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Thu, 17 Sep 2026 09:44:25 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 X-ThreadId: ACGBcqtoOIMw Date: Thu, 17 Sep 2026 15:44:05 +0200 From: "Arnd Bergmann" To: "Andrew Morton" Cc: "Arnd Bergmann" , "Johannes Weiner" , "David Hildenbrand (Red Hat)" , "Michal Hocko" , "Qi Zheng" , "Shakeel Butt" , "Lorenzo Stoakes" , "Kairui Song" , "Barry Song" , "Axel Rasmussen" , "Yuanchu Xie" , "Wei Xu" , "Baoquan He" , "Baolin Wang" , "Ridong Chen" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Message-Id: In-Reply-To: References: <20260916083456.4136132-1-arnd@kernel.org> <20260916162816.39f0f33f6a48d30a71be3575@linux-foundation.org> <20260916163044.3daa3811d9b2bf7d958f1f27@linux-foundation.org> <75939625-482c-464f-83fb-fa12d3e1d79c@app.fastmail.com> <20260916230330.f0923cdb679de0b39d1c5d3a@linux-foundation.org> Subject: Re: [PATCH] mm/vmscan: avoid false-positive -Wuninitialized warning, again Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 9CB9880004 X-Stat-Signature: jecexee81idg5qdh6txfrdsixrpoaqmc X-Rspam-User: X-HE-Tag: 1789652676-210293 X-HE-Meta: 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 AmVrdfi2 OSeYGRTtZqNUMHJk3rn5te8pjWBJSGQJdGZGXFA4qG/yArrIxfKoDLLSvTJccOAJw6wmQQ8fU7GhQItTGRuQRPqABdLeu6C8MspPuHAzeLG7RD5yX1Oc1E3ZsmQuDuf1rBUqmg+wcNqDBqCx3iwQ14PxnpWgiga9+Xwri1CSDCNgiNoQYPG3DqhyEZow2JSVPaSQkuvPyMwt754hTvREzIkcqLUnJqqGwSpr4hDQX+88tRpJdcac2hvpHSMwQbf+5Mo35JPLDJinqOv/oswgpJIWX2K5vy7LZ3d/mR1W+dYJGJ0CeFdvGMP81Ag== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Sep 17, 2026, at 12:15, Arnd Bergmann wrote: > On Thu, Sep 17, 2026, at 08:03, Andrew Morton wrote: > I also managed to create a reduced test case, see > https://godbolt.org/z/xofecssz4 but this still doesn't make sense > to me. I do see that gcc creates a both an out-of-line version > of read_ctrl_pos() and also inlines it. Marking it either > __always_inline or noinline avoids the warning. I now reported this as a gcc bug at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127454 Let's see what they think. Arnd