linux-kernel - Re: [PATCH v4 10/14] s390: Add support for suppressing warning backtraces

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Message-Id: <a6f90bdb-8459-4d33-8874-7e724bd22d9f@app.fastmail.com>
Date: Fri, 21 Mar 2025 18:33:19 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Guenter Roeck" <linux@...ck-us.net>,
 "Alessandro Carminati" <acarmina@...hat.com>, linux-kselftest@...r.kernel.org
Cc: "Dave Airlie" <airlied@...il.com>,
 Maíra Canal <mcanal@...lia.com>,
 "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Kees Cook" <keescook@...omium.org>,
 Daniel Díaz <daniel.diaz@...aro.org>,
 "David Gow" <davidgow@...gle.com>,
 "Arthur Grillo" <arthurgrillo@...eup.net>,
 "Brendan Higgins" <brendan.higgins@...ux.dev>,
 "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "Maxime Ripard" <mripard@...nel.org>,
 Ville Syrjälä <ville.syrjala@...ux.intel.com>,
 "Daniel Vetter" <daniel@...ll.ch>,
 "Thomas Zimmermann" <tzimmermann@...e.de>,
 "Alessandro Carminati" <alessandro.carminati@...il.com>,
 "Jani Nikula" <jani.nikula@...el.com>, dri-devel@...ts.freedesktop.org,
 kunit-dev@...glegroups.com, Linux-Arch <linux-arch@...r.kernel.org>,
 linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
 linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
 loongarch@...ts.linux.dev, x86@...nel.org,
 "Linaro Kernel Functional Testing" <lkft@...aro.org>,
 "Heiko Carstens" <hca@...ux.ibm.com>,
 "Vasily Gorbik" <gor@...ux.ibm.com>,
 "Alexander Gordeev" <agordeev@...ux.ibm.com>
Subject: Re: [PATCH v4 10/14] s390: Add support for suppressing warning backtraces

On Fri, Mar 21, 2025, at 18:05, Guenter Roeck wrote:
> On 3/13/25 04:43, Alessandro Carminati wrote:
>
> gcc 10.3.0 and later do not have this problem. I also tried s390 builds 
> with gcc 9.4
> and 9.5 but they both crash for unrelated reasons.
>
> If this is a concern, the best idea I have is to make KUNIT_SUPPRESS_BACKTRACE
> depend on, say,
> 	depends on CC_IS_CLANG || (CC_IS_GCC && GCC_VERSION >= 100300)
>
> A more complex solution might be to define an architecture flag such
> as HAVE_SUPPRESS_BACKTRACE, make that conditional on the gcc version
> for s390 only, and make KUNIT_SUPPRESS_BACKTRACE depend on it.

That is probably fine, there are very few users on s390 that build
their own kernels, and they likely all have modern compilers anyway.

I should still send a patch to raise the minimum compiler version to
gcc-8.1, but unfortunately that is not enough here.

     Arnd