From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 118CF606A31A for ; Tue, 27 Oct 2026 00:13:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=3qRnYWHc; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=DMSCWcI/ DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Date: Content-Transfer-Encoding:Content-Type:References:In-Reply-To:Cc:To:Subject: From:Message-ID:MIME-Version:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=JF1pnqbXKSWwSGl+DNK/4b0ZXzkJHdp0SgzkvV9vFQE=; b=3qRnYWHcL+lPbvaYOzoaHsKECP ZdtgKRn723zTSjeIogPK+G3F2Wye/8fcevGdMpAtWRkmNXR6UnEh3fWf/cdcO39Y1F5SNlBmfz1Hq niYEIbyt2YoL0pLfQMGAZoCW0345R9NgxbOIOXEcYsfZFB+5RsfxU92D4pfuNCmaX8GzD6rOv2rjD QmaD0e4VChAOb1AEvRvdrOB2c0lTdHOlfh8lF3Lf2Mup1km28HiV4GaWtKdfO2gXZxpCuWS2todlc lPeHXp1deP+1knKvyczTMYfDj9D1RgGBk0RJd5/I47yCcQ8Q71hGlmrSBGOaCI5jr9Mds8DOrlXJD Cjej+LiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLUot-00000003ViT-3C3P; Tue, 27 Oct 2026 00:13:39 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLUor-00000003VhG-40Wd for kexec@lists.infradead.org; Tue, 27 Oct 2026 00:13:38 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 63991600CB; Tue, 27 Oct 2026 00:13:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6DB31F01828; Tue, 27 Oct 2026 00:13:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793060017; bh=JF1pnqbXKSWwSGl+DNK/4b0ZXzkJHdp0SgzkvV9vFQE=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=DMSCWcI/LXq6xezPOD50Fq/K7eij4grdi+M2W53YKw3qj9e3En0uoqPqK8FmFxxXm NYtbARTFW+554+inMCNmeJgFfHLrLuAuhiYvFAGyKnsnDimxXrCFrp6YX4ilKNbIA9 ZDpUgMByPEbWP2srln+vRi5RBnSA4vLiH54y5in0m3UlS2kXMuUrFv9W/wk6vKYx0X GRCUdwFOdXMJWB4SgA7aLLK4Gcz3HIhY0ART2qB4HeGjGqoq/Ni3tXyWtbT2lLyjPr Fb7KduKFCxTDu9On+tb7GpKiR8IhYAL6O6gA3SSuxPaLsl4O+02Eofk32e9ysZoZM4 EnTdLdrqkekjg== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH 29/46] mm/mremap: use pudp_huge_get_and_clear() when moving huge PUDs To: =?utf-8?b?RGF2aWQgSGlsZGVuYnJhbmQgKEFybSk=?= , "Andrew Morton" , "Johannes Weiner" , "Michal Hocko" , "Qi Zheng" , "Shakeel Butt" , "Lorenzo Stoakes" , "Kairui Song" , "Barry Song" , "Axel Rasmussen" , "Yuanchu Xie" , "Wei Xu" , "Baoquan He" , "Baolin Wang" , "Liam R. Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Kees Cook" , "Peter Zijlstra" , "Jann Horn" , "Pedro Falcato" , "Hugh Dickins" , "Pasha Tatashin" , "Pratyush Yadav" , =?utf-8?b?TWF0dGhldyBXaWxjb3ggKE9yYWNsZSk=?= , "Jan Kara" , "Zi Yan" , "Lance Yang" , "Rik van Riel" , "Harry Yoo" , "Alistair Popple" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Usama Arif" , "Kiryl Shutsemau" , "Matthew Brost" , "John Hubbard" , "Peter Xu" , "Will Deacon" , "Aneesh Kumar K.V" , "Nick Piggin" , "Oscar Salvador" , "Minchan Kim" , "Muchun Song" , "Xu Xin" , "Chengming Zhou" , "Chris Li" , "Kemeng Shi" , "Nhat Pham" , "Youngjun Park" , "Gregory Price" , "Joshua Hahn" , "Rakie Kim" , "Ying Huang" , "Jason Gunthorpe" Cc: kexec@lists.infradead.org In-Reply-To: <20261027-fixes_core-v1-29-6f74bec9a5bb@kernel.org> References: <20261027-fixes_core-v1-0-6f74bec9a5bb@kernel.org> <20261027-fixes_core-v1-29-6f74bec9a5bb@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 27 Oct 2026 00:13:34 +0000 X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev Sender: "kexec" X-Spam-Status: No, score=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 X-Archived-By: > move_huge_pud() reads the old PUD and clears it in separate operations. > Hardware accessed or dirty updates between those operations can be lost > when the saved entry is installed at the new address. >=20 > The raw pud_clear() also bypasses page_table_check_pud_clear(), while > set_pud_at() accounts for the destination mapping. This leaves the > checker counts unbalanced for mappings tracked by page table checking. >=20 > To fix it, simply use pudp_huge_get_and_clear(). >=20 > Fixes: 7d846db7d0e2 ("mm/mremap: convert huge PUD move to separate helper= ") > Cc: stable@vger.kernel.org > Reviewed-by: Lorenzo Stoakes (ARM) > Signed-off-by: David Hildenbrand (Arm) Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261027-fixes_core= -v1-0-6f74bec9a5bb@kernel.org?part=3D29