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 B7E4BC9830B for ; Wed, 23 Sep 2026 11:40:05 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4hqZl74C4xz2yqw; Wed, 23 Sep 2026 21:40:03 +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=1790163603; cv=none; b=lwyonCYL9aGAN8qjmJ49d7gG6/YxAwKfHDP9vshGvYAd+VCb+4Hqge9Ocgf9PsWJmCLRwt7jnGBsyqdcMFyuYbeIKXTLaVFgLPAzhqgiGwIY8t1nY3XG+XkEaP4Zu/sgBjmWg8JLCm0Qi1X8Iiwwv2O/t2Scv9fA3RUefRahdibVPLJLnceg3ji65PFCWlONvLjiVMbi75hNsw8sylTJ7dNZp+PQcxq5peBh0XbuuHTeuDLLmro0oOioTm1RKX1Xo+z6GcwH9//WI00jVbRCS+vOFibMbPFeRkpWCzpojD46+oCiDtzOzHBrMfeKT8lXOu5XQamRJiGXmYjt9iRlxQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790163603; c=relaxed/relaxed; bh=eLrpgKuhQkoqnu0vp0p8SbJmXaLTmBHhu9O+CiN2Vjw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=FNUPnXs9yTpKE0DAhqOLpaRc+Lha3CYjxUG2cVpQRy1+fX1+O+u3KXOZC/cfMNGfrceeeaM3oWLvuiyfvZ4MTPYlsm4Ew6guo2qJdR3fm0s0LwBnikWPD5LoswOVlo0radp8rHXZNVNJq59SN0ITI0lwiPSukrja5AvSKRtiWPaX92q6+IAqcQAJ9BDMMX4/FAcpYecm4/2O++JzDqVg1QG/PPIztOTUKBKIe+cjU3mNvkj0z2EdnzCNd7XCpaNylqk4+hJeWlm4VdMoaRAa1sQorqSk9QtN8VjE/o500Zme6oha0+OdLGchSzopyetb0eyaVK9o4CVtq3XS/aqM9A== 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=BVRkS6gt; 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=BVRkS6gt; 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 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4hqZl65JcHz2yqq for ; Wed, 23 Sep 2026 21:40:02 +1000 (AEST) 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> 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: <300f92ef-1526-44d9-a01f-e9b8f3fc0cd1@kernel.org> 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