linux-kernel - Re: Problems with SMP & ACPI powering off

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Message-Id: <200709281455.29069.rjw@sisk.pl>
Date:	Fri, 28 Sep 2007 14:55:28 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	Mark Lord <lkml@....ca>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	simon.derr@...l.net
Subject: Re: Problems with SMP & ACPI powering off

On Friday, 28 September 2007 06:57, Len Brown wrote:
> On Thursday 27 September 2007 18:00, Rafael J. Wysocki wrote:
> > On Thursday, 27 September 2007 23:29, Mark Lord wrote:
> > > Question:  do we disable all CPUs except 0 when doing ACPI power off?
> > 
> > No, but we should.
> 
> We used to.
> It is absolutely mandatory -- else it confuses the BIOS on some boards
> b/c it isn't expecting SMM to get entered from other than cpu0.

Can we use the CPU hotplug for that, like in the suspend/hibernation case?

Rafael
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