linux-kernel - Re: [PATCH v2 2/6] x86, mm, pat: Change reserve

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Message-ID: <5410B10A.4030207@zytor.com>
Date:	Wed, 10 Sep 2014 13:14:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Toshi Kani <toshi.kani@...com>,
	Andy Lutomirski <luto@...capital.net>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Juergen Gross <jgross@...e.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Yigal Korman <yigal@...xistor.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v2 2/6] x86, mm, pat: Change reserve_memtype() to handle
 WT

On 09/10/2014 12:30 PM, Toshi Kani wrote:
> 
> When WT is unavailable due to the PAT errata, it does not fail but gets
> redirected to UC-.  Similarly, when PAT is disabled, WT gets redirected
> to UC- as well.
> 

But on pre-PAT hardware you can still do WT.

	-hpa

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