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

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Message-ID: <20180502110441.xuvjs7gu5xir6y72@lakrids.cambridge.arm.com>
Date:   Wed, 2 May 2018 12:05:20 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     Ganesh Mahendran <opensource.ganesh@...il.com>,
        catalin.marinas@....com, will.deacon@....com,
        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 Wed, May 02, 2018 at 11:00:55AM +0200, Laurent Dufour wrote:
> 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.

Additionally, since commit:

  4b3dc9679cf77933 ("arm64: force CONFIG_SMP=y and remove redundant #ifdefs")

... arm64 is always SMP.

Thanks,
Mark.