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timekeeping: Fix CLOCK_MONOTONIC inconsistency during leapsecond

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commit fad0c66c4b upstream.

Commit 6b43ae8a61 (ntp: Fix leap-second hrtimer livelock) broke the
leapsecond update of CLOCK_MONOTONIC. The missing leapsecond update to
wall_to_monotonic causes discontinuities in CLOCK_MONOTONIC.

Adjust wall_to_monotonic when NTP inserted a leapsecond.

Reported-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Richard Cochran <richardcochran@gmail.com>
Link: http://lkml.kernel.org/r/1338400497-12420-1-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Stultz 2012-05-30 10:54:57 -07:00 committed by Greg Kroah-Hartman
parent 3410afedcd
commit d913c02b0a
1 changed files with 2 additions and 0 deletions
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2
kernel/time/timekeeping.c
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@ -964,6 +964,7 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
timekeeper.xtime.tv_sec++;
leap = second_overflow(timekeeper.xtime.tv_sec);
timekeeper.xtime.tv_sec += leap;
timekeeper.wall_to_monotonic.tv_sec -= leap;
}
/* Accumulate raw time */
@ -1079,6 +1080,7 @@ static void update_wall_time(void)
timekeeper.xtime.tv_sec++;
leap = second_overflow(timekeeper.xtime.tv_sec);
timekeeper.xtime.tv_sec += leap;
timekeeper.wall_to_monotonic.tv_sec -= leap;
}
timekeeping_update(false);