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Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features

From hpa@zytor.com
Newsgroups linux.kernel
Subject Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features
Date 2016-10-16 20:50 +0200
Message-ID <ssYFs-14v-9@gated-at.bofh.it> (permalink)
References <srw8x-7Wn-3@gated-at.bofh.it> <ssRND-59Z-23@gated-at.bofh.it> <ssUs9-6Vd-1@gated-at.bofh.it> <ssWaB-83K-5@gated-at.bofh.it> <ssWDD-8eT-7@gated-at.bofh.it>
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On October 16, 2016 9:35:57 AM PDT, Borislav Petkov <bp@alien8.de> wrote:
>On Sun, Oct 16, 2016 at 09:02:51AM -0700, hpa@zytor.com wrote:
>> No, please.  That would be worse than the disease.
>
>Why not?
>
>I did that recently with a bunch of leaves and there were no issues:
>
>2ccd71f1b278 ("x86/cpufeature: Move some of the scattered feature bits
>to x86_capability")
>
>There it obviously made sense for 0x00000006 and 0x8000000a to have a
>separate ->x86_capability leaf.

It's needlessly adding complexity for no reason, at least for the leaves that are going to add bits over time.  The x86_capability array is not an expensive resource.
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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Thread

[tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features tip-bot for Piotr Luc <tipbot@zytor.com> - 2016-10-16 13:30 +0200
  Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features Borislav Petkov <bp@alien8.de> - 2016-10-16 16:20 +0200
    Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features hpa@zytor.com - 2016-10-16 18:10 +0200
      Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features Borislav Petkov <bp@alien8.de> - 2016-10-16 18:40 +0200
        Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features hpa@zytor.com - 2016-10-16 20:50 +0200
          Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features Borislav Petkov <bp@alien8.de> - 2016-10-17 00:40 +0200
            Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-17 12:00 +0200
    Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS  features Thomas Gleixner <tglx@linutronix.de> - 2016-10-17 10:00 +0200
      Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-17 10:30 +0200
        Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features Ingo Molnar <mingo@kernel.org> - 2016-10-17 10:50 +0200
          Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-17 12:00 +0200
            Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS  features Thomas Gleixner <tglx@linutronix.de> - 2016-10-17 12:00 +0200
              [PATCH v2] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features. Piotr Luc <piotr.luc@intel.com> - 2016-10-17 17:10 +0200
                Re: [v2] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS  features. "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-18 15:10 +0200
                Re: [v2] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS  features. Ingo Molnar <mingo@kernel.org> - 2016-10-18 15:10 +0200
                [PATCH v3] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features. Piotr Luc <piotr.luc@intel.com> - 2016-10-18 17:10 +0200
                [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and  AVX512_4FMAPS features tip-bot for Piotr Luc <tipbot@zytor.com> - 2016-10-19 17:50 +0200

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