linux-kernel - Re: [RFC][PATCH 4/5] timekeeping: Fix CLOCK

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Date:	Thu, 12 Dec 2013 14:25:18 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Prarit Bhargava <prarit@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	stable <stable@...r.kernel.org>
Subject: Re: [RFC][PATCH 4/5] timekeeping: Fix CLOCK_TAI timer/nanosleep
 delays


* John Stultz <john.stultz@...aro.org> wrote:

> A think-o in the calculation of the monotonic -> tai time offset
> results in CLOCK_TAI timers and nanosleeps to expire late (the
> latency is ~2x the tai offset).
> 
> Fix this by adding the tai offset from the realtime offset instead
> of subtracting.

Hm, it looks like the whole CLOCK_TAI feature was rushed in, with not 
enough testing done.

If the bugs extend to more than this two-liner then for -stable it 
might be better to just disable CLOCK_TAI (userspace can deal with it 
just fine), and queue up the right fixes for the next merge window or 
so.

Thanks,

	Ingo
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