From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH RFC 1/2] xen: refactor physical address
 space compression support into common code
Date: Thu, 07 Aug 2014 16:56:00 +0100
Message-ID: <53E3A190.4050409@linaro.org>
References: <E1XCo59-0002Jo-Ge@lists.xen.org>
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To: Ian Campbell <ian.campbell@citrix.com>, xen-devel@lists.xen.org
Cc: Roy Franz <roy.franz@linaro.org>, tim@xen.org, Fu Wei <fu.wei@linaro.org>, Jan Beulich <JBeulich@suse.com>, stefano.stabellini@eu.citrix.com
List-Id: xen-devel@lists.xenproject.org

Hi Ian,

On 07/31/2014 12:01 PM, Ian Campbell wrote:
> diff --git a/xen/include/xen/pdx.h b/xen/include/xen/pdx.h
> new file mode 100644
> index 0000000..bcda9e6
> --- /dev/null
> +++ b/xen/include/xen/pdx.h
> @@ -0,0 +1,47 @@
> +#ifndef __XEN_PDX_H__
> +#define __XEN_PDX_H__
> +
> +#ifdef HAS_PDX
> +
> +extern unsigned long max_pdx;
> +extern unsigned long pfn_pdx_bottom_mask, ma_va_bottom_mask;
> +extern unsigned int pfn_pdx_hole_shift;
> +extern unsigned long pfn_hole_mask;
> +extern unsigned long pfn_top_mask, ma_top_mask;
> +
> +#define PDX_GROUP_COUNT ((1 << PDX_GROUP_SHIFT) / \
> +                         (sizeof(*frame_table) & -sizeof(*frame_table)))
> +extern unsigned long pdx_group_valid[];
> +
> +extern void set_pdx_range(unsigned long smfn, unsigned long emfn);
> +
> +#define page_to_pdx(pg)  ((pg) - frame_table)
> +#define pdx_to_page(pdx) (frame_table + (pdx))
> +
> +extern int __mfn_valid(unsigned long mfn);
> +
> +static inline unsigned long pfn_to_pdx(unsigned long pfn)
> +{
> +    return (pfn & pfn_pdx_bottom_mask) |
> +           ((pfn & pfn_top_mask) >> pfn_pdx_hole_shift);
> +}
> +
> +static inline unsigned long pdx_to_pfn(unsigned long pdx)
> +{
> +    return (pdx & pfn_pdx_bottom_mask) |
> +           ((pdx << pfn_pdx_hole_shift) & pfn_top_mask);
> +}
> +
> +extern void pfn_pdx_hole_setup(unsigned long);
> +
> +#endif /* HAVE_PDX */
> +#endif /* __XEN_PAGING_H__ */

NIT: I think the comment should be /* __XEN_PDX_H__ */

Regards,

-- 
Julien Grall