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Fri, 21 Mar 2025 13:33:41 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: T46bf3c12e1d9de2d Date: Fri, 21 Mar 2025 18:33:19 +0100 From: "Arnd Bergmann" To: "Guenter Roeck" , "Alessandro Carminati" , linux-kselftest@vger.kernel.org Cc: "Dave Airlie" , =?UTF-8?Q?Ma=C3=ADra_Canal?= , "Dan Carpenter" , "Kees Cook" , =?UTF-8?Q?Daniel_D=C3=ADaz?= , "David Gow" , "Arthur Grillo" , "Brendan Higgins" , "Naresh Kamboju" , "Maarten Lankhorst" , "Andrew Morton" , "Maxime Ripard" , =?UTF-8?Q?Ville_Syrj=C3=A4l=C3=A4?= , "Daniel Vetter" , "Thomas Zimmermann" , "Alessandro Carminati" , "Jani Nikula" , dri-devel@lists.freedesktop.org, kunit-dev@googlegroups.com, Linux-Arch , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, loongarch@lists.linux.dev, x86@kernel.org, "Linaro Kernel Functional Testing" , "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" Message-Id: In-Reply-To: References: <20250313114329.284104-1-acarmina@redhat.com> <20250313114329.284104-11-acarmina@redhat.com> Subject: Re: [PATCH v4 10/14] s390: Add support for suppressing warning backtraces Content-Type: text/plain Content-Transfer-Encoding: 7bit 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