linux-kernel - Re: [PATCH v4 00/16] x86-64: Stack protector and percpu improvements

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Date: Mon, 25 Mar 2024 16:26:40 +0100
From: Takashi Iwai <tiwai@...e.de>
To: "Arnd Bergmann" <arnd@...db.de>
Cc: "Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Brian Gerst" <brgerst@...il.com>,
	"Uros Bizjak" <ubizjak@...il.com>,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	"Ingo Molnar" <mingo@...nel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Borislav Petkov" <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	mwilck@...e.com,
	tiwai@...e.de,
	vbabka@...e.cz,
	denis.kirjanov@...e.com,
	nmorey@...e.com
Subject: Re: [PATCH v4 00/16] x86-64: Stack protector and percpu improvements

On Mon, 25 Mar 2024 15:51:30 +0100,
Arnd Bergmann wrote:
> 
> On Sat, Mar 23, 2024, at 18:06, Linus Torvalds wrote:
> > On Sat, 23 Mar 2024 at 09:16, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > The SLES situation seems somewhat similar, with SLES12 being 4.8.x and
> > SLES15 being 7.3. But again with a "Development Tools Module" setup.
> > So that *might* argue for 7.3.
> 
> According to https://distrowatch.com/table.php?distribution=sle, they
> also provide gcc-12.2.1 with the sp5 update, so we're probably fine.
> 
> On the other hand, I can see that OpenSUSE Leap 15.6 contains
> a fairly modern kernel (6.4.x) built with the gcc-7.3 system
> compiler, and I think this is the same one as in SLES.
> 
> Not sure if they plan to update the kernel release beyond that,
> or how inconvenient it would be for them to require
> using the other compiler for future updates, so I've added
> the developers that last touched the OpenSUSE kernel RPM
> package to Cc here.

SLE15-SP6 kernel (based on 6.4.x) is still built with gcc7, currently
gcc 7.5, indeed.  openSUSE Leap shares the very same kernel, so it's
with gcc 7.5, too.  Even though gcc-13 is provided as additional
compiler package, it's not used for the kernel package build.

AFAIK, it's not decided yet about SP7 kernel.  But since we take a
conservative approach for SLE, I guess SLE15-SP7 will be likely
sticking with the old gcc, unless forced to change by some reason.

SLE12 is built with the old gcc 4.8, and SLE12-SP5 (based on 4.12) is
still actively maintained, but only for a few months until October
2024.

The next generation of SLE is built with the latest gcc (gcc-13 for
now).  So SLE16 will be a totally different story.

openSUSE Tumbleweed always uses a bleeding edge compiler (gcc-13),
too.

Takashi