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

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Message-ID: <20071009151702.GA19209@lixom.net>
Date:	Tue, 9 Oct 2007 10:17:02 -0500
From:	Olof Johansson <olof@...om.net>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mark Lord <mlord@...ox.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [patch 09/12] Fix SMP poweroff hangs

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.


-Olof

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