linux-kernel - Re: [PATCH V7 3/5] arm64: mm: add PROT_DEVICE_nGnRnE and PROT_NORMAL

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Date:	Fri, 24 Jul 2015 17:26:54 +0100
From:	Will Deacon <will.deacon@....com>
To:	Catalin Marinas <Catalin.Marinas@....com>
Cc:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
	"fu.wei@...aro.org" <fu.wei@...aro.org>,
	"al.stone@...aro.org" <al.stone@...aro.org>,
	"bp @ alien8 . de Matt Fleming" <matt.fleming@...el.com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH V7 3/5] arm64: mm: add PROT_DEVICE_nGnRnE and
 PROT_NORMAL_WT

On Fri, Jul 24, 2015 at 05:15:00PM +0100, Catalin Marinas wrote:
> On Tue, Jul 21, 2015 at 10:59:18PM +0100, Jonathan (Zhixiong) Zhang wrote:
> >  	 *
> >  	 *   n = AttrIndx[2:0]
> >  	 *			n	MAIR
> > @@ -303,12 +303,14 @@ ENTRY(__cpu_setup)
> >  	 *   DEVICE_GRE		010	00001100
> >  	 *   NORMAL_NC		011	01000100
> >  	 *   NORMAL		100	11111111
> > +	 *   NORMAL_WT		101	10111011
> 
> I don't think the write allocation hint makes much sense for WT memory
> (though it shouldn't cause issues either). Just use 10101010.

The EFI spec actually specifies the 1011 1011 encoding, so I think we should
follow that.

Will
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