linux-kernel - Re: [RFC][PATCH] Fix cpu hotplug hang

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Message-ID: <20081230062812.GA30975@elte.hu>
Date:	Tue, 30 Dec 2008 07:28:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Nathan Lynch <ntl@...ox.com>
Cc:	Sebastien Dugue <sebastien.dugue@...l.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jean Pierre Dion <jean-pierre.dion@...l.net>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	Gilles Carry <Gilles.Carry@....bull.net>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [RFC][PATCH] Fix cpu hotplug hang


* Nathan Lynch <ntl@...ox.com> wrote:

> Sebastien Dugue wrote:
> > On Mon, 1 Dec 2008 14:09:07 +0100 Sebastien Dugue <sebastien.dugue@...l.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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