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 386FBC982FA for ; Wed, 23 Sep 2026 11:40:04 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 50A976B0093; Wed, 23 Sep 2026 07:40:03 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4BAE46B0098; Wed, 23 Sep 2026 07:40:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3A9FF6B0099; Wed, 23 Sep 2026 07:40:03 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 160916B0093 for ; Wed, 23 Sep 2026 07:40:03 -0400 (EDT) Received: from smtpin03.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 89B47A07C0 for ; Wed, 23 Sep 2026 11:40:02 +0000 (UTC) X-FDA: 85244833044.03.FB2AE68 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf27.hostedemail.com (Postfix) with ESMTP id BED8140004 for ; Wed, 23 Sep 2026 11:40:00 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=BVRkS6gt; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf27.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790163600; b=O/T4hESXMVKLwHewHZKqwUsAHUgUu/LY5TQo+Q/ROkA4iFj0x0GwZfY/4OvtS6kY7m7nL4 2Wwu0HJZuI08Pi4HQk2TjbpRLLXC4hox7lc5en3eYqUGhipDGcbS+hV81F5ewF4lVuk2uK egP3D1gkYWEgbXXgZo731kIFom/EisY= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=BVRkS6gt; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf27.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790163600; 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=eLrpgKuhQkoqnu0vp0p8SbJmXaLTmBHhu9O+CiN2Vjw=; b=HVqfANyXV39QxzZnPAHeYBjT31j95HGSN9EQSHsAossYmKRHrakUd55FmsaA6RnrouCflq iwo7p2+WJGyyQG9sV42sieN2rWd8CvcGKrbsds/ihWeTTUCpuWo4qCzZqpsBgS5r63WLTV mOudj6Lu3aYWFThDT8PXOtVl9b7glpQ= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 6993540DB0; Wed, 23 Sep 2026 11:39:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D8711F000FF; Wed, 23 Sep 2026 11:39:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790163599; bh=eLrpgKuhQkoqnu0vp0p8SbJmXaLTmBHhu9O+CiN2Vjw=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=BVRkS6gt4XoYQOeCEfHPhRO7ByeHkhEEqQphfsSe4SuC1tCT0cXzY7rwECIeYfmTQ 3re4dkJjl7SIZd81ZkMc56LvPd1cysERrJMNbmXFLXhsqS3rtneWLoeLPSSv6Uv8w9 NqkNMMg1o3qPDa9QeTRxreqsGE9tRJkygczoThYC6QrTl2ldDxoW9x8DTR+mvQh2uK s2F7yV0/wbhQRtUjiExmkJXBbJDhmPYa+/Zos6QWnaG7zkq3Gk8Aeud5bark6jRmzS Xv0T5RU8A1tfwnKhxw4IPFOwigl65eC/Zok10skwSamz+CrUYHC1z0FbIRAVJRQIwx NnBagpGL/fxrQ== Date: Wed, 23 Sep 2026 12:39:41 +0100 From: "Lorenzo Stoakes (ARM)" To: "Vlastimil Babka (SUSE)" Cc: "David Hildenbrand (Arm)" , 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 , 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-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 00/12] mm: make userland page table freeing RCU-safe Message-ID: References: <20260922-rcu-pagetable-freeing-v4-0-fe1ad1f1e303@kernel.org> <20260922160021.a2fc65d05d9b867a141e5457@linux-foundation.org> <9dcde7e4-dadb-4644-9dff-7fd8a26e29a6@kernel.org> <77db2f8f-dfc2-49c6-82f6-8e6c4f7c1fd0@kernel.org> <300f92ef-1526-44d9-a01f-e9b8f3fc0cd1@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <300f92ef-1526-44d9-a01f-e9b8f3fc0cd1@kernel.org> X-Rspamd-Server: rspam06 X-Stat-Signature: pmyndasx1y3qs8e1spns95n3wgny49cx X-Rspam-User: X-Rspamd-Queue-Id: