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Date: Wed, 10 Oct 2007 01:21:18 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Greg KH <greg@kroah.com>
cc: Olof Johansson <olof@lixom.net>, Greg KH <gregkh@suse.de>,
       "Rafael J. Wysocki" <rjw@sisk.pl>, "Theodore Ts'o" <tytso@mit.edu>,
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       Chuck Wolber <chuckw@quantumlinux.com>, stable@kernel.org,
       alan@lxorguk.ukuu.org.uk
Subject: Re: [stable] [patch 09/12] Fix SMP poweroff hangs
In-Reply-To: <20071009222003.GA21228@kroah.com>
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References: <20071008180406.052382073@mini.kroah.org> <20071008180633.GJ7627@kroah.com> <20071009151702.GA19209@lixom.net> <20071009222003.GA21228@kroah.com>
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On Tue, 9 Oct 2007, Greg KH wrote:

> On Tue, Oct 09, 2007 at 10:17:02AM -0500, Olof Johansson wrote:
> > On Mon, Oct 08, 2007 at 11:06:33AM -0700, Greg KH wrote:
> > > From: Mark Lord <lkml@rtr.ca>
> > > 
> > > commit 4047727e5ae33f9b8d2b7766d1994ea6e5ec2991 from upstream
> > > 
> > > We need to disable all CPUs other than the boot CPU (usually 0) before
> > > attempting to power-off modern SMP machines.  This fixes the
> > > hang-on-poweroff issue on my MythTV SMP box, and also on Thomas Gleixner's
> > > new toybox.
> > 
> > Paul Mackerras has reported crashes when rebooting some older ppc64
> > systems due to this patch.
> > 
> > See http://ozlabs.org/pipermail/linuxppc-dev/2007-October/043969.html.
> 
> Has anything been done in mainline to possibly fix this?
> 
> If not, I think we'll leave it in, as it does solve a number of reported
> problems.

Wrapping it into a #ifdef CONFIG_X86 would be sufficient.

	tglx

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