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

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Message-ID: <20150727102245.GC29945@e104818-lin.cambridge.arm.com>
Date:	Mon, 27 Jul 2015 11:22:45 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	"Zhang, Jonathan Zhixiong" <zjzhang@...eaurora.org>
Cc:	Will Deacon <Will.Deacon@....com>,
	"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 08:02:44PM +0100, Zhang, Jonathan Zhixiong wrote:
> On 7/24/2015 9:15 AM, Catalin Marinas wrote:
> > On Tue, Jul 21, 2015 at 10:59:18PM +0100, Jonathan (Zhixiong) Zhang wrote:
> >>   #define PROT_SECT_DEVICE_nGnRE	(PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
> >> diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
> >> index 838266f5b056..23e265d732f8 100644
> >> --- a/arch/arm64/mm/proc.S
> >> +++ b/arch/arm64/mm/proc.S
> >> @@ -294,7 +294,7 @@ ENTRY(__cpu_setup)
> >>   	msr	cpacr_el1, x0			// Enable FP/ASIMD
> >>   	msr	mdscr_el1, xzr			// Reset mdscr_el1
> >>   	/*
> >> -	 * Memory region attributes for LPAE:
> >> +	 * Memory region attributes for LPAE and EFI:
> >
> > LPAE refers to the page table format, the comment probably inherited
> > from arch/arm. EFI means a completely different thing, so please remove
> > it.
> Yes, it was inherited from arch/arm/mm/proc-v7-3level.S. I'll remove
> the change. That being said, the original statement is not totally
> accurate I think, so if you prefer, I could change it like following.
> -	 * Memory region attributes for LPAE:
> +	 * Set MAIR with memory region attributes:

The LPAE is not inaccurate, just superfluous (since that's the only
format supported by AArch64).

-- 
Catalin

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