Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features
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- Subject: Re: [tip:x86/urgent] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features
- From: hpa@xxxxxxxxx
- Date: Sun, 16 Oct 2016 11:42:26 -0700
- Cc: Ingo Molnar <mingo@xxxxxxxxxx>, peterz@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, dave.hansen@xxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, piotr.luc@xxxxxxxxx, luto@xxxxxxxxxx, brgerst@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dvlasenk@xxxxxxxxxx, jpoimboe@xxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <20161016163557.weyfwd4obnk3rh5v@pd.tnic>
- References: <20161012175731.29619-1-piotr.luc@intel.com> <tip-a518dcc82b6162009c8ca3d169fe61c81536ff17@git.kernel.org> <20161016142233.xuqrahty6gcwq7en@pd.tnic> <A31EBDF6-87E7-4857-9E93-CD471BA7C5C0@zytor.com> <20161016163557.weyfwd4obnk3rh5v@pd.tnic>
- User-agent: K-9 Mail for Android
On October 16, 2016 9:35:57 AM PDT, Borislav Petkov <bp@xxxxxxxxx> wrote:
>On Sun, Oct 16, 2016 at 09:02:51AM -0700, hpa@xxxxxxxxx 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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