From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fhigh-b6-smtp.messagingengine.com (fhigh-b6-smtp.messagingengine.com [202.12.124.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 452CC53ECE3 for ; Thu, 17 Sep 2026 13:44:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.12.124.157 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789652688; cv=none; b=eTQko29O5wvZrcJH1XtrxUG2vklVqth14Mr17xnc8wclIVhGd+xJSULi5NqUukDS3d5IQkUaWgyBND2eKA/37Vky5ldM4gTG+OiiYP9aw+wXErZliZtm40ybeX7AFwn7bO3dUcKoB0f/Z7dMMhRCpa5VXusc+un0bhFl4DVBWn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789652688; c=relaxed/simple; bh=xkT6eoN6SNKXL4VzXso2H312Ve7Wds/u8g2CpTKBkBw=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=nF0IBxhTtoRBag2iR/Y/WomZPP8eiS4QfiLXeYYA/8EftfVwCqroWRsVSWJxuCAgpREBc+VEwuKi+aQvVYRzbStGqiksyvv8jvm9hNqaRGXdgLhIudNkORIdgYweNyPQtqtl2oUT3pjcyRdN+VSi4AXZGka2MlYvKbOiPKV5HEg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arndb.de; spf=pass smtp.mailfrom=arndb.de; dkim=pass (2048-bit key) header.d=arndb.de header.i=@arndb.de header.b=HctIIHov; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=SStFEGzx; arc=none smtp.client-ip=202.12.124.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arndb.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arndb.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=arndb.de header.i=@arndb.de header.b="HctIIHov"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="SStFEGzx" Received: from ams-compute-02.internal (ams-compute-02.internal [10.64.2.62]) by mailfhigh.stl.internal (Postfix) with ESMTP id F249C7A00C5; Thu, 17 Sep 2026 09:44:33 -0400 (EDT) Received: from ams-imap-03 ([10.64.2.23]) by ams-compute-02.internal (MEProxy); Thu, 17 Sep 2026 09:44:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm3; t=1789652673; x=1789739073; bh=tv6AvKyUBKOBYVm3p89JvK4vd3gPLoZ8aFTemFA9YCI=; b= HctIIHovHKiSYvDiERhQbil2j0rxOiLLU1DR3yhzfDgVf8OBAturF4DW+rjA/pvm 2TzLUXFsqesfBe/VzUjY5Ju64T2L/iMnYi4Iad2YoqCjrFCCtJcrFNty7KYaAkMX Ee/ThGhSNY9K8EqUjlX3DBBbEx/iD4zw0n9T1lAR0UcjIAiS2QIu/DGeFtM2gKsx vC1618xkmUgbuhahywNtoXIoFCQd2T41JK7SONpIEAZmn+k+g8Jw5bH1gN58C5uA t8Lr/iqGzj6AwyMMsO2Hr/46k0jobJDn5xUdIBJtFKTOKQynTNruPylRBw3+OFm5 rALKY7nbPduQzYQgGCpRlw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t=1789652673; x= 1789739073; bh=tv6AvKyUBKOBYVm3p89JvK4vd3gPLoZ8aFTemFA9YCI=; b=S StFEGzxtmEHfc/qCz0zCotM/62OuKzHd85UKp5on/sqrapd1073iSGEnIW7cbSU7 x2iYOlCqOJmN9CH8dnJujRjyRNx+0Rb73k/x41hsFYPrlYd2ic888Qg4bHieUev0 3FFiY6py7o5tIBq3fNUbqObBJ50xldle8fiPYdOH+CviFb/BaFBlsuOtg6vFTK5D 5Qr8IGCFMBL7Va8qzEd++eIm+bgE3qiIFyV3deBWLoZagMOgLU+IqfH2zXVZK0sD MxphVkaC4athozVsO406Gkt4RMZ6mI3CfIbWSGKuKSb2IR1EmHhKSgL2cJ3oo/Cw LNnPjasrPOmybL2sjzNEg== X-ME-Sender: X-ME-Proxy-Cause: dmFkZTExMucRjVTWbs21V42SBnhmaV4MID8KsqHtSlc5cs4YSlrkOBHN5kHw1e+1PjA916 9qrZOYYnJrxL7qGwwWQpGSNzj3uskNb1QR5XO03BL513/hPDNlb+fwDHlSeoO/Pnk6whk/ LKQVd28yHC8/KBccPHePZI6mTeqh7yKWU7/09ViA1FxBpR+uoLt/wrYJds6oeJvJ4T29MG ali7NZeCPIsmZJ6nf39KUC39gTsQlaZhWsinf8igZnwI0CQL9I7h460JI5zfd282v19One 8AMUBGUCj/m/2aPL9jLGr34OcqninFy5SCx6sSEPZxU8KripIQ9SH8D3iL5s5EvCzYv8sI wZjcD2Bn7eiQwRwVXeqeR/9N2Y3tP6i9ckJC3pgPUvWLAjUcibwBKHIY8jh4h+xPZzq1nd TPrj0XpO6qnyktQZQKsYUSyo95ZxXoWVkoA7ifbMitPAufHtbx1Z3XLM/j8Q8PglVwx6HD 6GYlJIWjRNmErVFsasLUHAKF94+gS4YDbgUP5MUSiiG2DK2pcD8Zr32GAbYbZMY6aIqxvj DGuJJ9M61UrNiu4+tC5HCX02FO52ZhZpCswYDg3LN86DXC44SZDHIDoIqtdOb2HgBaioMs Mc9xIQ5KTHz6ivWOO1NuhCfGmll1SfbHC98gRcXftXYmOy06u0bj6SjFbNEg X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.ams.internal (Postfix, from userid 501) id 7306C32A0084; Thu, 17 Sep 2026 09:44:25 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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