From: John Stultz Date: Wed, 22 Aug 2012 00:30:49 +0000 (-0400) Subject: time: Avoid making adjustments if we haven't accumulated anything X-Git-Tag: v3.6-rc4~26^2 X-Git-Url: http://pileus.org/git/?p=~andy%2Flinux;a=commitdiff_plain;h=bf2ac312195155511a0f79325515cbb61929898a time: Avoid making adjustments if we haven't accumulated anything If update_wall_time() is called and the current offset isn't large enough to accumulate, avoid re-calling timekeeping_adjust which may change the clock freq and can cause 1ns inconsistencies with CLOCK_REALTIME_COARSE/CLOCK_MONOTONIC_COARSE. Signed-off-by: John Stultz Cc: Prarit Bhargava Cc: Ingo Molnar Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1345595449-34965-5-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner --- diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index a5a9389c4c3..0c1485e42be 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1152,6 +1152,10 @@ static void update_wall_time(void) offset = (clock->read(clock) - clock->cycle_last) & clock->mask; #endif + /* Check if there's really nothing to do */ + if (offset < tk->cycle_interval) + goto out; + /* * With NO_HZ we may have to accumulate many cycle_intervals * (think "ticks") worth of time at once. To do this efficiently,