linux-kernel - Re: [patch 5/9] x86: Cure per CPU madness on UP

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Date: Fri, 15 Mar 2024 18:23:12 -0700
From: Linus Torvalds <torvalds@...uxfoundation.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Guenter Roeck <linux@...ck-us.net>, LKML <linux-kernel@...r.kernel.org>, x86@...nel.org, 
	Uros Bizjak <ubizjak@...il.com>, linux-sparse@...r.kernel.org, lkp@...el.com, 
	oe-kbuild-all@...ts.linux.dev, Arnd Bergmann <arnd@...nel.org>
Subject: Re: [patch 5/9] x86: Cure per CPU madness on UP

On Fri, 15 Mar 2024 at 18:11, Thomas Gleixner <tglx@...utronix.de> wrote:
>
> You wish. We still support 486 and some of the still produced 486 clones
> do not have a local APIC.

Ouch. I was _sure_ we had dropped i486 support too due to cmpxchg8b.

But apparently that was just a discussion, and my wishful thinking,
and we never actually followed through.

         Linus