From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757963Ab2GRARU (ORCPT ); Tue, 17 Jul 2012 20:17:20 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:52583 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754141Ab2GRANM (ORCPT ); Tue, 17 Jul 2012 20:13:12 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg KH , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Richard Cochran , John Stultz , Thomas Gleixner , Prarit Bhargava , John Stultz Subject: [ 15/23] timekeeping: Fix CLOCK_MONOTONIC inconsistency during leapsecond Date: Tue, 17 Jul 2012 17:12:08 -0700 Message-Id: <20120717232330.482296280@linuxfoundation.org> X-Mailer: git-send-email 1.7.10.1.362.g242cab3 In-Reply-To: <20120717232329.276003806@linuxfoundation.org> References: <20120717232455.GA5994@kroah.com> <20120717232329.276003806@linuxfoundation.org> User-Agent: quilt/0.60-20.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greg KH 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: John Stultz 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 Signed-off-by: John Stultz Tested-by: Richard Cochran Link: http://lkml.kernel.org/r/1338400497-12420-1-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner Cc: Prarit Bhargava Cc: Thomas Gleixner Signed-off-by: John Stultz Signed-off-by: Greg Kroah-Hartman --- kernel/time/timekeeping.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -824,6 +824,7 @@ static cycle_t logarithmic_accumulation( 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 */