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

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To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Subject: Re: [patch 5/9] x86: Cure per CPU madness on UP
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 15 Mar 2024 18:23:12 -0700
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, Uros Bizjak <ubizjak@xxxxxxxxx>, linux-sparse@xxxxxxxxxxxxxxx, lkp@xxxxxxxxx, oe-kbuild-all@xxxxxxxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxxxx>
In-reply-to: <877ci3j80k.ffs@tglx>
References: <20240303235029.555787150@linutronix.de> <20240304005104.622511517@linutronix.de> <e20d88d0-5fb9-4307-be67-88b04ae9a188@roeck-us.net> <CAHk-=whK=G1o6RtS9DS3wEGF1KU7WLgLL1+6Se86bj8m7wwqrQ@mail.gmail.com> <87y1ajjsv9.ffs@tglx> <87o7bfjeae.ffs@tglx> <CAHk-=wiP+XMGHr8NU13sSOG_oasNZN02O9_c1PzCJNG7+O-GPw@mail.gmail.com> <877ci3j80k.ffs@tglx>

On Fri, 15 Mar 2024 at 18:11, Thomas Gleixner <tglx@xxxxxxxxxxxxx> 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

Follow-Ups:
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Arnd Bergmann

References:
- [patch 0/9] x86: Cure tons of sparse warnings (mostly __percpu)
  - From: Thomas Gleixner
- [patch 5/9] x86: Cure per CPU madness on UP
  - From: Thomas Gleixner
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Guenter Roeck
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Linus Torvalds
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Thomas Gleixner
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Thomas Gleixner
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Linus Torvalds
- Re: [patch 5/9] x86: Cure per CPU madness on UP
  - From: Thomas Gleixner

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