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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 4A077C98302 for ; Wed, 23 Sep 2026 13:43:52 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4hqdTy5W9yz2yqq; Wed, 23 Sep 2026 23:43:50 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2600:3c0a:e001:78e:0:1991:8:25" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790171030; cv=none; b=WZYz5F+8Rjd7Pt/JyWeLavEii1g+OugBdChfX6PyKYN5Sheitog/9rNM1FLDgENKHGxJkYn5Y8nnF3ngfav0KSvN3FVQ9FaKNg0EjNELHTIl68npz7x55DVdarr4A8HCIFwzz1rfr5TjF6QwfKQdnuX6qMGyKu1vgGkcd7qLWlLSeWfFgjIjIFCjuYblbhje/p2b2QIx+5q0iNvopgSPJyxjew1Cu+vtfDdLOE+oySR5qGvm8lOze6ThjdgyK6dUCsIFuhkMmj1bNMBF0Fs9kzZ/eXEKDvnfINB8jr0FLNq9lu+zMGSBP483+UM6SkahQflF7j7lppA0s9kc/sWpQw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790171030; c=relaxed/relaxed; bh=6xDgTcRD17pMZUKjE+n6zU9uG96i5536rlsM5iR5TPE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=l60Jcy/pv0POjMmnK4EdLd+F0PbEhW7k5AHSZ2bmOfznBFmPb1EdC/3VlrIRv+W++POz4gdb273Y9FIAJW4EQU/28yXAoqH5F1Pc+khkQFhqqLF1aBNmaOZtqxkDZdRBYHFef+qF6eqPhpJqjDZ90A8grEwy49WsnHdyLI9tQyTj0oaH4s3Zu0+PL5JHAVJAAc6YWOyzo+hDHm2EE242EJgNFcenMAfXTK8tq4Ht2+p561kzAGlcv0xzeNO6omtCM57btBwsoizJUtSKzasnj3BWGq/j/lc4AeTfenM4LCZWkb+XN7y2DxKsdhRTdeUQq5UMYO6lJRkRvFh+gbYaTQ== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=odmxHHcp; dkim-atps=neutral; spf=pass (client-ip=2600:3c0a:e001:78e:0:1991:8:25; helo=sea.source.kernel.org; envelope-from=ljs@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=odmxHHcp; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2600:3c0a:e001:78e:0:1991:8:25; helo=sea.source.kernel.org; envelope-from=ljs@kernel.org; receiver=lists.ozlabs.org) Received: from sea.source.kernel.org (sea.source.kernel.org [IPv6:2600:3c0a:e001:78e:0:1991:8:25]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4hqdTx4Xlhz2xs1 for ; Wed, 23 Sep 2026 23:43:49 +1000 (AEST) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 9136341946; Wed, 23 Sep 2026 13:43:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73A5C1F000FF; Wed, 23 Sep 2026 13:43:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790171021; bh=6xDgTcRD17pMZUKjE+n6zU9uG96i5536rlsM5iR5TPE=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=odmxHHcphfJU/2dNQHFnLCZHx7qUsOTN2unPx/tuy1nXDSyLZmeYwR7/Rjr7jfT77 QnuCynM47lsKoqJC1y97i+U1JvZkZUSXp9zkXwbycdpb9XJ+pApXutz7lCcNFAJ3vm vBWH4cHO+xn5wlHRsn6xzSZJ9/9k5KZaXvlcM22x8ZHXT/+6kz62RqW65s76Lppcuz F5EUgyH8Kf2PVj50ygyL2QutGkc1XBv8xpCS/e6hY65wLgFvWhIpVu4lKscZxay6Tm z5HHhYChWlwV8Hq1DsRMOKqUEfxwlsCQ4YbcBWu/p5tcGD9PmvWztotX9Xy/LdT1Kq 9Ab6m9tid+4dA== Date: Wed, 23 Sep 2026 14:43:16 +0100 From: "Lorenzo Stoakes (ARM)" To: "David Hildenbrand (Arm)" Cc: Andrew Morton , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Guo Ren , Brian Cain , Geert Uytterhoeven , Dinh Nguyen , Simon Schuster , Jonas Bonn , Stefan Kristiansson , Stafford Horne , 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 , Suren Baghdasaryan , Michal Hocko , Jason Gunthorpe , John Hubbard , Peter Xu , Yoshinori Sato , Shakeel Butt , Jonathan Corbet , Randy Dunlap , 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 , linux-doc@vger.kernel.org Subject: Re: [PATCH v4 11/12] mm: make userland page table freeing RCU-safe Message-ID: References: <20260922-rcu-pagetable-freeing-v4-0-fe1ad1f1e303@kernel.org> <20260922-rcu-pagetable-freeing-v4-11-fe1ad1f1e303@kernel.org> <72d1548a-a4ee-4832-b2ab-4bc82f1933f8@kernel.org> <802d3999-95fe-4a09-89b4-d01b60f8e963@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Sep 23, 2026 at 03:38:53PM +0200, David Hildenbrand (Arm) wrote: > On 9/23/26 13:48, Lorenzo Stoakes (ARM) wrote: > > On Wed, Sep 23, 2026 at 11:13:36AM +0200, David Hildenbrand (Arm) wrote: > >> On 9/23/26 11:06, Lorenzo Stoakes (ARM) wrote: > >>> > >>> It is the final piece that makes that the case, so I think it's OK to allow > >>> oneself a nice subject line? No? :) > >> > >> Just took me longer to figure out if I am missing something important. > >> > >> E.g., > >> > >> "mm: remove unused RCU-unsafe user page table freeing" > >> > >> would have been clearer to me. Anyhow, just stumbled over it, I don't care too much. > > > > Compromise on: > > > > mm: now userland pgtable freeing is safe, remove unused bits > > > > ? > > Maybe something along those lines, yes > > mm: userland pgtable freeing is RCU-safe now, remove leftover bits Ack OK. > > -- > Cheers, > > David -- Cheers, Lorenzo