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

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Message-Id: <1188069225.9529.23.camel@johannes.berg>
Date:	Sat, 25 Aug 2007 21:13:45 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Pavel@...p2.linux-foundation.org, Andi Kleen <ak@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] Re: [PATCH -mm 2/2] Hibernation: Arbitrary boot
	kernel support on x86_64

On Fri, 2007-08-24 at 16:23 -0700, Andrew Morton wrote:

> The preferred way of doing this is via Kconfig, please.  ie: add a
> CONFIG_HIBERNATION_HEADER to arch/x86_64/Kconfig.

> It would be better to do something like this in (say) suspend.h:
> 
> #ifdef CONFIG_HIBERNATION_HEADER
> extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
> extern int arch_hibernation_header_restore(void *addr);
> #else
> static inline int arch_hibernation_header_save(void *addr,

In fact, I guess we don't need to bother with this at all. The generic
code for doing this (via the utsname based header) is tiny, so as far as
I can tell it could just be made weak symbols (by this I mean
init_header_complete() and check_image_kernel()), and then all the
#ifdefs can just go.

johannes

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