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 71E40C53219 for ; Wed, 29 Jul 2026 14:54:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6BB056B014A; Wed, 29 Jul 2026 10:54:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6465A6B014B; Wed, 29 Jul 2026 10:54:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 50CAD6B014C; Wed, 29 Jul 2026 10:54:42 -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 1F6E16B014A for ; Wed, 29 Jul 2026 10:54:42 -0400 (EDT) Received: from smtpin13.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id F1E72C0652 for ; Wed, 29 Jul 2026 12:28:42 +0000 (UTC) X-FDA: 85041742884.13.A721BBD Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf25.hostedemail.com (Postfix) with ESMTP id 351D6A000F for ; Wed, 29 Jul 2026 12:28:41 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=lnoL53AG; spf=pass (imf25.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@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=1785328121; 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=GJUqHVmBHSrdpuFwtI/Fi2v17xHa2F7qvwRuHwMVeOo=; b=SwNjgkCRXYrOgIDJSe978+X4eGy1aCoGq3XRbf0qxqpV7Qz07U8mdhV88V+4s+7qYjZXyb PmvVE+PWW8EDYaL+8B3v9i+5YzmkmZWYMl6XWA9V799/JYla77EX+QfbPbybpy3HOoLVcY lqidEjap4disfBy0OHXhXiybLmT2ZAE= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1785328121; b=gbu0Eh3BslrX+375RTspUNWSdhycQ6YBg6Ljb6PH5OiRpEUGUY0u9axGFI8sv85oXlPQV6 Cy549IGdg5nw3GABn5Ccuf41HeyXbD0859q8LP+PBbRoOc78Ep6FE5BfA4DlKPV/vU5nlc qN4TZeNA+rKIWyMnIu/4ByFQsHW8XxE= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=lnoL53AG; spf=pass (imf25.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8637241A16; Wed, 29 Jul 2026 12:28:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49CAD1F000E9; Wed, 29 Jul 2026 12:28:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785328118; bh=GJUqHVmBHSrdpuFwtI/Fi2v17xHa2F7qvwRuHwMVeOo=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=lnoL53AGHOGD7Ktm/BRa3X80EUt1a1uJalqZOVkPsBUp15N9D5u98FQygSc4OiK0h 26zaPVIHpcZSHz9Il7PYYic4ASze48umjeGzkC1U0Dni2dSvRgWGR8lBKH1TrzfCHU brjf7wH+BEWMnJDDDTY4yNkQNBx7lUPrkCBg1j+bFnikF+KRyAzvLAgGhSbpQQlL3j OdfJwVVhMfKugYMZrxu76fjEMFSUPQxebxip7k/KjLdJFTvfLCnmF8iI7OlDjIhgoi Vw4X+zGN0NcPIRjcWONNnPaQ0/ovroWQv5cjyTnVKSLyczn4JSc0lwlx7Jilz0k893 upQDnJt7MbvkQ== Message-ID: <31372fbd-13c8-4d6d-8a0e-faccf933d00a@kernel.org> Date: Wed, 29 Jul 2026 14:28:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 00/11] mm: distinguish PTE table storage from PTE values To: Muhammad Usama Anjum , Alexander Gordeev Cc: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Dimitri Sivanich , Arnd Bergmann , Greg Kroah-Hartman , "James E.J. Bottomley" , Helge Deller , Juergen Gross , Stefano Stabellini , Muchun Song , Oscar Salvador , Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Andrey Ryabinin , Pasha Tatashin , Chris Li , Kairui Song , Uladzislau Rezki , Steven Rostedt , Masami Hiramatsu , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , SJ Park , "Matthew Wilcox (Oracle)" , Jan Kara , Jason Gunthorpe , Leon Romanovsky , Miaohe Lin , Dennis Zhou , Tejun Heo , Christoph Lameter , Mike Rapoport , Johannes Weiner , ziy@nvidia.com, pfalcato@suse.de, ryan.roberts@arm.com, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev References: <20260727164715.2866609-1-usama.anjum@arm.com> <2c19247e-bee6-45f4-a353-2fcc60db26e6@kernel.org> <7813b5fe-e767-442c-a356-afc1a5c567ad-agordeev@linux.ibm.com> <6db0a8c0-b500-4364-be3d-d3a537c61258@kernel.org> <46319967-0338-4532-b953-dbea77084fe3@arm.com> <78a0402d-5436-4aab-a704-90fab56eec50@kernel.org> <38e14b3f-52b3-45d8-b151-776be75d44d8@arm.com> 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: <38e14b3f-52b3-45d8-b151-776be75d44d8@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 351D6A000F X-Stat-Signature: b1of8azchbzz7mhccjpeqprruiyuy7jq X-HE-Tag: 1785328121-487180 X-HE-Meta: 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 nEHoaR9V m8ghuGgimvjD+VocrEBwosZPhG1fwrYxYCTlXCUaJZGAyYgS7aYzicxqvzCI6p6s7DLBGxz6y0pRV5NC4s5PzEhjjKl/J1eC+gjkKeFHX+/VJBkJJY1bW5idGl5KTi8TRFFOemMzZKuwwLhE5HSDYeJCPidhy502Lt9DRqJBs82T6l3oFp7gPBiOKen6ZnhhOK64yawQTzTVjyEkoyOZK/DYWWIKsEe4tTst/gfnEB9aItXObfUofJEGgSGazOsOq6HWQOQhV8KFmRPlzCCh4n2OiZzG4hn+XCk7Rwwig3FVgNIFC3wLH/qWB884xFPT9Bd7e0A6WBeivx/M= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/29/26 14:21, Muhammad Usama Anjum wrote: > On 29/07/2026 12:52 pm, David Hildenbrand (Arm) wrote: >> On 7/29/26 13:33, Muhammad Usama Anjum wrote: >>> Yeah and architecture cannot opt-in until its converted. So we should leave >>> it to architecture to define hw_pte_t. >> >> In the context of this series, we should have something like an >> CONFIG_ARCH_HAS_XXX and select the definition based on that. >> >> So we'd have a generic variant. > I'll add CONFIG_ARCH_HAS_XXX config in generic version. > > I don't understand why generic code would define hw_pte_t if arch optionally > opts-in. > > Are you saying pte_t may have different definition in different arches. But > the hw_pte_t would always be structure of pte_t. Hence definition > > typedef struct { pte_t __pte; }; hw_pte_t; > > can be moved to the generic code? > > Moving definition to generic side is fine at this point in time. But if > a arch wants to hw_pte_t opaque and don't want the generic code to perform > arithmatic (ptep++), it'll not work. Yes, but we can tackle this once some arch actually needs that. For now, it makes this patch set easier to digest. -- Cheers, David