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 C974FC982E1 for ; Mon, 21 Sep 2026 10:35:04 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E76C06B0095; Mon, 21 Sep 2026 06:35:03 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E26CD6B00B9; Mon, 21 Sep 2026 06:35:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D15866B00E1; Mon, 21 Sep 2026 06:35:03 -0400 (EDT) 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 B3C216B0095 for ; Mon, 21 Sep 2026 06:35:03 -0400 (EDT) Received: from smtpin14.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id BDD0F1C0210 for ; Mon, 21 Sep 2026 10:35:02 +0000 (UTC) X-FDA: 85237411644.14.DDA74F1 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf19.hostedemail.com (Postfix) with ESMTP id BD70A1A0004 for ; Mon, 21 Sep 2026 10:35:00 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=kfrmaCFp; spf=pass (imf19.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=1789986900; 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=x8KXjch4NKKbC7ef7MxukElCsyctRkNt4j8KRmbVcQs=; b=pheqCWa1ArnJA/TG/v7bfZXs5arsqDAAkONqxBtFqVnXYIyVeJYTXXRkD7pbUBXP3nqRER VXFHnVup4sCesEFexkzlOWR6PqYyKZ0lkhtx7g3HFL/LvP0XxCYtgNCi7v/ztpfC48TFhv blbYc7rXnHvrgRVtqCnekFF9cziv6rY= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789986900; b=CZzUkDuAp1MCcZNgJZi+Sin/hiaaxVTypnD3KcniiByS00VXsnX5ZyO1L8oR+hDypsQjvR QYtEvIcuZNYn9zGWr+BiwJDGy0dXcPYBNSpS9voTFaLSb9gAzu1kShDLWOG3WaLgaLRftN Dyh+zbcAajTkRseK/iYOIpmHcYq99Ew= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=kfrmaCFp; spf=pass (imf19.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 5458C417B9; Mon, 21 Sep 2026 10:34:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 466561F000FF; Mon, 21 Sep 2026 10:34:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789986899; bh=x8KXjch4NKKbC7ef7MxukElCsyctRkNt4j8KRmbVcQs=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=kfrmaCFpTGdnE2iBeUj+IC8nbqeeFbOJoF0hShp/7cIKbBMyqLj2o3c0KFnctsuAv QdAqxqCaGjUn0T7HTwG2TrF8+TGv1ftRZiR0GVgqabW2nhqqGDhgKqBCUowa5wBsYA s89KAHOKUrYwRSUfVeAfNOv+yUOnNhXVLKkrBHHFc4jJ2rZG7Fzs4W3uFHFOM1oO4c LOG8cDc/wBMUvZaLGPKJW7GsGdV2Ia3YT1yMhAyRiufyNwl8WvLQ2c1sGZ+/dQKels jshtXAv83o8A1VfettpXbdGQhiAEXPb/yVCLcZwXj4GG6Xrp1ueKjEmiAcpQBLe3yS ApsR8LouNLSPA== Message-ID: <0baf8c5f-1327-4cb1-867c-e0b08085b9d3@kernel.org> Date: Mon, 21 Sep 2026 12:34:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: Add CONFIG_SPARSEMEM_CLASSIC To: Kaitao Cheng , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andrew Morton , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Muchun Song Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Kaitao Cheng References: <20260920070406.95354-1-kaitao.cheng@linux.dev> 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: <20260920070406.95354-1-kaitao.cheng@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: BD70A1A0004 X-Stat-Signature: qnst6psmj4y1zmon9ee1xquz344tg6wn X-Rspam-User: X-HE-Tag: 1789986900-259489 X-HE-Meta: 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 oOAIgkXf zlz5oI4cgtYbplImrKqBQFaQaFwVYoFjaG93a5fT5Z+7ztnA6/+lM1+kJL6ZqX7yv/RYcsgXAH5PCkhCmGyLmkw7gUvvOjXpbg1x9KJSsdTH5rjQeuYtCXBj1YWv6CfNFpnQnlOLoA8C6JZHLuwGBOtyjldWWuNMGgE9sGzXRMmDGaMv1yKDvcJ1IBI7cgvqpCtVT+ivg04wZ89YXhhgH4WLRE9Ij1Xj9+NPlJ9xghFeYCyabAzH/I5Zg8OiOY41ZY4ZZOTbIiXHnTL8zHbJhN6OFesH8s7qfao98TnYzGZMZK4bgB9kcnJ71pQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/20/26 09:04, Kaitao Cheng wrote: > From: Kaitao Cheng > > Several MM paths identify classic sparse memory by testing > CONFIG_SPARSEMEM while also testing that CONFIG_SPARSEMEM_VMEMMAP is > disabled. Repeating the compound condition obscures the memory model being > selected and requires the local SECTION_IN_PAGE_FLAGS alias for the same > state. > > Add CONFIG_SPARSEMEM_CLASSIC as a hidden derived option and use it at the > conditional sites. Remove SECTION_IN_PAGE_FLAGS and test the new option > directly. Sorry, but reading CONFIG_SPARSEMEM_CLASSIC I would have no idea how it relates to VMEMMAP. CONFIG_SPARSEMEM && !CONFIG_SPARSEMEM_VMEMMAP is pretty clear in comparison. -- Cheers, David