linux-kernel - Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v3

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Date:	Mon, 28 Apr 2008 13:18:33 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Gabriel C" <nix.or.die@...glemail.com>,
	"Mika Fischer" <mika.fischer@...pnet.de>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v3

On Mon, Apr 28, 2008 at 1:15 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
>  * Yinghai Lu <yhlu.kernel.send@...il.com> wrote:
>
>  > some BIOS like to use continus MTRR layout, and some X driver can not
>  > add WB entries for graphical cards when 4g or more RAM installed.
>  >
>  > the patch will change MTRR to discrete.
>  >
>  > mtrr_chunk_size= could be used to have smaller continuous block to
>  > hold holes. default is 256m, could be set according to size of
>  > graphics card memory.
>  >
>  > v2: fix -1 for UC checking
>
>  > v3: default to disable, and need use enable_mtrr_cleanup to enable
>  >     this feature
>  >     skip the var state change warning.
>  >     remove next_basek in range_to_mtrr()
>
>  a boot option is often inconvenient though - could you perhaps also make
>  this a Kconfig option, with it defaulting to off? Something like
>  CONFIG_MTRR_SANITIZE=y or so? That way distros can make a conscious
>  decision as well whether they want this feature (for the Xorg they pick)
>  or not.

use disable_mtrr_cleanup and CONFIG_MTRR_SANITIZER?

YH
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