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

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Message-ID: <55B28811.5050600@codeaurora.org>
Date:	Fri, 24 Jul 2015 11:46:41 -0700
From:	"Zhang, Jonathan Zhixiong" <zjzhang@...eaurora.org>
To:	Will Deacon <will.deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>
Cc:	"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 4/5] arm64: apei: implement
 arch_apei_get_mem_attributes()



On 7/24/2015 9:26 AM, Will Deacon wrote:
> On Fri, Jul 24, 2015 at 05:21:49PM +0100, Catalin Marinas wrote:
>> On Fri, Jul 24, 2015 at 03:57:08PM +0100, Will Deacon wrote:
>>> On Tue, Jul 21, 2015 at 10:59:19PM +0100, Jonathan (Zhixiong) Zhang wrote:
>>>> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
>>>> +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;
>>>
>>> Can we not use pgprot_noncached and pgprot_writecombine for these two?
>>
>> Actually, why do we even use pgprot_t for prot here? EFI_MEMORY_* don't
>> have anything to do with the arch-specific pgprot_t.
>
> Good point; the pgprot_t confused me, so my suggestion is much use after
> ll. We're better off with a u64 to avoid further confusion.
Got it. Thanks for the catch, Will/Catalin.

-- 
Jonathan (Zhixiong) Zhang
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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