linux-kernel - Re: nonboot cpu on SMP suspend

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Date:	Thu, 19 Mar 2009 00:00:31 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Li Yang <leoli@...escale.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: nonboot cpu on SMP suspend

On Wednesday 18 March 2009, Li Yang wrote:
> Hi all,
> 
> I'm curious why we need to un-plug all the nonboot cpus before suspend
> and start them all over again after the suspend(ACPI sleep)?  I mean
> if we can bring the booting cpu back to the exact state as before
> suspend, why can't we just do the same for non-booting cpus?  And that
> will be much faster.  Any thought?  Thanks.

Because we need to enter the BIOS with one CPU on-line only.

Thanks,
Rafael
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