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 92B4EC982FA for ; Wed, 23 Sep 2026 11:49:15 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4hqZxj5kF8z2yqw; Wed, 23 Sep 2026 21:49:13 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.234.252.31 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790164153; cv=none; b=XQgH7NWJUTsT/pNo0EUfjLMrg2otab8I1zu0BMsyQ6Tpa8Iq9oDFnQXmOuVTMuYplAPBmMMqhZFxTjQxuDQTpzTkfFaghZiWCd/aKNiw56BaLyYs57Tm5nX931rt4ePPhyExta1XBAazhP+3hRjFqstvHBrc887NmNDPjgb+PuL0lWFTSqDK85cC56BRBz7RlHYU/Ta5uC8+5FzkFdiJPvchtY4obZkXbOOLQeru8aiiKaVDkw8BY375Vg7Ob/lqrfoxhLWsZPqtd+iPeiSPnqAQRgjmnQKxaDfcXci/hl7HfHMTmySFC6zAiuPV7mwNl/fWqhg9X85GPBQCXLY0HQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790164153; c=relaxed/relaxed; bh=Z18U4qa6LbbRW6yI1ebVsuAYdmDir8PYv46mTQmvxDM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=D7Pj26uuqthdVIs97iABc6UfLvnHUUTuv1b1MH/IkDSF5Sd8smKkVEK4gVHrRWXoeHYcbEXodm3mOoN3MeCJur7PADm+6asHtxT0NVYil1uUB9ScFFsH9tWHx/xT3yskRsJKh57IBFwhUBBZiz4TkDVpH7JQJA2MOcqOLC7iBcFQckk/xHtCIqRsqZ+ei8Krc18Le/CK+aNWIgns2RHdrL0xdkimzkUe3WN8Nr/93P7/IdyFP1FTH6nh6eQ0PCXrtxxfzWByVlLddPZ1qTWPgqhUarh1SYvL9LEiR6aQ+3wn1DEnjqySdRq1AcpyfIVq2mpxekrKeiGPE9vlF48YCQ== 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=D0HspulT; dkim-atps=neutral; spf=pass (client-ip=172.234.252.31; 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=D0HspulT; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=ljs@kernel.org; receiver=lists.ozlabs.org) Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4hqZxj08Z9z2yqq for ; Wed, 23 Sep 2026 21:49:12 +1000 (AEST) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 15F3A40B9C; Wed, 23 Sep 2026 11:49:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19B941F000FF; Wed, 23 Sep 2026 11:48:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790164151; bh=Z18U4qa6LbbRW6yI1ebVsuAYdmDir8PYv46mTQmvxDM=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=D0HspulTyBdCQX+9DDqdK27FApcPCCvh0cfa5A2rbZhHewxbqqnqFfAC7nocs+kP2 0mvVh8QH9qXFX6+3roRxbIQueQ3TPhzi292qpq9D3xRZZ5wrxeyaLz+2QvciRn8RF2 FVQ8S8jycXpuDyJ9rlAicpdmH0A4zO0K41QTIIgv5uUQwQu8Cyh3/fZ149W1dOnWWV yYYskNeHf77UMMMQLOJF6vyT4QfBuWnpw9G3F145FYd/VJTxiJBTwTSUUZpHmcLZ58 JQgdeq38PegQ/KA2Ovq2zM3pjhtITbOaI5GbiIAo2djGnpsU4gEkvZ674V/u+BfhWb OSemwb5O1SYug== Date: Wed, 23 Sep 2026 12:48:53 +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: <802d3999-95fe-4a09-89b4-d01b60f8e963@kernel.org> On Wed, Sep 23, 2026 at 11:13:36AM +0200, David Hildenbrand (Arm) wrote: > On 9/23/26 11:06, Lorenzo Stoakes (ARM) wrote: > > On Wed, Sep 23, 2026 at 11:04:17AM +0200, David Hildenbrand (Arm) wrote: > >> On 9/22/26 17:35, Lorenzo Stoakes (ARM) wrote: > >> > >> The patch subject confused me at first: that's not what the patch is doing, no? > >> Previous patches did that, and now you're just removing the leftovers? > >> > >> Maybe I'm missing something that this patch does along the lines of teaching the > >> code to be RCU-safe. > > > > 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 ? > > -- > Cheers, > > David -- Cheers, Lorenzo