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

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Message-ID: <557AF49C.7060702@redhat.com>
Date:	Fri, 12 Jun 2015 11:02:52 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Dave Jones <davej@...emonkey.org.uk>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org,
	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 06/12/2015 10:59 AM, Dave Jones wrote:
> On Fri, Jun 12, 2015 at 10:55:57AM -0400, Prarit Bhargava wrote:
>  
>  > >  > 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 ?
>  > 
>  > Likely occurs in any kernel after NOHZ was introduced.
> 
> At least on 3.14, it seems to happen even if NOHZ is disabled.

Ouch. :(

I wonder if we've every synched the tick edge with the second edge.  Your test
implies the answer is "no".

P.
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