linux-kernel - Re: [PATCH 0/5] x86: Cleanups around slow_down

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Message-ID: <14EF14B1-8889-4037-8E7B-C8446299B1E9@zytor.com>
Date: Tue, 16 Dec 2025 07:32:09 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Jürgen Groß <jgross@...e.com>,
        Ingo Molnar <mingo@...nel.org>
CC: linux-kernel@...r.kernel.org, x86@...nel.org,
        virtualization@...ts.linux.dev, kvm@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-block@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ajay Kaher <ajay.kaher@...adcom.com>,
        Alexey Makhalov <alexey.makhalov@...adcom.com>,
        Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>, Denis Efremov <efremov@...ux.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 0/5] x86: Cleanups around slow_down_io()

On December 16, 2025 5:55:54 AM PST, "Jürgen Groß" <jgross@...e.com> wrote:
>On 16.12.25 14:48, Ingo Molnar wrote:
>> 
>> * Jürgen Groß <jgross@...e.com> wrote:
>> 
>>>> CPUs anymore. Should it cause any regressions, it's easy to bisect to.
>>>> There's been enough changes around all these facilities that the
>>>> original timings are probably way off already, so we've just been
>>>> cargo-cult porting these to newer kernels essentially.
>>> 
>>> Fine with me.
>>> 
>>> Which path to removal of io_delay would you (and others) prefer?
>>> 
>>> 1. Ripping it out immediately.
>> 
>> I'd just rip it out immediately, and see who complains. :-)
>
>I figured this might be a little bit too evil. :-)
>
>I've just sent V2 defaulting to have no delay, so anyone hit by that
>can still fix it by applying the "io_delay" boot parameter.
>
>I'll do the ripping out for kernel 6.21 (or whatever it will be called).
>
>
>Juergen

Ok, I'm going to veto ripping it out from the real-mode init code, because I actually know why it is there :) ... and that code is pre-UEFI legacy these days anyway.

Other places... I don't care :)