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From 7a063ddaad98f05f7976e0e8c9c1455cc9d0f5da Mon Sep 17 00:00:00 2001
From: John Stultz <john.stultz@linaro.org>
Date: Wed, 30 May 2012 10:54:57 -0700
Subject: [PATCH 076/109] 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>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
kernel/time/timekeeping.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 4780a7d..5c9b67e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -938,6 +938,7 @@ 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 */
@@ -1048,7 +1049,7 @@ 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 */
--
1.7.7.6
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