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authorJohn Stultz <john.stultz@linaro.org>2012-07-17 13:33:50 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-19 08:58:27 -0700
commitc33f2424c3941986d402c81d380d4e805870a20f (patch)
tree760820ea1cd58f4ba8bc6addb09df423fb671409 /kernel
parent96bab736bad82423c2b312d602689a9078481fa9 (diff)
timekeeping: Fix CLOCK_MONOTONIC inconsistency during leapsecond
This is a backport of fad0c66c4bb836d57a5f125ecd38bed653ca863a which resolves a bug the previous commit. 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> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/timekeeping.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index c444da085a22..ac5b225f6a05 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -824,6 +824,7 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
xtime.tv_sec++;
leap = second_overflow(xtime.tv_sec);
xtime.tv_sec += leap;
+ wall_to_monotonic.tv_sec -= leap;
}
/* Accumulate raw time */
@@ -934,7 +935,7 @@ static void update_wall_time(void)
xtime.tv_sec++;
leap = second_overflow(xtime.tv_sec);
xtime.tv_sec += leap;
-
+ wall_to_monotonic.tv_sec -= leap;
}
/* check to see if there is a new clocksource to use */