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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887e829c43sm541202825e9.5.2026.04.07.08.08.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Apr 2026 08:08:11 -0700 (PDT) Date: Tue, 7 Apr 2026 16:08:09 +0100 From: David Laight To: Steven Rostedt Cc: Tamir Duberstein , Petr Mladek , Andy Shevchenko , 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: <20260407160809.48d5fe2a@pumpkin> In-Reply-To: <20260406123232.3dacbe94@gandalf.local.home> References: <20260405-printf-test-old-gcc-v1-1-76d24d9bb60e@kernel.org> <20260406111531.779571d7@gandalf.local.home> <20260406123232.3dacbe94@gandalf.local.home> 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 Mon, 6 Apr 2026 12:32:32 -0400 Steven Rostedt wrote: > On Mon, 6 Apr 2026 11:21:39 -0400 > Tamir Duberstein wrote: > > > Thanks Steve. IMO that is a very big hammer and not warranted in this > > case. There's been talk of encouraging distros to enable CONFIG_KUNIT > > by default [0], which would probably interact poorly with the change > > you propose. > > > > Branch profiling is really just a niche that is enabled specifically for > seeing all branches taken in the kernel. It hooks to all "if" statements! > As you can imagine, it causes a rather large overhead in performance. > > This option is only used by developers doing special analysis of their code > (namely me ;-). Is there any way to stop randconfig picking up options like these? It is rather a waste of brain-cycles trying to fix them. If you want the option to test a specific bit of code it is easy to hack/disable any problematic parts. Even having the KASAN/KMSAN code compiled into allmodconfig is a PITA when you are trying to check that code compiles to something sensible. David