linux-kernel - Re: [PATCH v5 28/28] x86/fpu/amx: Clear the AMX state when appropriate

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Date:   Thu, 27 May 2021 10:02:43 -0400
From:   Len Brown <lenb@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        "Brown, Len" <len.brown@...el.com>,
        "Liu, Jing2" <jing2.liu@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [PATCH v5 28/28] x86/fpu/amx: Clear the AMX state when appropriate

On Thu, May 27, 2021 at 7:56 AM Peter Zijlstra <peterz@...radead.org> wrote:

> Why can't this live in intel_idle.c ?

You are right, and that looks reasonable.

I was thinking we'd have to hack mwait_idle_with_hints() used by everybody,
but we could clone intel_idle() above and have a plug in a tweaked version
for AMX hardware.

Len Brown, Intel Open Source Technology Center