linux-kernel - Re: [PATCH v9 2/10] x86, mm, pat: Change reserve

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Message-ID: <alpine.DEB.2.11.1505220901210.5457@nanos>
Date:	Fri, 22 May 2015 09:01:34 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Toshi Kani <toshi.kani@...com>
cc:	hpa@...or.com, mingo@...hat.com, akpm@...ux-foundation.org,
	arnd@...db.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, linux-nvdimm@...1.01.org, jgross@...e.com,
	stefan.bader@...onical.com, luto@...capital.net, hmh@....eng.br,
	yigal@...xistor.com, konrad.wilk@...cle.com, Elliott@...com,
	mcgrof@...e.com, hch@....de
Subject: Re: [PATCH v9 2/10] x86, mm, pat: Change reserve_memtype() for WT

On Wed, 13 May 2015, Toshi Kani wrote:

> This patch changes reserve_memtype() to support the WT cache mode
> with PAT.  When PAT is not enabled, WB and UC- are the only types
> supported.
> 
> When a target range is in RAM, reserve_ram_pages_type() verifies
> the requested type.  reserve_ram_pages_type() is changed to fail
> WT and WP requests with -EINVAL since set_page_memtype() is
> limited to handle three types, WB, WC and UC-.
> 
> Signed-off-by: Toshi Kani <toshi.kani@...com>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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