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

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Date:	Thu, 8 Mar 2007 10:47:30 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	Pavel Machek <pavel@....cz>
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

On Wed, Mar 07, 2007 at 11:49:15PM +0100, Pavel Machek wrote:
> 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.
> 

Hi Pavel,

Yes, it is an initcall and this memory page will be allocated during
boot time. Not very sure what comment to put there. To me it seems
pretty obivious with "core_initcall".

Thanks
Vivek
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