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Date: Tue, 30 Apr 2024 15:15:47 +0200 (CEST)
From: Michael Matz <matz@suse.de>
To: Jiri Slaby <jirislaby@kernel.org>
cc: Borislav Petkov <bp@alien8.de>, Ard Biesheuvel <ardb+git@google.com>, 
    linux-kernel@vger.kernel.org, x86@kernel.org, 
    Ard Biesheuvel <ardb@kernel.org>, Nathan Chancellor <nathan@kernel.org>, 
    Nick Desaulniers <ndesaulniers@google.com>, 
    Bill Wendling <morbo@google.com>, Justin Stitt <justinstitt@google.com>, 
    Song Liu <song@kernel.org>, Ricardo Ribalda <ribalda@kernel.org>, 
    Fangrui Song <maskray@google.com>, Arthur Eubanks <aeubanks@google.com>, 
    stable@vger.kernel.org
Subject: Re: [PATCH] x86/purgatory: Switch to the position-independent small
 code model
In-Reply-To: <4ce6cf96-685d-4792-b2fd-949c07eff707@kernel.org>
Message-ID: <5199b4f0-b4c7-5ef4-e8b7-0ade7c533edd@suse.de>
References: <20240418201705.3673200-2-ardb+git@google.com> <3f23b551-4815-4a06-9217-ff5beeb80df2@kernel.org> <20240420131717.GAZiPAXY9EAYnHajaw@fat_crate.local> <836c267f-a028-acce-8b19-180162a5febc@suse.de>
 <4ce6cf96-685d-4792-b2fd-949c07eff707@kernel.org>
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Hello,

On Tue, 30 Apr 2024, Jiri Slaby 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,
> 
> Of course you do :).

:-P

> That bsc#1211853 I linked earlier. I.e. gcc-13 +
> -fstrict-flex-arrays=3 + -mcmodel=large + some asm() expecting __FILE__ to be
> constant (not true with the large model).

"asm() expecting $whatever" - clearly a user problem, not a GCC problem 
;-)


Ciao,
Michael.