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

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Message-ID: <20071231104311.GA30003@elte.hu>
Date:	Mon, 31 Dec 2007 11:43:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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


* Rafael J. Wysocki <rjw@...k.pl> wrote:

> > ok, just to make sure we are talking about the same thing. Do you 
> > mean we can restore an image saved by v2.6.12 into v2.6.24? I.e. a 
> > 2.6.24 kernel will be able to run a 2.6.12 kernel's hibernation 
> > image, with all the kernel internal data from v2.6.12, etc? No way 
> > can that work.
> 
> Well, not exactly.  The support for different boot and image kernels 
> has only been merged recently, but we can use the current git to 
> restore 2.6.24-rc6-mm1, for example.
> 
> The trick is to pass a little additional information in the image 
> header that can be used by the boot kernel to locate the entry point 
> to the image kernel and the image kernel's page tables.

ok - i thought you meant that there's a general capability to resume 
across kernel versions. (which would be close to impossible without some 
major surgery.)

btw., in what way is this different from kexec?

	Ingo
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