linux-kernel - Re: [PATCH 1/2] arm64/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE

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Message-Id: <15c56137-e7c4-dbfa-ce5d-f5feeea79e98@linux.vnet.ibm.com>
Date:   Wed, 2 May 2018 11:00:55 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     Ganesh Mahendran <opensource.ganesh@...il.com>,
        catalin.marinas@....com, will.deacon@....com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 1/2] arm64/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT

On 02/05/2018 09:54, Ganesh Mahendran wrote:
> Set ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT for arm64. This
> enables Speculative Page Fault handler.
> 
> Signed-off-by: Ganesh Mahendran <opensource.ganesh@...il.com>
> ---
> This patch is on top of Laurent's v10 spf
> ---
>  arch/arm64/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index eb2cf49..cd583a9 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -144,6 +144,7 @@ config ARM64
>  	select SPARSE_IRQ
>  	select SYSCTL_EXCEPTION_TRACE
>  	select THREAD_INFO_IN_TASK
> +	select ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT if SMP

There is no need to depend on SMP here as the upper
CONFIG_SPECULATIVE_PAGE_FAULT is depending on SMP.

>  	help
>  	  ARM 64-bit (AArch64) Linux support.
>