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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488c530910csm19148255e9.2.2026.04.08.05.12.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2026 05:12:30 -0700 (PDT) Date: Wed, 8 Apr 2026 13:12:27 +0100 From: David Laight To: Andy Shevchenko Cc: Petr Mladek , Steven Rostedt , Tamir Duberstein , Rasmus Villemoes , Sergey Senozhatsky , linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel test robot Subject: Re: [PATCH] printf: mark errptr() noinline Message-ID: <20260408131227.0824c330@pumpkin> In-Reply-To: References: <20260405-printf-test-old-gcc-v1-1-76d24d9bb60e@kernel.org> <20260406111531.779571d7@gandalf.local.home> <20260406123232.3dacbe94@gandalf.local.home> <20260407160809.48d5fe2a@pumpkin> <20260408100425.7231966a@pumpkin> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 8 Apr 2026 14:29:59 +0300 Andy Shevchenko wrote: > On Wed, Apr 08, 2026 at 10:04:25AM +0100, David Laight wrote: > > On Wed, 8 Apr 2026 09:24:58 +0200 > > Petr Mladek wrote: > > > On Tue 2026-04-07 16:08:09, David Laight wrote: > > > > On Mon, 6 Apr 2026 12:32:32 -0400 > > > > Steven Rostedt wrote: > > > > > On Mon, 6 Apr 2026 11:21:39 -0400 > > > > > Tamir Duberstein wrote: > > ... > > > > > Even having the KASAN/KMSAN code compiled into allmodconfig is a PITA > > > > when you are trying to check that code compiles to something sensible. > > > > > > This does not look like a good idea. KASAN/KMSAN are very useful > > > features. People will want to keep them working. Removing them from > > > randconfig would just postpone detection of the problem. We would > > > need to deal with it sooner or later anyway. > > > > True, but when I build an allmodconfig build to check how the asm looks > > I really don't want them. > > Isn't easy to disable that in the command line to `make`? It is a config option, and I think you need to reset it every time you rerun 'make allmodconfig' to pick up config changes. You can enable -Werror with W=e, but not disable it if you want to set W=1. I did have a patch that let you use W=1-e which is useful. David > > > For the 'bot' builds you also want to know whether they are defined. > > Changes to how things are built rather than what is built can throw > > up unexpected warnings that are very hard to pin down. > > > > It is bad enough finding things that affect one obscure architecture > > with a specific compiler version when the compiler just makes slightly > > different decisions, without having unusual compilation/config options > > is the mix to muddy the waters further. >