linux-kernel - Re: [PATCH] x86/purgatory: Switch to the position-independent small code model

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Date: Mon, 29 Apr 2024 14:05:12 +0200 (CEST)
From: Michael Matz <matz@...e.de>
To: Borislav Petkov <bp@...en8.de>
cc: Jiri Slaby <jirislaby@...nel.org>, Ard Biesheuvel <ardb+git@...gle.com>, 
    linux-kernel@...r.kernel.org, x86@...nel.org, 
    Ard Biesheuvel <ardb@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
    Nick Desaulniers <ndesaulniers@...gle.com>, 
    Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
    Song Liu <song@...nel.org>, Ricardo Ribalda <ribalda@...nel.org>, 
    Fangrui Song <maskray@...gle.com>, Arthur Eubanks <aeubanks@...gle.com>, 
    stable@...r.kernel.org
Subject: Re: [PATCH] x86/purgatory: Switch to the position-independent small
 code model

Hello,

On Sat, 20 Apr 2024, Borislav Petkov wrote:

> Interesting. I thought gcc doesn't have problems here yet and was
> talking to Matz on Thu about it and it seems he's forgotten about his
> statement too that "you should simply stop using -mcmodel=large.  Noone
> should use it." :-)

It may be so ingrained in my brain that I'm not _always_ saying it when 
talking about the large code model over a beer.  And indeed I know of no 
particular problems with it vis GCC, but that doesn't mean it's a good 
idea to use :-)

So once again: "everyone should simply stop using -mcmodel=large.  Noone 
should use it."

So the patch goes strictly into the direction of betterment of the 
universe. :)

Ciao,
Michael.