linux-kernel - Re: [linux-pm] [PATCH -mm 2/2] kexec jump -v11: save/restore device state

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Message-id: <alpine.LFD.1.10.0806101400090.14381@localhost.localdomain>
Date:	Tue, 10 Jun 2008 14:01:10 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [PATCH -mm 2/2] kexec jump -v11: save/restore device
 state



On Tue, 10 Jun 2008, Huang, Ying wrote:

> This patch implements devices state save/restore before after kexec.
> 
> 
> This patch together with features in kexec_jump patch can be used for
> following:
> 
> - A simple hibernation implementation without ACPI support. You can
>   kexec a hibernating kernel, save the memory image of original system
>   and shutdown the system. When resuming, you restore the memory image
>   of original system via ordinary kexec load then jump back.

What part of ACPI's role in hibernation are you trying to avoid
1. enabling wake devices
2. removing power from the system
3. something else?

thanks,
-Len
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