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 21074C79F82 for ; Tue, 8 Sep 2026 11:30:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 205DE6B008A; Tue, 8 Sep 2026 07:30:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1B6886B009F; Tue, 8 Sep 2026 07:30:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0A6586B00A0; Tue, 8 Sep 2026 07:30:17 -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 DF5656B008A for ; Tue, 8 Sep 2026 07:30:16 -0400 (EDT) Received: from smtpin16.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id D39441C2578 for ; Tue, 8 Sep 2026 11:30:11 +0000 (UTC) X-FDA: 85190376222.16.AED0B9A Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf29.hostedemail.com (Postfix) with ESMTP id 2E1A8120009 for ; Tue, 8 Sep 2026 11:30:10 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=BbzZ3F73; spf=pass (imf29.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@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=1788867010; b=wDqqUcwrNGWAocBXtD9OtxXtR1AgedbwfuEY07iCI6itfbN5Mmtg0m3zeGA74wyomB9wAS qXdvKxVy84hhCkhBy26V/vSZT9+RvHKBJqvZ6sjm/tXW7pi9gKdaQQA7k7KU7pm+us5f+p 0HERrRhNl9oaTTuclrU+sGL5SwuMvYM= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=BbzZ3F73; spf=pass (imf29.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@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=1788867010; 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=mB8nfc2dyoUj8MneI5XtqKUJWAX+H2A9jp3sF5M1qbA=; b=cBQQAN5Lf8gj8Cr8Q1ZYsnEY3I1mri9xJZGSQGhizEipXhtuf1Mp2GBZSb8DYRvlX1i3LF OGunV2BxqeYEowreS3aE5ZpO11OBUZ79zegZxIlojHhrcXxLPQ9Idtpsj9jbmJWnM4QG7N Cmsjg9GebHHs0ROBdQtU5qK7OgxbnEQ= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 74F4D43C1E; Tue, 8 Sep 2026 11:30:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1CBD1F00A3A; Tue, 8 Sep 2026 11:29:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788867009; bh=mB8nfc2dyoUj8MneI5XtqKUJWAX+H2A9jp3sF5M1qbA=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=BbzZ3F73x9vlPWvAcrfnuEIBJXW3qsffsRXzmqRI35CWZGCBYksgG+FZ6D4aufx7+ sEVq9yImHXZGqNWFVp5OCg/tUPoqmbCnXM4gOVpEztvlmpfzA1qGnFHu5hqumBWzdY N5H85H7ubmL/KpLoi3BPX0MUJ8xr61MTWOAacXoR48MSTMJ0Wfiiqe1Y/y4kuLcp+l khOBR7+6+n4ltCTDSLtuvWLW78S/WOu2iBGYFFag5m3jqVXrl0QqQoIKHO1R75ph5X Qb1cRBjIYoRUQrLjUPvWxDGa1pvp8BiecTbRNMlM0odqliUSIGX+UuU4BPhFAXN8b9 dTjdPKOeABgjg== Date: Tue, 8 Sep 2026 12:29:46 +0100 From: "Lorenzo Stoakes (ARM)" To: Suren Baghdasaryan Cc: Kiryl Shutsemau , Andrew Morton , David Hildenbrand , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Guo Ren , Brian Cain , Geert Uytterhoeven , Dinh Nguyen , Simon Schuster , Jonas Bonn , Stefan Kristiansson , Stafford Horne , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Russell King , Vineet Gupta , Michal Simek , Chris Zankel , Max Filippov , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , "David S. Miller" , Andreas Larsson , Richard Henderson , Matt Turner , Magnus Lindholm , Catalin Marinas , Mark Rutland , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , "Christophe Leroy (CS GROUP)" , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Arnd Bergmann , Vlastimil Babka , Mike Rapoport , Michal Hocko , Jason Gunthorpe , John Hubbard , Peter Xu , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-arch@vger.kernel.org, sparclinux@vger.kernel.org, linux-alpha@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, Hugh Dickins , Qi Zheng Subject: Re: [PATCH 12/12] mm: change the contract for free_pgtables(), update docs Message-ID: References: <20260901-rcu-pagetable-freeing-v1-0-5456a81c8212@kernel.org> <20260901-rcu-pagetable-freeing-v1-12-5456a81c8212@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 2E1A8120009 X-Stat-Signature: zuajxodqqf5wkbftqroy1x83dxtrkr1s X-HE-Tag: 1788867010-46680 X-HE-Meta: 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 nLyzukI4 AR/OPDhzaNp/IZBNjNvL21nuOJnkusLJJ6THaGEqu3ooafocQbeJ4EGn6jjA92L3TfOMr/Hy8wFiAYxv7S5seK7J4nIH3KZd11TuOL4zfeFJoFVdqT8c3UR5A/JM0EPaUow7Sty1nV+idk6+T6CA9LHpGjC3twtWHyYaO1ts5hdiZ0MnLbLwaDGOy3eM1jUGjurzBVJoVZRnG/nyI+QIReKg50kGsb85DzoeH/y5zcZtw9eQNAvxEDZTG9iWvO8Oy2zh5hUcaDDnXnqH3dbuU1Nr9fme3zqFNNa8xnj7H0rAE5byIN0IH1xDmtYsqP2DEYaBxn9CxzTLP6EtPhxI3vWb3987sL1RGfPB7pyR0j+cSZNrAMd4gvBspwr6sh03DJ7sfPhA7VfYOafBI6lANb+JxWsd6hfceliE6pk8F0TQ39PY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Sep 07, 2026 at 09:53:43AM -0700, Suren Baghdasaryan wrote: > On Tue, Sep 1, 2026 at 10:25 AM Lorenzo Stoakes (ARM) wrote: > > > > So, maybe something like: > > > > > > > > * Note that free_pgtables(), used after unampping detached vmas, or when > > > > * exiting the whoel mm, does not take a page table lock before freeing a page > > > > * table. > > > > * > > > > * As page table freeing itself is RCU-safe, page table readers can safely run > > > > * concurrently with page table teardown. However, writers cannot, as without > > > > * a lock nothing prevents concurrent teardown. > > > > */ > > > > > > > > Instead? What do you think? > > > > > > s/whoel/whole/ > > > > Haha yup the inevitable typo... > > Also s/unampping/unmapping please. Ack will fix on respin! I am the typo master ;) -- Cheers, Lorenzo