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 00247606A31A for ; Fri, 30 Oct 2026 03:42:32 +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=Gc9uah6N; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=fLbwWRdZ 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=wKRDIwlNotbn2pTACKd/ug1jEVrX0r6bM2vUYvA137A=; b=Gc9uah6NfAYIBvGtjb5ndtG1SQ IVbLSPEx4U7vCgSV1PzuIYbidKAI+7uTvpmZhABKbU4Z35DMXxQMCzFWhp6o8x0K8+99lyce1nou5 gg1mbxBjyQU6qw6jyQNphTYzUgCOmk7R6szJd6gBPag7fYnp22Uvvv6dV3EKKiHAIv2Zyw38mxn73 feD6sQQpZrua9S3Rdc0EQHBJUigOZ+ophtKoCcgr640gPECEZjhoe14steqFGrs9Szh8GogOMKpyW d8k/WR6XfDuP8bcDb1fI24JER7Toqh+KBDSx/Mxwd0mYZsRTXqcwlAvYL3LR9Cj+acnBRNgpX2r4L 46bIUWVQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xMdVg-0000000AlCD-1nAV; Fri, 30 Oct 2026 03:42:32 +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 1xMdVe-0000000AlB8-3HNt for kexec@lists.infradead.org; Fri, 30 Oct 2026 03:42:30 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 7898140591; Fri, 30 Oct 2026 03:42:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 899171F000C1; Fri, 30 Oct 2026 03:42:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793331750; bh=wKRDIwlNotbn2pTACKd/ug1jEVrX0r6bM2vUYvA137A=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=fLbwWRdZHN/LG5u47Q/45vT9Aev7MeA5MmBbL+5CedwWMaiapKC8ZoLyLQ3quCnTL TXHa5XZqMJBa9lqRtpKN4myab77CvH2EI1Ey2c+pD2wsDOIirdFxI7/axMWDssd/Rr oYdjWCcLcByFeJUN3eOeOvYQYy6LPhAl+SDw+hJgnE0dTcWv7xDTBZuw8nupJfWb+n 8OvKRl2twd9WW+LNSboSgYU+N2RgUZa5dJ4DHGOwopxdmEbZ0ZZiHmBMUZDuVKo/PP L3g0/w+ud04RNn/bykWZjzi+D87CTj1vDFlrZVLGXTE+U0HHZxYHk9WI47WudVy6o1 tD5sPmlQXJ43Q== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH v2 42/47] mm/vma: call ->may_split() before a partial merge 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, "Chris Mason" In-Reply-To: <20261029-fixes_core-v2-42-a64ce7f83abb@kernel.org> References: <20261029-fixes_core-v2-0-a64ce7f83abb@kernel.org> <20261029-fixes_core-v2-42-a64ce7f83abb@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Fri, 30 Oct 2026 03:42:27 +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=-10.9 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: Chris Mason >=20 > A driver can use the ->may_split() hook to forbid a VMA boundary at > certain addresses. >=20 > A device-dax device is a character device that gives raw access to a > range of memory through mmap(). device-dax refuses any address that is not > a multiple of the device's alignment through vm_ops->may_split. >=20 > vma_merge_existing_range() can move boundaries, but does not call > vm_ops->may_split. >=20 > If a range at the edge of a VMA gets the attributes of the adjacent VMA, > the function moves only that range over to the neighbour: one VMA shrinks > and the other grows. This is a partial merge, and vma_modify() tries it > [ ... ] > [ david: improve description; cleanup the code ] > Reviewed-by: Gregory Price (Meta) > Tested-by: Gregory Price (Meta) > Signed-off-by: Gregory Price (Meta) > 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/20261029-fixes_core= -v2-0-a64ce7f83abb@kernel.org?part=3D42