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

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Message-ID: <20081230001729.GD6958@localdomain>
Date:	Mon, 29 Dec 2008 18:17:29 -0600
From:	Nathan Lynch <ntl@...ox.com>
To:	Sebastien Dugue <sebastien.dugue@...l.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	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

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.
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