linux-kernel - Re: [PATCH -mm 2/2] Hibernation: Arbitrary boot kernel support on x86

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Date:	Sat, 25 Aug 2007 21:51:53 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	david@...g.hm
Cc:	Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH -mm 2/2] Hibernation: Arbitrary boot kernel support on x86_64

On Saturday, 25 August 2007 20:32, david@...g.hm wrote:
> On Sat, 25 Aug 2007, Rafael J. Wysocki wrote:
> 
> > On Friday, 24 August 2007 22:46, Pavel Machek wrote:
> >> Hi!
> >>
> >>> From: Rafael J. Wysocki <rjw@...k.pl>
> >>>
> >>> Make it possible to restore a hibernation image on x86_64 with the help of a
> >>> kernel different from the one in the image.
> >>>
> >>> The idea is to split the core restoration code into two separate parts and to
> >>> place each of them in a different page.  The first part belongs to the boot
> >>
> >> What happens in case where both parts want to be
> >> at the same place? (Like kernel being restored is 4KB smaller, so that
> >> routines now collide?)
> >
> > Bad things, but I can't see how to avoid that reliably.
> 
> can you at least detect it reliably? (feed a program both kernel images 
> and have it tell you 'yes/no')

Well, I have an idea how to handle that, but I need to test it.  Stay tuned. :-)

Greetings,
Rafael
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