linux-kernel - Re: [PATCH V7 4/5] arm64: apei: implement arch_apei_get_mem

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Date:	Fri, 24 Jul 2015 10:59:20 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
	catalin.marinas@....com, will.deacon@....com, fu.wei@...aro.org,
	al.stone@...aro.org,
	"bp @ alien8 . de Matt Fleming" <matt.fleming@...el.com>,
	rjw@...ysocki.net
CC:	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH V7 4/5] arm64: apei: implement arch_apei_get_mem_attributes()

On 07/22/2015 05:59 AM, Jonathan (Zhixiong) Zhang wrote:
> From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
>
> If the physical address has memory attributes defined by EFI
> memmap as EFI_MEMORY_UC, the page protection type is
> PROT_DEVICE_nGnRE. Otherwise, the page protection type is
> PAGE_KERNEL.

...

[...]
> +#ifdef	CONFIG_ACPI_APEI
> +/*
> + * According to "Table 8 Map: EFI memory types to AArch64 memory types"
> + * of UEFI 2.5 section 2.3.6.1, each EFI memory type is mapped to
> + * corresponding MAIR attribute encoding.
> + */
> +static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
> +{
> +	pgprot_t prot;
> +
> +	prot = efi_mem_attributes(addr);
> +	if (prot & EFI_MEMORY_UC)
> +		return PROT_DEVICE_nGnRnE;
> +	if (prot & EFI_MEMORY_WC)
> +		return PROT_NORMAL_NC;
> +	if (prot & EFI_MEMORY_WT)
> +		return PROT_NORMAL_WT;
> +	return PAGE_KERNEL;
> +}

The change log is not matching the code here, and the PROT_DEVICE_nGnRE
in the change log is wrong, if you fix that,

Acked-by: Hanjun Guo <hanjun.guo@...aro.org>

Thanks
Hanjun

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