linux-kernel - Re: [stable] [patch 09/12] Fix SMP poweroff hangs

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Date:	Tue, 9 Oct 2007 15:20:03 -0700
From:	Greg KH <greg@...ah.com>
To:	Olof Johansson <olof@...om.net>
Cc:	Greg KH <gregkh@...e.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Theodore Ts'o <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	torvalds@...ux-foundation.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	linux-kernel@...r.kernel.org,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Domenico Andreoli <cavokz@...il.com>,
	Mark Lord <mlord@...ox.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>, akpm@...ux-foundation.org,
	Chuck Wolber <chuckw@...ntumlinux.com>, stable@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [stable] [patch 09/12] Fix SMP poweroff hangs

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@....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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