linux-kernel - Re: [RFC PATCH 02/28] Documentation: Bump minimum GCC version to 8.1

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Message-ID: <Z2QJKZBsgvPMgRo_@J2N7QTR9R3>
Date: Thu, 19 Dec 2024 11:53:13 +0000
From: Mark Rutland <mark.rutland@....com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>, x86@...nel.org,
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Subject: Re: [RFC PATCH 02/28] Documentation: Bump minimum GCC version to 8.1

Hi Arnd,

On Wed, Sep 25, 2024 at 03:58:38PM +0000, Arnd Bergmann wrote:
> On Wed, Sep 25, 2024, at 15:01, Ard Biesheuvel wrote:
> > From: Ard Biesheuvel <ardb@...nel.org>
> >
> > Bump the minimum GCC version to 8.1 to gain unconditional support for
> > referring to the per-task stack cookie using a symbol rather than
> > relying on the fixed offset of 40 bytes from %GS, which requires
> > elaborate hacks to support.
> >
> > Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> > ---
> >  Documentation/admin-guide/README.rst | 2 +-
> >  Documentation/process/changes.rst    | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> Acked-by: Arnd Bergmann <arnd@...db.de>
> 
> As we discussed during plumbers, I think this is reasonable,
> both the gcc-8.1 version and the timing after the 6.12-LTS
> kernel.
> 
> We obviously need to go through all the other version checks
> to see what else can be cleaned up. I would suggest we also
> raise the binutils version to 2.30+, which is what RHEL8
> shipped alongside gcc-8. I have not found other distros that
> use older binutils in combination with gcc-8 or higher,
> Debian 10 uses binutils-2.31.
> I don't think we want to combine the additional cleanup with
> your series, but if we can agree on the version, we can do that
> in parallel.

Were you planning to send patches to that effect, or did you want
someone else to do that? I think we were largely agreed on making those
changes, but it wasn't clear to me who was actually going to send
patches, and I couldn't spot a subsequent thread on LKML.

Mark.