linux-kernel - Re: [RFC Patch] use MTRR for write combining if PAT is not available

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Message-Id: <200910111156.54951.thomas.schlichter@web.de>
Date:	Sun, 11 Oct 2009 11:56:54 +0200
From:	Thomas Schlichter <thomas.schlichter@....de>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	Thomas Hellstrom <thellstrom@...are.com>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available

Arjan van de Ven wrote:
> Thomas Schlichter wrote:
> > So, convincing Ubuntu to enable PAT would be a workaround, but I think
> > the problem would still exist and should be fixed.
> 
> I think it's time to get rid of CONFIG_PAT at all.. and just have it be
>  there. Making 10+ year old CPU features that are essential functionality a
>  config option... ... not a good idea to be honest.

I do completely agree with you in this point.

But should the current behavior of not using MTRR for write combining when PAT 
is disabled (for whatever reason) stay? I think it is more consistent to do 
whatever is necessary to enable write combining when we are asked to.

Kind regards,
  Thomas
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