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 65584C79FBF for ; Thu, 10 Sep 2026 11:06:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 68E106B0095; Thu, 10 Sep 2026 07:06:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 666386B009B; Thu, 10 Sep 2026 07:06:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 583346B009D; Thu, 10 Sep 2026 07:06:31 -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 2F57B6B0095 for ; Thu, 10 Sep 2026 07:06:31 -0400 (EDT) Received: from smtpin08.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 7F850A0463 for ; Thu, 10 Sep 2026 11:06:30 +0000 (UTC) X-FDA: 85197574140.08.3905502 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf04.hostedemail.com (Postfix) with ESMTP id C69204000B for ; Thu, 10 Sep 2026 11:06:28 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=mQv2gG38; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 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=1789038388; 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=aSzot3DdFbH1bRFQSRCfhn2f59lhOlsZ9OER6ann7aY=; b=C+bc46iMHP2dWXbjBsNxHKiXMC7msqPs5lwiu7gKMmuiYVnuHx+rgQPAGbd5Ef2VOLWtNa ll/hSopFTeulh6mabdVwANQyIh3VP8+y3ETS6bD7Z9hvs9fh5ezfv8fv4+Ge7YvHF+UnXq e0hu4QchqhnSQcLMlZqfyenKwFwMIec= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789038388; b=gXqK+9GtJeLccp/oGmfJZZpXS+v8g8E7+aaReS2IlH5bMrPpzlqW6imPxJdluH+sm0XfC9 V41+QdSs/bvzI9n61s3JUI2iX7HgEZpro1uQGn50kHvemDqgRM/hVbWJtqOiXCn6HH3dir d9AsxZ/JvIJVAhU7Dxwqjf90CkRzSeo= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=mQv2gG38; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 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 tor.source.kernel.org (Postfix) with ESMTP id 4FE3E600C8; Thu, 10 Sep 2026 11:06:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A6A41F000FF; Thu, 10 Sep 2026 11:06:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789038388; bh=aSzot3DdFbH1bRFQSRCfhn2f59lhOlsZ9OER6ann7aY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=mQv2gG38DwhMioaZmlIihIcjXe1Of5Jx+44aRzTJ7yCvrfUER/jT5PGZkk3aEJsQz llwtEXey3grPl6cC3wlGm0pKh6qiIagIhA1kT8ncfBECmjszoV3jvYwo3C6HRpyKYJ IxzMP1ztXCx65ZtCGuluQ74gXB0ikTuy5CMNpTKt7Hj3lc7snpjLPDVvVz8o7RGfpK aMLsUAPj5Lib6dfiMXITwQJqBXtJOt5KnkAYdW/HPKreE6hr86GiEVwcrUvadtTDp0 sgyMRboqSRuMrQQ78cLql5iy2T3CcddcS2Apy/HsfrlAkalTppILCGhN2j6p3nJWkH RwmkTeY7ro+aQ== Message-ID: <10eb16d9-df86-4116-9b54-4327bb1d55bd@kernel.org> Date: Thu, 10 Sep 2026 13:06:12 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v3 14/21] x86: mm: carve out the generic compile-time folded pgtable case in effective_prot() To: Yeoreum Yun , Russell King , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Catalin Marinas , Will Deacon , Arnd Bergmann , Andrew Morton , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Johannes Weiner , Michal Hocko , Lorenzo Stoakes , Tianrui Zhao , Bibo Mao , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-openrisc@vger.kernel.org References: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@arm.com> <20260902-dummy_ptxp3-v3-14-5d8f5b17c25c@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: <20260902-dummy_ptxp3-v3-14-5d8f5b17c25c@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: u5ejd79uxoggb5t3xbngtjc8ro5t7p1i X-Rspam-User: X-Rspamd-Queue-Id: C69204000B X-Rspamd-Server: rspam03 X-HE-Tag: 1789038388-294207 X-HE-Meta: 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 iBl0DhqH y92l55XqKdyRyWSB8g6hvNNkEQNO3EySbc+QD5vmOU5S0roc3umD9ix5gRxPFCWUKVruNAMpKsxVXIFNGSIRrPIuKz4Tzim+LkUMycBLQY9roiqqytVxa21jZxExZlRh7aSQeMm7bQYjXKlGWlxhfyWp93KM6hMmb4LbqJJWZxoafbdgfU7cGSlP5Ya0gW38qt899B4wk6FXN32D/vRuiIcoxItXfPGivYXcxAYSWlosOufR2MsegU3OohGB3AG4lGWjwqREqCUgZ1apKOhEDPud5edjC6fHF/Ls+KrewXOhPiEFFcBCAPZc0Og94PrFTfo0mxvxBZXRoQUyGY0Q5Dh9FqQEBxmeukGix6D3fW/srERSO9NFzQApHEWTbjJJOZkMnKCNAnMuwdz8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/2/26 13:56, Yeoreum Yun wrote: > The behaviour of pXdp_get() will change with generic compile-time folded > page tables. To prepare for that, rework effective_prot() to ignore any > folded page tables entries, as it will unconditionally get called by > ptdump core with pXd_val(pXdp_get()), and the value for folded entries > really should be ignored. > > For this, introduce mm_first_pgtable_level() to identify the first real > page-table level, move mm_pXd_folded() in !__ASSEMBLER__ and > update effective_prot with higher_prot only when the current entry is not > folded nor the first level. > > There should be no functional change. > > Signed-off-by: Yeoreum Yun Reviewed-by: David Hildenbrand (Arm) -- Cheers, David