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Fri, 13 Feb 2026 12:07:25 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 X-ThreadId: A7zn6QNgbkpw Date: Fri, 13 Feb 2026 18:07:04 +0100 From: "Arnd Bergmann" To: "Andrew Morton" , "Arnd Bergmann" Cc: "Johannes Weiner" , "Axel Rasmussen" , "Yuanchu Xie" , "Wei Xu" , "David Hildenbrand (Red Hat)" , "Michal Hocko" , "Qi Zheng" , "Shakeel Butt" , "Lorenzo Stoakes" , "Baolin Wang" , "Kairui Song" , "Davidlohr Bueso" , "Koichiro Den" , "Jiayuan Chen" , "Bertrand Wlodarczyk" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Message-Id: In-Reply-To: <20260213085842.0654f70a73ec05d88908ec25@linux-foundation.org> References: <20260213123902.3466040-1-arnd@kernel.org> <20260213085842.0654f70a73ec05d88908ec25@linux-foundation.org> Subject: Re: [PATCH] mm/vmscan: avoid false-positive -Wuninitialized warning Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 11A0216000F X-Stat-Signature: f3zdocfyidn8uureewomybptxp8j3yxj X-Rspam-User: X-HE-Tag: 1771002448-608889 X-HE-Meta: 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 DBZX8MiN SgyDul/KH7WaaaM286WQ2dzGoaTShSBUqiV0Smgq9svYtATwtjNVBifl2CnT2NUgtkbtUhNnbB9CvtqpQS+PTqfavrwX2ziQwP4qthKiGTZGQhztmnlCPj5BeayDhGCJM+4xv9yiJHlxEbPQfczXtRbkx+NyLzy8HYXTAIFsEY+a09J8Ccpe3jBAxrEKZo7l2/AiF5ll7E6hSVAgBZ45XSu16un47O08DgazLSq/2Sf5jSyro7HnazDegag== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Feb 13, 2026, at 17:58, Andrew Morton wrote: > On Fri, 13 Feb 2026 13:38:56 +0100 Arnd Bergmann wrote: > >> From: Arnd Bergmann >> >> When the -fsanitize=bounds sanitizer is enabled, > > Is this an option in current kernels? Yes, this is CONFIG_UBSAN_ARRAY_BOUNDS. The actual warning only shows up in some configurations with that, so either there is some other dependency, or an element of chance based on gcc optimizations. > Seems a large change just to squish a compiler warning. People might > prefer a simple > > - struct ctrl_pos sp, pv; > + struct ctrl_pos sp, pv = {}; Right, that would clearly also shut up the warning. To me this seems less intuitive without an extra comment, since read_ctrl_pos() is meant to initialize the entire struct, but please pick whichever you find most readable here. Arnd