linux-kernel - Re: [PATCH v3 2/5] acpi, apei, ghes: Introduce ARCH_HAS_ACPI_APEI_NMI to make NMI error notification a GHES feature.

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Date:	Tue, 24 Jun 2014 11:00:52 +0200
From:	Tomasz Nowicki <tomasz.nowicki@...aro.org>
To:	Borislav Petkov <bp@...en8.de>
CC:	rjw@...ysocki.net, lenb@...nel.org, tony.luck@...el.com,
	m.chehab@...sung.com, bp@...e.de, linux-edac@...r.kernel.org,
	x86@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	rric@...nel.org
Subject: Re: [PATCH v3 2/5] acpi, apei, ghes: Introduce ARCH_HAS_ACPI_APEI_NMI
 to make NMI error notification a GHES feature.



On 19.06.2014 16:27, Borislav Petkov wrote:
> On Fri, Jun 13, 2014 at 01:02:57PM +0200, Tomasz Nowicki wrote:
>> Currently APEI depends on x86 architecture. It is because of NMI hardware
>> error notification of GHES which is currently supported by x86 only.
>> However, many other APEI features can be still used perfectly by other
>> architectures.
>>
>> This commit adds ARCH_HAS_ACPI_APEI_NMI which will be used in next patches
>> for NMI related code isolation in ghes.c file. Only NMI error notification
>> feature depends on x86 so let it be hard selected for x86 arch.
>>
>> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
>> ---
>>   arch/x86/Kconfig          |    1 +
>>   drivers/acpi/apei/Kconfig |    8 +++++++-
>>   2 files changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 3fc9b12..e1dc819 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -24,6 +24,7 @@ config X86
>>   	select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
>>   	select ARCH_MIGHT_HAVE_PC_PARPORT
>>   	select ARCH_MIGHT_HAVE_PC_SERIO
>> +	select ARCH_HAS_ACPI_APEI_NMI
>>   	select HAVE_AOUT if X86_32
>>   	select HAVE_UNSTABLE_SCHED_CLOCK
>>   	select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
>> diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
>> index c4dac71..9f6c3ec 100644
>> --- a/drivers/acpi/apei/Kconfig
>> +++ b/drivers/acpi/apei/Kconfig
>> @@ -3,7 +3,6 @@ config ACPI_APEI
>>   	select MISC_FILESYSTEMS
>>   	select PSTORE
>>   	select UEFI_CPER
>> -	depends on X86
>
> Now this can practically be enabled on any architecture, AFAICT. Which
> is wrong.
>
> I think a better solution would be to have another HAVE_ symbol which
> each arch which sports APEI selects. Like in the diff below ontop of
> this patch, also incorporating Robert's comments.
>
> You'll have to do select HAVE_ACPI_APEI on arm too.
>
> Hmm?
>

Now that it turns out we have to provide at least tlb_flush_... arch 
function, APEI can not be selected by any architecture. So you are right 
I will introduce HAVE_ACPI_APEI in next version of patches. Thanks.

Tomasz
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