linux-kernel - Re: [PATCH] time, ntp: Do not update time

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Date:	Tue, 10 Feb 2015 15:01:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	linux-kernel@...r.kernel.org, John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [PATCH] time, ntp: Do not update time_state in middle of leap
 second

On Sat, Feb 07, 2015 at 01:29:39PM -0500, Prarit Bhargava wrote:
> During leap second insertion testing it was noticed that a small window
> exists where the time_state could be reset such that
> time_state = TIME_OK, which then causes the leap second to not occur, or
> causes the entire leap second state machine to fail.
> 
> While this is highly unlikely to ever happen in the real world it is
> still something we should protect against, as breaking the state machine
> is obviously bad.
> 
> If the time_state == TIME_OOP (ie, the leap second is in progress) do not
> allow an external update to time_state.
> 
> [v2]: Only block time_state change when TIME_OOP
> 
> Signed-off-by: Prarit Bhargava <prarit@...hat.com>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Miroslav Lichvar <mlichvar@...hat.com>

John, ACK?
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