linux-kernel - Re: [RFC PATCH 0/11] Support Write-Through mapping on x86

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Message-ID: <53C58A9C.6070906@zytor.com>
Date:	Tue, 15 Jul 2014 13:10:04 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Toshi Kani <toshi.kani@...com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	plagnioj@...osoft.com, tomi.valkeinen@...com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefan Bader <stefan.bader@...onical.com>,
	Dave Airlie <airlied@...il.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [RFC PATCH 0/11] Support Write-Through mapping on x86

On 07/15/2014 12:53 PM, Andy Lutomirski wrote:
> 
> Note that MTRRs are already partially deprecated: all drivers *should*
> be using arch_phys_wc_add, not mtrr_add, and arch_phys_wc_add is a
> no-op on systems with working PAT.
> 
> Unfortunately, I never finished excising mtrr_add.  Finishing the job
> wouldn't be very hard.
> 

The use of MTRRs in drivers is separate from the MTRR global setup done
by the firmware, though.

	-hpa


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