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Date:	Tue, 03 Jul 2007 21:56:30 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...l.org>,
	john stultz <johnstul@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Stable Team <stable@...nel.org>,
	"Fortier,Vincent [Montreal]" <Vincent.Fortier1@...GC.CA>
Subject: Re: [PATCH] NTP: remove clock_was_set() call to prevent deadlock

On Tue, 2007-07-03 at 20:05 +0200, Thomas Gleixner wrote:
> The clock_was_set() call in seconds_overflow() which happens only when
> leap seconds are inserted / deleted is wrong in two aspects:
> 
> 1. it results in a call to on_each_cpu() with interrupts disabled
> 2. it is potential deadlock source vs. call_lock in smp_call_function()
> 
> The only possible side effect of the removal might be, that an absolute
> CLOCK_REALTIME timer fires 1 second too late, in the rare case of leap
> second deletion and an absolute CLOCK_REALTIME timer which expires in
> the affected time frame. It will never fire too early.
> 
> This was probably observed by the reporter of a June 30th -> July 1st
> hang: http://lkml.org/lkml/2007/7/3/

Ooops, missed the full reference:

http://lkml.org/lkml/2007/7/3/103

	tglx


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