; offset -= interval;
tk->clock->cycle_last += interval; tk->cycle_last += interval;
tk->xtime_nsec += tk->xtime_interval << shift; tk->xtime_nsec += tk->xtime_interval << shift;
accumulate_nsecs_to_secs(tk); accumulate_nsecs_to_secs(tk);
@ -1386,6 +1386,8 @@ static void update_wall_time(void)
*/ */
accumulate_nsecs_to_secs(tk); accumulate_nsecs_to_secs(tk);
/* Update clock->cycle_last with the new value */
clock->cycle_last = tk->cycle_last;
timekeeping_update(tk, false); timekeeping_update(tk, false);
out: out: