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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <b969cff5-be11-4fd3-8356-95185ea5de4c@suse.com>
Date: Tue, 16 Dec 2025 14:55:54 +0100
From: Jürgen Groß <jgross@...e.com>
To: 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>,
 "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()

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

Download attachment "OpenPGP_0xB0DE9DD628BF132F.asc" of type "application/pgp-keys" (3684 bytes)

Download attachment "OpenPGP_signature.asc" of type "application/pgp-signature" (496 bytes)