linux-kernel - Re: [PATCH] arm64: kconfig: allow support for memory failure handling

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Message-ID: <58D3DCA1.5090006@arm.com>
Date:   Thu, 23 Mar 2017 14:33:05 +0000
From:   James Morse <james.morse@....com>
To:     Punit Agrawal <Punit.Agrawal@....com>
CC:     Tyler Baicar <tbaicar@...eaurora.org>, catalin.marinas@....com,
        will.deacon@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
Subject: Re: [PATCH] arm64: kconfig: allow support for memory failure handling

Hi Punit,

On 01/02/17 21:38, Tyler Baicar wrote:
> From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
> 
> If ACPI_APEI and MEMORY_FAILURE is configured, select
> ACPI_APEI_MEMORY_FAILURE. This enables memory failure recovery
> when such memory failure is reported through ACPI APEI. APEI
> (ACPI Platform Error Interfaces) provides a means for the
> platform to convey error information to the kernel.
> 
> Declare ARCH_SUPPORTS_MEMORY_FAILURE, as arm64 does support
> memory failure recovery attempt.

Am I right in thinking we should wait for the hugepage issue you found with
hwpoison [0] to be fixed before arm64 can have ARCH_SUPPORTS_MEMORY_FAILURE?

(If so, can this patch become part of that series to they are obviously related!)

Thanks,

James

[0] https://www.spinics.net/lists/arm-kernel/msg568995.html




> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index f92778d..4cd12a0 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -15,6 +15,8 @@ config ARM64
>  	select ARCH_HAS_SG_CHAIN
>  	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
>  	select ARCH_USE_CMPXCHG_LOCKREF
> +	select ACPI_APEI_MEMORY_FAILURE if ACPI_APEI && MEMORY_FAILURE
> +	select ARCH_SUPPORTS_MEMORY_FAILURE
>  	select ARCH_SUPPORTS_ATOMIC_RMW
>  	select ARCH_SUPPORTS_NUMA_BALANCING
>  	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
>