BED8140004 X-HE-Tag: 1790163600-238172 X-HE-Meta: U2FsdGVkX1/ty/qfLkbpN93x47uvzP38LvnH6GrMXZ0HX7iqF3Q2A/G6F9FlvaVQTaVfFdVbQNgq9EaTT4E9PnIBCKBIiK1eLu/BtFHmRXGDvvj/7RciVSGmKzRfuAxi94DRWnCHoWDdLLRRMZz9bSTjgyeqBBbDG82og0bfBi2Z2ddJVcNWwlOonDdcWfYikYxLhUuUtYSkoonyqUAalwlISmyxrq+H/sL+D2nHOVD7I+7y8b2GFlpolTCKuzrygUgS8kkFMgZeeGBQOK5iJ8W3BGZVOHxFiyKNIkIwYxVRRXe1AxaGD6etcvJGmfFSGe2ex5axAmZ99y5wLxMuA8c+IGB/M3pOFFu3IUrD18kHfQKoxyxtQ0Hcx+LIFwPMLJIC0cEKqJci1/Bf8p7uewP2QrfvyUPjIjqWGyprd7RIdd9Q8q6+W+Ayw4tb/08hfP8i9i87PZPzwV5Sh9wRJsL79s0zIJOChVQzuKAqChURDgrk0D5TC/FJH4lgpgs1rBk85TeK13WenBzfjS4Js/GKQ8D2JoQJRCcdMdCNpBkf71+Zcr7LmbIyoeLbKSwTos0IeQWoCKB8sDbawbDUJ5+iWfJdcJyx9b2N6LzIrDwygV6gS3FFv5sJKGki9/cpB74UI+sC8McmDcl3WPB9ByljUhEXTOOOcsc3I4p9VJaw1/yQxmX7RNSy6/wefrbfNWDOjGv+zFeLYGwfMuMSMxww0I4oBvhwxCchKixlhlYxfA+1Q2a+I04X7+R1+kXFtjlEkwGzdsiocS78PoXsrwJAfWQQ/0xVJiHww95eH0hCJppQWNx5SidQ+1t55eQPN6r3Qfdl2BDrYP0vd20r6HJLVl5pzr67ncBI07++dfIlR1QjnpXl5CrRyBmOePrdK1XgPVZfyDlEGTbw2hlQZnoRTTRQUATWIomPqGu5MFTNgss+niCYbYaMEVzlFbSaxGAcepgHFSjxSTWQffz k+WiZO2/ 9xmASOkOfRUmU+UlbIoYjgA2d6jV8EoJusUwEel/BP0f44hnTwr5JzChe1TAoTxUrMqgAepdKwCAzF408jZ+BZiEWp3DHTAFbegzKeR5bqjjSReWJ1Jm7vGzqN5P2s4SeErlEdnIlR5+ZoZipfr/HkFcYy79UgYDDw8dCoLy8HQ+wp3UWuTAktoe2egK8n/KKlsuq6kwmOJvWBxiMcl5pxEDgdY9vHA9MfcXAq5xBi43uhHuEGF28lC075eIU0fS/s9YS2GjsZMB4J2DkP8SlDt6RFKqRPtbWxXXlKVU2SbNZo572XLvDWKmVkaYvo6OTv9uViX3XMHisq6I= 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 11:39:27AM +0200, Vlastimil Babka (SUSE) wrote: > On 9/23/26 11:15, David Hildenbrand (Arm) wrote: > > On 9/23/26 11:04, Lorenzo Stoakes (ARM) wrote: > >> On Wed, Sep 23, 2026 at 10:45:33AM +0200, David Hildenbrand (Arm) wrote: > >>> On 9/23/26 01:00, Andrew Morton wrote: > >>>> > >>>> > >>>> Do we have reason to believe that anyone is seeing any effects from > >>>> their arch's failure to rcu-free the page tables? > >>>> > >>>> This sounds like a rather long-standing wart, yes? > >>>> > >>>> The patchset is thinly reviewed and mm.git is bursting at the seams > >>>> again. I'll play wait-and-see on this series. > >>> Do we want to nudge arch maintainers to review? > >> > >> (Just to note that I replied separately, 'thinly reviewed' is incorrect, it's > >> been in -next for weeks and the whole thing was reviewed by Kiryl.) > > > > Ack. > > > >> > >> The only places where that would be useful is m68k motorola, sparc32. > >> > >> But in any case it has been heavily tested including on every single arch > >> listed with stress testing performed (I think I cover that in the cover > >> letter). > >> > >> The changes are not controversial so I don't think that's a blocker, but > >> it'd be nice? > > > > I doubt we'll ever get sparc32 reviews :) > > > > I'd definitely appreciate some review on the arch bits from arch maintainers, > > but if they don't reply within the next weeks I wouldn't wait on that. > > Indeed, for minor arches like this the lack of review (it would be a whole > cycle by the merge window) shouldn't be a blocker for important tree-wide > progress. Thanks appreciated! Greg from m68k has had a look so seems we have movement there anyway! :) -- Cheers, Lorenzo