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

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Message-ID: <20071230215745.GB31386@elte.hu>
Date:	Sun, 30 Dec 2007 22:57:45 +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:

> > what's exactly in the hibernation image? Dirty data i suppose
> 
> No, everything, including the kernel code, page tables etc. :-)
> 
> > - but what about kernel-internal pages. What if we go from SLAB to 
> > SLUB? What if the size of a structure changes? Etc.
> 
> We can go from SLAB to SLUB just fine, it doesn't matter.  The only 
> thing that matters is we have to jump to the right address at the end 
> of core_restore_code() (defined in arch/x86/kernel/suspend_asm_64.S).

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.

	Ingo
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