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 96E101091903 for ; Thu, 19 Mar 2026 18:09:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D7A346B0095; Thu, 19 Mar 2026 14:09:13 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D51F16B009B; Thu, 19 Mar 2026 14:09:13 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C67C56B009E; Thu, 19 Mar 2026 14:09:13 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id B77946B0095 for ; Thu, 19 Mar 2026 14:09:13 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 837071A0687 for ; Thu, 19 Mar 2026 18:09:13 +0000 (UTC) X-FDA: 84563599386.22.F6DC4C7 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf03.hostedemail.com (Postfix) with ESMTP id AC67820002 for ; Thu, 19 Mar 2026 18:09:11 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=qX+5ATXa; spf=pass (imf03.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=1773943751; 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=s0/Rtf4mdU/0HDs0A9SNaDuzgSU+uL/VU12OEEC0CB8=; b=vXvP2GjsK8ThL3yy3n3keClM2JCa/uGk6wH0Whndvnn7yVyksqw17n/n5BJdwgq84VMgB2 l4zjcxb/uFmRWYbTSyuO5auD+RXErbP2dyaSwmZDo8RI5Uh3BKLQVpqQce7lANG6G9u2oz 8ms6z1j+Tv53uN9c/gD6+AqRengzdFs= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1773943751; a=rsa-sha256; cv=none; b=bY9ge/O8eIjTVBe6hwDdEGRIIVgGf6mfBWPOWE+j25UmcSqbf4CH/GnCtioyV2AKAYSuu9 bgvzIv5csl7Cw3euVHQEPNxSETa2Byp0K+ZNprem3A0Y/3hC4MHyNY9JfzDxK3um0FHJFd HtbkntNmTxw6ZMsauszAkHsR/EaJpCs= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=qX+5ATXa; spf=pass (imf03.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 (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 52D3B434F6; Thu, 19 Mar 2026 18:09:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 957E3C19424; Thu, 19 Mar 2026 18:08:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773943750; bh=6e0EEIIbFUQq892CEmzGoS89gmnjToRL3GjT58TAgu0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qX+5ATXaTeCVWnoq1pb3+DCvmHvgnPIAYR73j5oOUNNdhwJKMvxcxvMznp8qHd0GX xv9Nr4ET8PVsG4aPWJihjD17Yv4iSbwgqNwABsBQW9fob6yyIX9OL4T2HWsZX6uCus TFTxhLxBv3my3hJsS7WCE9HsFSKoBMrCM00nIZRsc3Cjm5vt8s5urJsnDYrzNSpl5W iLWAQ195xdMWcV+3wWlfcPK8SqBN9pQvzG7SgVOkmXFjAbrbNl7km4EVw8CntlIph+ dgN4D/4rF2yXtEVk2ehm0cNMmvNiiHv2w0hPJ/ndW32TV+0f0DlGB7PdfcvTzv01cO LSmnz5V9S1qOw== Message-ID: Date: Thu, 19 Mar 2026 19:08:57 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE To: Gregory Price Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , 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 , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Ying Huang , Alistair Popple , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev References: <20260319-config_migration-v1-0-42270124966f@kernel.org> <20260319-config_migration-v1-1-42270124966f@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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: jdh3i95enxowxypgitgazjqjyczx9e63 X-Rspamd-Queue-Id: AC67820002 X-Rspamd-Server: rspam03 X-HE-Tag: 1773943751-886835 X-HE-Meta: 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 a7NKFwKs SfO9tm9TmjPJxqIj+2LM3zkICmK9BW4EkhLoFFQHf/n++zE+M77SBykRPP/rmU8w1r8kcNeS4dz2nDhKRLQwgclJmx7dFDu8JZNZBngxqYfo+zXJqHU4BS+6iQVGSvLH6NuewsSrPk+q7l4MWinh6Uy37jDXANUb7fwT7syOOO8g004eqVNyFh4VqFfHkVAG9EDdJs0YXrHqe8jHxPjI5d7L3OEKHBEnTR/VlQhMcuWSHWpMwpXd80khetO6r0uJW6JxLR7QI6ivsub+EZICWW0DKISdONFhqGhLzCVLTJg+vOv2OVNAS1Zn0y2h15YaPkGkv3kbP8bGd+eEDf7Prn0aw6C+SHd4e0QmwohZ3dY3esuCX63f7R/Ercx9iYpur7MuHO+nrjjeD+eRdUo7zo/B6mw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/19/26 16:24, Gregory Price wrote: > On Thu, Mar 19, 2026 at 09:19:40AM +0100, David Hildenbrand (Arm) wrote: >> All architectures that select CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE also >> select CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG. So we can just remove >> CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE. >> >> For CONFIG_MIGRATION, make it depend on CONFIG_MEMORY_HOTREMOVE instead, >> and make CONFIG_MEMORY_HOTREMOVE select CONFIG_MIGRATION (just like >> CONFIG_CMA and CONFIG_COMPACTION already do). >> >> We'll clean up CONFIG_MIGRATION next. >> >> Signed-off-by: David Hildenbrand (Arm) > > HOTREMOVE has long been a thorn in my side, I appreciate you cleaning > this up. On a long cardrive today I was wondering: do we still need a separate MEMORY_HOTREMOVE Now we'll have config MEMORY_HOTREMOVE bool "Allow for memory hot remove" select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64) depends on MEMORY_HOTPLUG select MIGRATION I'll try to get rid of that HAVE_BOOTMEM_INFO_NODE shite next. Then it's really just MIGRATION and some sprinkled CONFIG_MEMORY_HOTREMOVE. Not a lot of code. -- Cheers, David