linux-kernel - Re: [PATCH -mm 1/2] kexec/i386: kexec page table code clean up

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Date:	Thu, 10 Jan 2008 10:06:11 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 1/2] kexec/i386: kexec page table code clean up -
	add arch_kimage

On Wed, 2008-01-09 at 20:14 -0500, Vivek Goyal wrote:
[...]
> >  
> > +static void alloc_page_tables(struct kimage *image)
> > +{
> 
> This is too generic a name. How about something like
> arch_alloc_kexec_page_tables()

OK, I will change it.

> > +	image->arch_kimage.pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
> > +#ifdef CONFIG_X86_PAE
> > +	image->arch_kimage.pmd0 = (pmd_t *)get_zeroed_page(GFP_KERNEL);
> > +	image->arch_kimage.pmd1 = (pmd_t *)get_zeroed_page(GFP_KERNEL);
> > +#endif
> > +	image->arch_kimage.pte0 = (pte_t *)get_zeroed_page(GFP_KERNEL);
> > +	image->arch_kimage.pte1 = (pte_t *)get_zeroed_page(GFP_KERNEL);
> > +}
> > +
> > +static void free_page_tables(struct kimage *image)
> > +{
> 
> How about arch_free_kexec_page_tables()

OK, I will change it.

> > +	free_page((unsigned long)image->arch_kimage.pgd);
> > +#ifdef CONFIG_X86_PAE
> > +	free_page((unsigned long)image->arch_kimage.pmd0);
> > +	free_page((unsigned long)image->arch_kimage.pmd1);
> > +#endif
> > +	free_page((unsigned long)image->arch_kimage.pte0);
> > +	free_page((unsigned long)image->arch_kimage.pte1);
> > +}
> > +
> >  /*
> >   * A architecture hook called to validate the
> >   * proposed image and prepare the control pages
> > @@ -83,10 +97,21 @@ static void load_segments(void)
> >   * reboot code buffer to allow us to avoid allocations
> >   * later.
> >   *
> > - * Currently nothing.
> > + * - Allocate page tables
> >   */
> >  int machine_kexec_prepare(struct kimage *image)
> >  {
> > +	alloc_page_tables(image);
> > +	if (!image->arch_kimage.pgd ||
> > +#ifdef CONFIG_X86_PAE
> > +	    !image->arch_kimage.pmd0 ||
> > +	    !image->arch_kimage.pmd1 ||
> > +#endif
> > +	    !image->arch_kimage.pte0 ||
> > +	    !image->arch_kimage.pte1) {
> > +		free_page_tables(image);
> > +		return -ENOMEM;
> 
> I think this error handling can be done in alloc_page_tables() itself and
> following will look neater.

OK, I will change it.

Best Regards,
Huang Ying

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