linux-kernel - Re: [PATCH 0/5 v2] Fixes for leapsecond expiring early ABS_TIME CLOCK

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Message-ID: <20150612145211.GA22489@codemonkey.org.uk>
Date:	Fri, 12 Jun 2015 10:52:12 -0400
From:	Dave Jones <davej@...emonkey.org.uk>
To:	John Stultz <john.stultz@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Prarit Bhargava <prarit@...hat.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Jan Kara <jack@...e.cz>, Jiri Bohac <jbohac@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH 0/5 v2] Fixes for leapsecond expiring early ABS_TIME
 CLOCK_REALTIME timers

On Thu, Jun 11, 2015 at 03:54:52PM -0700, John Stultz wrote:
 > So this is a second round at trying to address the issue, trying
 > to integrate feedback from Ingo and Thomas, trying to simplify
 > what I can. I've also split out the changes so each can be
 > more easily reviewed. Its still not tiny, but its simpler.
 > 
 > This series is against tip/timers/core, and the first patch isn't
 > strictly related but is a fix that is needed in tip/timers/core.
 > 
 > As Prarit reported here:
 > https://lkml.org/lkml/2015/5/27/458
 > 
 > Since the leapsecond is applied at timer tick time, and not
 > the actual second edge, ABS_TIME CLOCK_REALTIME timers set for
 > right after the leapsecond could fire a second early, since
 > some timers may be expired before we trigger the timekeeping
 > timer, which then applies the leapsecond.
 > 
 > Thus this patch series tries to address this issue, including
 > extending the leap-a-day test to catch this problem, as well
 > as other relevant fixups I found while working on the code.
 > 
 > This series has only had limited testing, so I wanted to send
 > it out for initial review and comment. Folks can grab this tree
 > via git for testing here:
 > https://git.linaro.org/people/john.stultz/linux.git dev/early-leap-timer

Any idea how far back this reaches ? Ie, which longterm stable releases
might be affected by this ?

(It really creeps me out that we're still changing this code so close
 to the next leap second event).

	Dave

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