linux-kernel - Re: [PATCH -stable] ntp: Correct TAI offset during leap second

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Message-ID: <1339944223.4942.240.camel@deadeye.wl.decadent.org.uk>
Date:	Sun, 17 Jun 2012 15:43:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	John Stultz <johnstul@...ibm.com>
Cc:	stable@...r.kernel.org, Richard Cochran <richardcochran@...il.com>,
	Dave Jones <davej@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -stable]  ntp: Correct TAI offset during leap second

On Fri, 2012-06-15 at 11:56 -0700, John Stultz wrote:
> Hey Greg,
>      Forgot to cc stable on this one. Thanks to Dave Jones for noticing!
> -john
> 
> ------------------
> 
> From: Richard Cochran<richardcochran@...il.com>
> 
> commit dd48d708ff3e917f6d6b6c2b696c3f18c019feed upstream.
> 
> When repeating a UTC time value during a leap second (when the UTC
> 
> time should be 23:59:60), the TAI timescale should not stop. The kernel
> 
> NTP code increments the TAI offset one second too late. This patch fixes
> 
> the issue by incrementing the offset during the leap second itself.
[...]

This doesn't apply to 3.2.y, unsurprisingly.  Let me know if there are
any urgent leap second fixes that will be needed there.

Ben.

-- 
Ben Hutchings
Time is nature's way of making sure that everything doesn't happen at once.

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