linux-kernel - Re: [PATCH] Hibernation: Document __save_processor

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Message-Id: <200712302248.03567.rjw@sisk.pl>
Date:	Sun, 30 Dec 2007 22:48:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@...e.cz>
Subject: Re: [PATCH] Hibernation: Document __save_processor_state() on x86-64

On Sunday, 30 of December 2007, Ingo Molnar wrote:
> 
> * Rafael J. Wysocki <rjw@...k.pl> wrote:
> 
> > > But i'm wondering - are we really ever resuming to a different 
> > > kernel version, for this to be an issue?
> > 
> > The boot kernel may be different from the kernel within the image, if 
> > that's what you're asking for.
> 
> how different can it be, for resume to work? I mean, we'll have deeply 
> kernel version dependent variables in RAM. Am i missing something 
> obvious?

On x86-64 it can be almost totally different (by restoring a hibernation image
we replace the entire contents of RAM with almost no constraints).

[Well, using a relocatable kernel for restoring an image with nonrelocatable one
or vice versa is rather not the best idea, but everything else should work in
theory.]

On i386 the boot kernel is still required to be the same as the one in the
image.

Greetings,
Rafael
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