linux-kernel - Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v7

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Date:	Tue, 29 Apr 2008 03:56:48 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Gabriel C" <nix.or.die@...glemail.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Mika Fischer" <mika.fischer@...pnet.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v7

On Tue, Apr 29, 2008 at 3:30 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
> On Tue, Apr 29, 2008 at 2:47 AM, Gabriel C <nix.or.die@...glemail.com> wrote:
>  > Yinghai Lu wrote:
>  >  > some BIOS like to use continus MTRR layout, and may 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()
>  >  > v4: correct warning mask.
>  >  > v5: CONFIG_MTRR_SANITIZER
>  >  > v6: fix 1g, 2g, 512 aligment with extra hole
>  >  > v7: gran_sizek to prevent running out of MTRRs.
>  >  >
>  >
>  >  With this version ( and patch http://lkml.org/lkml/2008/4/29/97 ) applyed on latest linus git tree
>  >  the box OOPS'es early.
>  >
>  >  Sorry I don't have time right now to write down the part of the OOPS I can see on monitor , I can try to find
>  >  some time later.
>  >
>  >  In any way OOPS'es on __free_one_page+0x191/0x21e
>
>  thanks. found one problem with hole_basek ...
>
>  will send you v8, and hope it will be last version.

please try v8, it should get rid of the 8m entry. it need patch
http://lkml.org/lkml/2008/4/29/97 too.

Thanks

Yinghai Lu
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