linux-kernel - Re: [PATCH 2/3] x86: Enable PAT to use cache mode translation tables

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Message-ID: <1409268069.28990.120.camel@misato.fc.hp.com>
Date:	Thu, 28 Aug 2014 17:21:09 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Juergen Gross <jgross@...e.com>
Cc:	stefan.bader@...onical.com, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, konrad.wilk@...cle.com,
	ville.syrjala@...ux.intel.com, hpa@...or.com, x86@...nel.org
Subject: Re: [PATCH 2/3] x86: Enable PAT to use cache mode translation tables

On Tue, 2014-08-26 at 08:16 +0200, Juergen Gross wrote:
> Update the translation tables from cache mode to pgprot values according to
> the PAT settings. This enables changing the cache attributes of a PAT index in
> just one place without having to change at the users side.
> 
> With this change it is possible to use the same kernel with different PAT
> configurations, e.g. supporting Xen.
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>

I know I sent my review-by before, but my build test failed...

> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 8981cc8..d7bf551 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1574,6 +1574,7 @@ extern void free_area_init(unsigned long * zones_size);
>  extern void free_area_init_node(int nid, unsigned long * zones_size,
>  		unsigned long zone_start_pfn, unsigned long *zholes_size);
>  extern void free_initmem(void);
> +extern void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache);

This new interface cannot be defined in this common header file since
page_cache_mode is only defined in x86.  It should be defined in x86
header, such as pat.h.

Thanks,
-Toshi


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