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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7BC7EC79FAD for ; Tue, 8 Sep 2026 11:30:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=mB8nfc2dyoUj8MneI5XtqKUJWAX+H2A9jp3sF5M1qbA=; b=Za3u6TCAiMvb/SoLKWI1lqCR1G SwYptkUVZeaAdBI6F8Lxa9cPw4Yxq6ExSb/khxGOOUd9HOdpfLZg90hrQ9SQ28/vMo1jkgn5mQ70E pIIp668zE7+SS4CzIpkPhNgMoVxIxOOW4CG8qXSpi02CaOZ3R2TROyR8AzIAlGRK9QkAruv03kxvL z0cBuooIfwzVxU5cfe1bBu2PCkBHWrXN9CBBnh+idUDkfN6+0FjVyTB6Kqv1I/JAS6wU0rbr7rqPj BElDYJSeTJ+76PQrBJG7D9t5TzraDxpRheWMnvykAKADlSuYOkJfWsUQYWLj0s5SFkGTt8VNQSVbj 05kx6Ntg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x3u1l-00000008t7Z-06Fi; Tue, 08 Sep 2026 11:30:13 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x3u1h-00000008t6U-3cAV; Tue, 08 Sep 2026 11:30:09 +0000 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-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org 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