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 44156C9830B for ; Wed, 23 Sep 2026 11:49:16 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 199746B0088; Wed, 23 Sep 2026 07:49:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 149D96B008A; Wed, 23 Sep 2026 07:49:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 039496B0092; Wed, 23 Sep 2026 07:49:14 -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 D11B76B0088 for ; Wed, 23 Sep 2026 07:49:14 -0400 (EDT) Received: from smtpin19.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id E79C51C349E for ; Wed, 23 Sep 2026 11:49:13 +0000 (UTC) X-FDA: 85244856186.19.CC6ED05 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf14.hostedemail.com (Postfix) with ESMTP id 4C3EA100003 for ; Wed, 23 Sep 2026 11:49:12 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=D0HspulT; spf=pass (imf14.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=1790164152; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Z18U4qa6LbbRW6yI1ebVsuAYdmDir8PYv46mTQmvxDM=; b=0x/lm/uwez6shMopFaN3hMsjchdsIrfDBGKYx6JyMfzLlwnDFiHNHsVQScEsHb5OvamK3D YCGzzeupW/S+4bMTfoEgDxe+q4r0exHXCGE9aK/jAzGuIdg4APe0stQDhLOQHSGctEdU0q ZvuSCNt+tL8U/EtYoMLKfVGX0aohP2g= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=D0HspulT; spf=pass (imf14.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=1790164152; b=ghlJsdY0MBmzXr0nOqE7kiriyC/aypP1GoZn2FTdl2BMZzqP/chz5afwlSATr8viftg4im Ar7DZXpOVU5Tam8xwupCo2q8/oabGXiggs78ZfiUwg4TiN62cBqBAq3PJMOFIYYhcoWi7b c4WQZA7qPwTTubOYMBJefgAiIedYqJ4= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 15EAD40A5F; 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <802d3999-95fe-4a09-89b4-d01b60f8e963@kernel.org> X-Stat-Signature: mri61f9f71b3hprc4wst66s6fs8kgngh X-Rspamd-Queue-Id: 4C3EA100003 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1790164152-59064 X-HE-Meta: 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 8iNM5iSM NK1+4JKa0/J3gO+p3bcafAR0HlwxZov8vkkAlO4NLqHNTy4Hm5LqfgMeBDANlP3TRSSJxczpAV1KNj0JOLsZUYZct+7kJh/E2FjD/vtPRvyyoDsJuzUu0M9t9oRfXQz9qG3ewV3KY3DQr3cOd1CYWl8X75X4jP/wSSdeRnbqaDLbLic8TofNXQwbAwFh1ijryK/1d2j1CZz9nFaBQazCV0/oNGTecG/aV9LiVFk5ZYoh7R+a0QEB+8AeOdSEUx6qZXODhlHlbgxkaCL2gtv5/jqno7pYrxrJOd40OmvsKDwKZhCloHz2ex11xXaZANxFWumf5b//4e2Uo8l0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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