From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 861EBCA9ED0 for ; Mon, 12 Oct 2026 18:49:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F11726B009E; Mon, 12 Oct 2026 14:49:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EE4F66B009F; Mon, 12 Oct 2026 14:49:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D5E596B00A0; Mon, 12 Oct 2026 14:49:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id B5FEC6B009E for ; Mon, 12 Oct 2026 14:49:26 -0400 (EDT) Received: from smtpin01.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id DD1B91613F2 for ; Mon, 12 Oct 2026 18:49:21 +0000 (UTC) X-FDA: 85314862122.01.9E4630A Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf04.hostedemail.com (Postfix) with ESMTP id 16D4440002 for ; Mon, 12 Oct 2026 18:49:19 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=S5Kydjjv; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1791830960; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=wjF42amL6Dxyn7QE+tOpdln0eb7clnjUQooAdiVZf+0=; b=gQ03erYFwWhC38fT0tGMkZoHlD+PlB8hUfjtyWAtK0jq1jneca8G0YrLrBUfEvtqj79v5q pf7QIdNGxtfMKiKYeJUXyzIkctSmYqTXKaHDuFd0Q/ywdxEHW6kknG2ZHZUXiAwZSL8DlC zVuSy1NJpCfhCLZSMLxxesXZDJMA5BY= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=S5Kydjjv; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1791830960; b=N4Ck3AE4J022qCQQTZoT8dhX+dzcYMax7r5tAYWDL57q6DE6c37/s7XkfSPuwPHkvcsrnB jZm5xsjXyf1xPrZf32cjVuP24T+cfYJC59Raw/eqI520fYNd2XTZE9O7Hgz/1vlgOJaA3x QqzFLjwwwVTyDiAPE6DqVfYC3bEFmsI= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 6152743C68; Mon, 12 Oct 2026 18:49:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BB4E1F008A3; Mon, 12 Oct 2026 18:48:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791830959; bh=wjF42amL6Dxyn7QE+tOpdln0eb7clnjUQooAdiVZf+0=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=S5Kydjjv9MS5+ikIdcZLMtuInYdV4t+V4R8UcdwFfxkBeySjLpbFVJq8LB6YxCqkr WeAECYnx1xgOH4BCK5UKPqhA6vX63IsVR+EXTybK7br7NLZ0u33YyIJ0w63zopC1kg GU+kcsTw0LbmCgEp5zsbb6LxKiUHFIKAoePc0l+qoejVs3yioGigw3j4rdpAoRlJ3I /cUbiiAInDyjl1r0HL5sbja+XefiWr/RVW0+MJ3r/tslGXWsYEcvK/wwGhtCVMUb4u wvTis4aZ/ONKs/Wu0zQSkB08hCtETluDlUNZP//epzAHhx9+9SCh4NVSRJMN9uvwGR v4bYjBEhcFCPw== Message-ID: Date: Mon, 12 Oct 2026 20:48:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 32/38] mm/madvise: use predicates for madvise(..., MADV_DOFORK) To: "Lorenzo Stoakes (ARM)" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. Petersen" , Simona Vetter , Helge Deller , Sebastian Reichel , John Hubbard , Peter Xu , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Rik van Riel , Harry Yoo , Juri Lelli , Vincent Guittot , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Arnd Bergmann , Muchun Song , Oscar Salvador , "Matthew Wilcox (Oracle)" , Jan Kara , Marc Zyngier , Oliver Upton , Catalin Marinas , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , "David S. Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chengming Zhou , Michal Hocko , Miklos Szeredi , Xu Xin Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki References: <20261009-b4-mmap-prepare-vma-flag-sanify-v5-0-923b70125b1e@kernel.org> <20261009-b4-mmap-prepare-vma-flag-sanify-v5-32-923b70125b1e@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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Previously we simply > disallowed VM_SPECIAL i.e. mappings not managed by core mm, fixed mappings > and > VMA_IO_BIT. > > Now the invariant is established that mm-managed mappings may not set > VMA_IO_BIT, the VMA_IO_BIT check is redundant. > > The rest is equivalent to testing for a fixed or non-mm-managed mapping, > i.e. exactly the same check as whether the VMA is permitted to be merged. > > This was established by commit 0b2758f48f22 ("Require (reasonably) normal > mappings for MADV_DOFORK") containing my hands-down favourite call out of > all time. > > Express the same thing differently - if we wouldn't be allowed to merge it, > then we aren't allowed to manipulate CoW behaviour on fork. > > No functional change intended. > > Acked-by: Zi Yan > Signed-off-by: Lorenzo Stoakes (ARM) Acked-by: David Hildenbrand (Arm) -- Cheers, David