linux-kernel - Re: [PATCH 16/20] swsusp: do not use virt_to

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Message-ID: <20070307224915.GG5956@elf.ucw.cz>
Date:	Wed, 7 Mar 2007 23:49:15 +0100
From:	Pavel Machek <pavel@....cz>
To:	Vivek Goyal <vgoyal@...ibm.com>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Reloc Kernel List <fastboot@...ts.osdl.org>,
	ebiederm@...ssion.com, akpm@...ux-foundation.org, ak@...e.de,
	hpa@...or.com, magnus.damm@...il.com, lwang@...hat.com,
	dzickus@...hat.com, rjw@...k.pl
Subject: Re: [PATCH 16/20] swsusp: do not use virt_to_page on kernel data address

Hi!

> o virt_to_page() call should be used on kernel linear addresses and not
>   on kernel text and data addresses. Swsusp code uses it on kernel data
>   (statically allocated swsusp_header).
> 
> o Allocate swsusp_header dynamically so that virt_to_page() can be used
>   safely.
> 
> o I am changing this because in next few patches, __pa() on x86_64 will
>   no longer support kernel text and data addresses and hibernation breaks. 
> 
> Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>

> +static int swsusp_header_init(void)
> +{
> +	swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
> +	if (!swsusp_header)
> +		panic("Could not allocate memory for swsusp_header\n");
> +	return 0;
> +}
> +
> +core_initcall(swsusp_header_init);

I do not like the panic, but I guess it is okay as we are running
during boot? (Could you add a comment?) Otherwise ok.

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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