Date: Tue, 30 Dec 2008 07:28:12 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Nathan Lynch <ntl@pobox.com>
Cc: Sebastien Dugue <sebastien.dugue@bull.net>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Jean Pierre Dion <jean-pierre.dion@bull.net>,
       Will Schmidt <will_schmidt@vnet.ibm.com>,
       Gilles Carry <Gilles.Carry@ext.bull.net>,
       Paul Mackerras <paulus@samba.org>
Subject: Re: [RFC][PATCH] Fix cpu hotplug hang
Message-ID: <20081230062812.GA30975@elte.hu>
References: <20081201140907.56743abd@bull.net> <20081215123128.172b21be@bull.net> <20081230001729.GD6958@localdomain>
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* Nathan Lynch <ntl@pobox.com> wrote:

> Sebastien Dugue wrote:
> > On Mon, 1 Dec 2008 14:09:07 +0100 Sebastien Dugue <sebastien.dugue@bull.net> wrote:
> > 
> > > 
> > >   here is a patch that fixes a CPU hotplug hang I get on a Power6
> > > box. It may not be the only possible fix but it appears to be the
> > > cleanest I can think of at the moment.
> > > 
> > >   Comments welcomed.
> > 
> >   Ingo, Thomas, anybody care to comment on the hang and this possible fix?
> 
> FWIW, I was able to recreate this hang with 2.6.28 on a 8-way Power5 
> system, and Sebastien's patch does appear to fix the problem for my 
> testcase, which does a few hundred offline/online operations.

i've applied Sebastien's patch to tip/timers/hrtimers. Good catch! I've 
also tagged it for a -stable backport.

	Ingo
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