linux-kernel - [PATCH] time: Fix CLOCK_MONOTONIC inconsistency during leapsecond

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Date:	Wed, 30 May 2012 10:54:57 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	John Stultz <john.stultz@...aro.org>, stable@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] time: Fix CLOCK_MONOTONIC inconsistency during leapsecond

Make sure we update wall_to_monotonic when adding a leapsecond.
This could otherwise cause discontinuities in CLOCK_MONOTONIC.

This fixes a regression caused by
6b43ae8a619d17c4935c3320d2ef9e92bdeed05d

CC: stable@...nel.org
CC: Thomas Gleixner <tglx@...utronix.de>
Reported-by: Richard Cochran <richardcochran@...il.com>
Tested-by: Richard Cochran <richardcochran@...il.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/timekeeping.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 6e46cac..6f46a00 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -962,6 +962,7 @@ 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 */
@@ -1077,6 +1078,7 @@ 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);
-- 
1.7.3.2.146.gca209

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