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 BF5B6C9830D for ; Wed, 23 Sep 2026 09:14:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id ADA756B008C; Wed, 23 Sep 2026 05:14:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AB2A06B0093; Wed, 23 Sep 2026 05:14:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9A0CC6B0095; Wed, 23 Sep 2026 05:14:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 662FB6B008C for ; Wed, 23 Sep 2026 05:14:05 -0400 (EDT) Received: from smtpin17.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id A7DF5C06FA for ; Wed, 23 Sep 2026 09:14:04 +0000 (UTC) X-FDA: 85244465208.17.8FC23B2 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf17.hostedemail.com (Postfix) with ESMTP id E4F4140008 for ; Wed, 23 Sep 2026 09:14:02 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=kWMCgiXL; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790154842; 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=Z+j1lHJE5F3iMb8nSY99OQtjlVOCv/aNXLt1f/fnIwI=; b=HVEmMpzMJ/lg34txrsG/KYcO0gg3znYsRoYo4XVoE9NARbxs4MfVGDy2nebZNxuiz9rbsz MfQiPMe2nBk9NJ1ZomB3krG5hDE/CG/jWYxa/3UQb/yI9zMCuy3hIrXFAzfBrPaEN9i1CT NGPX0UiedvPrk2iytVdOJTvSb2GjZ18= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=kWMCgiXL; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790154842; b=X4tEmfsBJQLRp93UY9yQk7O/cEkckxrT3GTmM+As9urkWnXvEqUymCiRFV2izqv95LHF7h /2EmtXq/8Pl9iMdcbw7sgFfMDbd91Kjs7FyZlhrI4RkloontrvE0Rw3BjseYQrFhkRbaEy rqJ5+ZPG7nPdtHMbnsZnQoG5jpyTyGQ= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 51138601F0; Wed, 23 Sep 2026 09:14:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72DD41F000FF; Wed, 23 Sep 2026 09:13:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790154842; bh=Z+j1lHJE5F3iMb8nSY99OQtjlVOCv/aNXLt1f/fnIwI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=kWMCgiXLIQ6wuVlwnnRx3lJKHDLxKLCH12IowjOX7efeQzZGOJawCaHUfqRK5YQRX eyw5xVCFRsKuaXNkT2f1HZDd8aaiBjUul7jvkwjO6j1afG61xfht5mCCPSKKp4Dhe9 rzhiHvxgoP5JCx5uMMA6TbPPpBXNI0TvsBqy8ptvMlhuhl3LjdN19l8FOcusuHqGd6 W/Lu00eio/hX6O8BOK5kdqlsJZJnYqJ8DQtyzzxsImYdJDJx13pZ4NSi9WHt1anikw dlxfFEX5t8FcpmSHMomNE+o4ZWePsDJ5WRA6GO3q2+DvMeaV13VT0Jhtfi25HVJqjf K7utRZ1UWwiog== Message-ID: <802d3999-95fe-4a09-89b4-d01b60f8e963@kernel.org> Date: Wed, 23 Sep 2026 11:13:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 11/12] mm: make userland page table freeing RCU-safe To: "Lorenzo Stoakes (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 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> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: e3rdmznaopocr4nsmg617gyf1hxb11fz X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: E4F4140008 X-HE-Tag: 1790154842-439394 X-HE-Meta: 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 Yj7F9KDz Lmvwybk0H/xMap6INhJRp7W07JnZOCoR6M3pI4VjkLjF4A/5uWU0fnEr7d6RVzlJ/A9VH7/1U3uzcdFRFEzcyN4t4h7IHpyMnF9+sti8nxnNcLOWOtIGrGWGQGNhdhI5gPZh2g18biaddyHhCGM/za1w0iwYE5HGA/u3srreoH4CDlH0gUVty17mn25D56rslLSEgaINfIHGrtcBLyV4uFddCLN412M9Y/7kK0ldXGprCaVLbnCd1GrHpMZEgBT2bFuLCYk9Hwt0FfC7afqrgZNqxNDPY3mkuHWEHo880Wq+ecR5ri72NC1cXxAzlgd8Z2meYA006KBmuJEQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. -- Cheers, David