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Date: Tue, 9 Oct 2007 15:20:03 -0700
From: Greg KH <greg@kroah.com>
To: Olof Johansson <olof@lixom.net>
Cc: Greg KH <gregkh@suse.de>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       "Theodore Ts'o" <tytso@mit.edu>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>,
       Thomas Gleixner <tglx@linutronix.de>, torvalds@linux-foundation.org,
       Justin Forbes <jmforbes@linuxtx.org>, linux-kernel@vger.kernel.org,
       Chris Wedgwood <reviews@ml.cw.f00f.org>,
       Domenico Andreoli <cavokz@gmail.com>, Mark Lord <mlord@pobox.com>,
       Randy Dunlap <rdunlap@xenotime.net>,
       Michael Krufky <mkrufky@linuxtv.org>, Chuck Ebbert <cebbert@redhat.com>,
       Dave Jones <davej@redhat.com>, akpm@linux-foundation.org,
       Chuck Wolber <chuckw@quantumlinux.com>, stable@kernel.org,
       alan@lxorguk.ukuu.org.uk
Subject: Re: [stable] [patch 09/12] Fix SMP poweroff hangs
Message-ID: <20071009222003.GA21228@kroah.com>
References: <20071008180406.052382073@mini.kroah.org> <20071008180633.GJ7627@kroah.com> <20071009151702.GA19209@lixom.net>
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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.

thanks,

greg k-h
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