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    SubjectRE: [PATCH v2 1/1] arm64: Add workaround for Fujitsu A64FX erratum 010001
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    Hi Catalin,
    > -----Original Message-----
    > From: linux-arm-kernel
    > [mailto:linux-arm-kernel-bounces@lists.infradead.org] On Behalf Of
    > Catalin Marinas
    > Sent: Saturday, January 26, 2019 3:08 AM
    > To: Zhang, Lei/張 雷
    > Cc: 'Mark Rutland'; 'will.deacon@arm.com';
    > 'linux-kernel@vger.kernel.org';
    > 'linux-arm-kernel@lists.infradead.org'
    > Subject: Re: [PATCH v2 1/1] arm64: Add workaround for Fujitsu A64FX
    > erratum 010001
    >
    > IIUC, this can happen very early when the errata framework isn't yet
    > ready. Given that this is not on a fast path (you already took a fault),
    > I don't think it's worth optimising for cpus_have_cap() (and
    > ARM64_WORKAROUND_FUJITSU_A64FX_0100001). I've seen Mark's comments on
    > why checking MIDR in a preemptible context is not a good idea but I
    > suspect your platform is homogeneous (i.e. not big.LITTLE).
    Thanks for comment.
    I will post a new patch to resolve fast path problem in today.
    By the way our platform is homogeneous.


    Best Regards,
    Lei Zhang
    zhang.lei@jp.fujitsu.com



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