time: Avoid making adjustments if we haven't accumulated anything
authorJohn Stultz <john.stultz@linaro.org>
Wed, 12 Sep 2012 00:49:52 +0000 (20:49 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 2 Oct 2012 16:47:51 +0000 (09:47 -0700)
commit4ffa9a8069801e36e2aceed5a77482b8b0841757
tree6a43365a3f6fb73b73e7b20a0f5e2c32b6e72fa6
parent44fa9a0111168832510f8add6d589e73eac6793d
time: Avoid making adjustments if we haven't accumulated anything

commit bf2ac312195155511a0f79325515cbb61929898a upstream

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 <john.stultz@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1345595449-34965-5-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/time/timekeeping.c