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 73D93EB48EA for ; Thu, 12 Feb 2026 08:58:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B284D6B0005; Thu, 12 Feb 2026 03:58:46 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id ADFB76B0089; Thu, 12 Feb 2026 03:58:46 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9E20A6B008A; Thu, 12 Feb 2026 03:58:46 -0500 (EST) 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 8BA056B0005 for ; Thu, 12 Feb 2026 03:58:46 -0500 (EST) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id EE03EBB08C for ; Thu, 12 Feb 2026 08:58:45 +0000 (UTC) X-FDA: 84435204210.26.1D48A02 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf17.hostedemail.com (Postfix) with ESMTP id 2FD5C4000A for ; Thu, 12 Feb 2026 08:58:44 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=HT5R6kpv; spf=pass (imf17.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=1770886724; 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=YDZYxDalqWS4jpiN6DyzwpwDXVyHMVpKrE+0rILK6hg=; b=0f6//u3UjNxPgPS5ugHPzVE+G8PmNq5alLmkokSmyA/0jTncTFjso+SQa7c6DK4xjr6XWq +70TVbIhCAwmyBe8ej+K+UpItp6N0+YlNGI50VPHPh4NZtPpeDpQClj8V4RezsVGvMUb2i yRI1CXin2yUjC3RLZhL/pr0XiI6wRHc= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=HT5R6kpv; spf=pass (imf17.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-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1770886724; a=rsa-sha256; cv=none; b=1iaahUfVfUaK5UwbUD63xAIU+qlZMiDHUYhrCDnTbyB9K4MAc3/UJ2Av9/TO4WyFedl4CB c9m52fIGkUil9CRItglWLTZVcFkTHvV6Gs9vdtuKJQyXp18e9+iqWdgGO3fKKfzMO9SCWS 0CDvEUCeRYwqdU3WUOeYzUvtLcjP4Pg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 7B62960128; Thu, 12 Feb 2026 08:58:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0155DC16AAE; Thu, 12 Feb 2026 08:58:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770886723; bh=O72aDxD0jjZlGGwbJFSDSKCAXe0FHSLzulcP/3B+3gA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=HT5R6kpvSukfg5IN9nlS4YbpAP2leknMovU4Qa/hAHCkiDLHNZCK/gaEeXQHxyP1T EeaWGdiI6XLZNPc7qylXP4VxUBbfiWCiPR0OOrU3ukw4sHt8o/tbgJHm1EXYuVKv5l TBZNfkmh8mxb3m+xGctyA2sWLPBXy+8bVH6k/ChG6pgU9xLYtMCirmrNSdekZUSMr1 rcLqmGD6U2Zf3RltXhzmv3O0aVtAoGjJuEnP61CUcxzzuUEYvxoWOwO1f80x8bs6UX gPY2bh3g5BAn1TNdodmkMMpjKpSAgB1l7qIcZJmbGe5SiaAuLLViJ5jFEfzgOeHrZb 3ef+PtYkktc6A== Message-ID: Date: Thu, 12 Feb 2026 09:58:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/4] mm: don't special case !MMU for is_zero_pfn() and my_zero_pfn() To: Mike Rapoport , Andrew Morton Cc: Andreas Larsson , Borislav Petkov , Brian Cain , Catalin Marinas , "Christophe Leroy (CS GROUP)" , "David S. Miller" , Dave Hansen , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Magnus Lindholm , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Michal Simek , Palmer Dabbelt , Richard Weinberger , Russell King , Stafford Horne , Suren Baghdasaryan , Thomas Gleixner , Vineet Gupta , Vlastimil Babka , Will Deacon , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org References: <20260211103141.3215197-1-rppt@kernel.org> <20260211103141.3215197-2-rppt@kernel.org> 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: <20260211103141.3215197-2-rppt@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 2FD5C4000A X-Stat-Signature: 9dr9uz6jdiaugjj7rmc4k85jf7pzufpb X-Rspam-User: X-HE-Tag: 1770886724-463288 X-HE-Meta: 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 7lKKWEal IN+fSVVjaoqnYGk5TuwnJM4Yvaq3nUHeqMRXRzECiadTh/zc9ONFcWWQ98xPhdkZlVpdYX5UJNZ58xRTPgYZTYgBllSOeg0B8vcoLMQFgOwKS1fgSmuvTl7mZKbcp4a6M+fYZ2mipLDd1FIo2KZjjAishr9q4u7P/8g3UadXL3cCkRLkWZvRXmWMgAQQqEg4HX2p0LiEgzQhF1klsAumdw9IYerleSS4eweDtweGPV8O52xrq5kb8fCJ/xJVCJPO3SLTy03hcxdG4L/P9rUTvUPYHbBSeRW1nIi0Az8yVQ/MDHfb7/3mcnZNT1ESLhz9oo+iteKYcLc1OvSRGxrGSc4GuMEoqlACAlJIfl+4ohyR0Uzys0/QeeZdDAQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/11/26 11:31, Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > nommu architectures have empty_zero_page and define ZERO_PAGE() and > although they don't really use it to populate page tables, there is no > reason to hardwire !MMU implementation of is_zero_pfn() and my_zero_pfn() > to 0. > > Drop #ifdef CONFIG_MMU around implementations of is_zero_pfn() and > my_zero_pfn() and remove !MMU version. > > While on it, make zero_pfn __ro_after_init. > > Signed-off-by: Mike Rapoport (Microsoft) > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David