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 4883A606A327 for ; Tue, 27 Oct 2026 00:13:45 +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=ZlxDbZXd; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=jw/grf2m 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=QHo9JMDis/nNK6J8U8zRMdKCromwj/kyHvEHOdJ+mKk=; b=ZlxDbZXd52px735743DM9zdH5g IIvkZ7NFz7PjtAgnQwsDE+VVzWa9ddUh6Emg+ZWKzQqvKojlMQg+IbhEWr/K0nPKuVyUDQiNbl8vF 1dkiaQGdJkP4gszanYpVZI7mC9Kw80z1fkSZZet9HZszD5FZk5scNwtJ//wuoR/TBC3CYqclD1h1G qik7yNIUQb4p0meGxRgvfQMXnOGlJOePiLeGcyiBVv6DswERXXAl3IuWtVVhmDp/CXh3dP7Dl/KO8 oBV+0w1CpFduk0YqxuWDEVcHTLta0ODM/I30zBgwsacKOZZiYDkK+1jlZBIqbr3/OHFSI5RslNSQn v5LKSa5A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLUoy-00000003Vm0-4Apa; Tue, 27 Oct 2026 00:13:44 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLUoy-00000003VlV-09uK for kexec@lists.infradead.org; Tue, 27 Oct 2026 00:13:44 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id C496A40E59; Tue, 27 Oct 2026 00:13:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2137C1F01825; Tue, 27 Oct 2026 00:13:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793060023; bh=QHo9JMDis/nNK6J8U8zRMdKCromwj/kyHvEHOdJ+mKk=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=jw/grf2maZc1TDDZ7AlMdDeSI0WYjK8ofD3p9WzL0KO0Asexwu1PDk8uOfAmQMqbN /Mzzanmki5dPReaDjAFjKEPzvhl1kuPqxQCXIKa3ub/49OGK64ajBQzOpE0biwrDC8 DPxeCgm1IQvbj4b0zLb8xKrHqVln0+39ubnwRbmCiW6yXE5ne5qPlsb4M6ADzgaFs0 9GHKzuVXob2Jza5n+QGSPJqsvl2LTsDsYKrGmnDbXaIPVDfpKRvvYKulMpVlUkqzU6 mq7IcjTfQtEbbwAQudqafuLf7mJyp1Rl72iFjnVhnt9nQsRA7S+XKquL8a9CjP/RdR xpAnyKF930HVQ== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH 31/46] mm/mremap: fix moving PUD leaves 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, "Josef Bacik" In-Reply-To: <20261027-fixes_core-v1-31-6f74bec9a5bb@kernel.org> References: <20261027-fixes_core-v1-0-6f74bec9a5bb@kernel.org> <20261027-fixes_core-v1-31-6f74bec9a5bb@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 27 Oct 2026 00:13:40 +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: > From: Josef Bacik >=20 > pud_none_or_clear_bad() only really works on page tables. PUD leaves > confuse the check and make us clear the page table entry and print a > warning. >=20 > Since commit aed877c2b4257 ("device/dax: properly refcount device dax pag= es > when mapping"), this also leaks device-DAX folio references, mapcounts > and RSS accounting, resulting in "Bad rss-counter state" warnings on exit. >=20 > Allow PUD leaves in get_old_pud(). If a PUD leaf cannot be moved as a > whole or the move fails, split it. This unmaps it with proper accounting > instead of treating the leaf entry as a PMD table. >=20 > Keep using pud_trans_huge() for now, in the future this code should be > cleaned up to just check for PUD leaves. >=20 > Fix generated by an LLM and sent by Josef Bacik in private. >=20 > Fixes: a00cc7d9dd93 ("mm, x86: add support for PUD-sized transparent huge= pages") > Cc: stable@vger.kernel.org > Signed-off-by: Josef Bacik > Reviewed-by: Lorenzo Stoakes (ARM) > [ david: fallthrough after splitting ] > 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=3D31