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

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Message-ID: <aUFjRDqbfWMsXvvS@gmail.com>
Date: Tue, 16 Dec 2025 14:48:52 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Jürgen Groß <jgross@...e.com>
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>,
	"H. Peter Anvin" <hpa@...or.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()


* 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. :-)

Whatever side effects it still may have, I very strongly doubt it has
anything to do with the original purpose of IO delays...

> In cases 2-4 I'd still like to have patch 1 of my series applied, as it will
> make paravirt rework easier.

Sure.

Thanks,

	Ingo