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 6868F1099B40 for ; Fri, 20 Mar 2026 22:13:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 52C486B00D2; Fri, 20 Mar 2026 18:13:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 504496B00D6; Fri, 20 Mar 2026 18:13:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 441306B00D7; Fri, 20 Mar 2026 18:13:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 3378B6B00D2 for ; Fri, 20 Mar 2026 18:13:47 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id CC5FF1B771B for ; Fri, 20 Mar 2026 22:13:46 +0000 (UTC) X-FDA: 84567844452.23.36429A3 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf11.hostedemail.com (Postfix) with ESMTP id 43A7A40007 for ; Fri, 20 Mar 2026 22:13:45 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=edSADuQC; spf=pass (imf11.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=1774044825; 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: references:dkim-signature; bh=kHeX5+YEAAQ5ktdSsuMecwqZwetnx8PqmydD5c5G9Ig=; b=c9uKBwWfVZbCyuIPYKfHcXMUARsVRwCh8sckOgWRxpQtzYeGTQjr7BikGUaastZPNg6b6g nPirLtk+iQnzzKm3AGhjM8CWxxGqDkS2rGESB5WXOwmTIQ6Z8ypNrPGrLCMKEr8zNktazZ +0So9otAQzpRszkT3r1XzzXG9EUazzg= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=edSADuQC; spf=pass (imf11.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=1774044825; a=rsa-sha256; cv=none; b=ikxa70kgEU5qjcEnRrOS6gmoVdM6zhe6t9DsSeTMOtAetn6Wrl07qkf8Z1LLFzBnb0Bgri 96skmEh+PD6i5TvxuKvJVyiVqT7FOSlxIFp0O2c3gLiWVyLexWU9EwxCT1apQyojPXFG+B Js+VxG1ZjIbrrAlGLUG6Mm/vz/qP14E= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 7EF9160128; Fri, 20 Mar 2026 22:13:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71B76C4CEF7; Fri, 20 Mar 2026 22:13:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774044824; bh=37kqOOQ/gFodAPx12yyeumULM8pbIZCoL7z8zOpqXf0=; h=From:Subject:Date:To:Cc:From; b=edSADuQC1oEMW8dWWkRDylnwWgm554uxai5oA30QCHdfBcxx4gOYFfiqWlcULOlqU ncAaN3x4odTUE7sqhieG30e+G5T5QVoPrf7LOtIJ7zwdc+jYAjo3uQVMqrNJJeh1LB DefP7y/8KZQ3EQqwTivr2WJB8+ThJMSrvnvqxjBK48P30+vR6WyYgGnKflj4PDoN20 fc+1htlMz3x4PfxkDaXOgkjLuHxDzWNJrNrvLmOg4S39caX01QjKalCc28jgt4VjTQ 9M5CShjf0Cxm8//D6d5EnadKWZp4/rpCDYo+myXErcH2J+u377GWSp5NAWjvaKVldb +dnQ/VfibsdLA== From: "David Hildenbrand (Arm)" Subject: [PATCH v2 00/15] mm: memory hot(un)plug and SPARSEMEM cleanups Date: Fri, 20 Mar 2026 23:13:32 +0100 Message-Id: <20260320-sparsemem_cleanups-v2-0-096addc8800d@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAIzGvWkC/x3MQQqEMBAF0atIrycQekTBq8ggMflqg2ZCGkUQ7 25w+RZVFymyQKmrLso4ROUfC/hTkV9cnGEkFBNbbuyXrdHksmLDNvgVLu5JjUcdwsi+bgOohCl jkvOd9r/7fgDwqvASZAAAAA== To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Oscar Salvador , Axel Rasmussen , Yuanchu Xie , Wei Xu , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Sidhartha Kumar , linux-mm@kvack.org, linux-cxl@vger.kernel.org, linux-riscv@lists.infradead.org, "David Hildenbrand (Arm)" X-Mailer: b4 0.13.0 X-Rspamd-Queue-Id: 43A7A40007 X-Stat-Signature: hersqus9mymxt9wn13d1157jjh37afux X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1774044825-449946 X-HE-Meta: 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 fqr3Q+WO LNzWq6D3fHQUmgACIrCD2N+wYjTeoHuIAx4Ru+eaKZpM2+QSgcr7JrzgZqPm1/lO9TNkpN/rAGHp0oPGa5WS216VHjV+hZMP+nheaUGI+fuuIO9c9jtNk6Tbh1+v8PJ6V/flWOdRNb2BKNiM22UY3tBnjjK7PW1GqqcRsTuZedYXA0W8p3P6iwE8PgrKlpdF9ZKQbP3dUEYO5cCTqkYCeNtXjMgHsr8HgMaZryENyBBxo6RT6vBL1+nZlUg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Some cleanups around memory hot(un)plug and SPARSEMEM. In essence, we can limit CONFIG_MEMORY_HOTPLUG to CONFIG_SPARSEMEM_VMEMMAP, remove some dead code, and move all the hotplug bits over to mm/sparse-vmemmap.c. Some further/related cleanups around other unnecessary code (memory hole handling and complicated usemap allocation). I have some further sparse.c cleanups lying around, and I'm planning on getting rid of bootmem_info.c entirely. Cross-compiled on a bunch of machines. Hot(un)plug tested with virtio-mem. v1 -> v2: * Added "mm/memory_hotplug: fix possible race in scan_movable_pages()" * Update the comment above section_deactivate() * Reordered the flags in sparse_init_one_section() * Patch description improvements --- David Hildenbrand (Arm) (15): mm/memory_hotplug: fix possible race in scan_movable_pages() mm/memory_hotplug: remove for_each_valid_pfn() usage mm/sparse: remove WARN_ONs from (online|offline)_mem_sections() mm/Kconfig: make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP mm/memory_hotplug: simplify check_pfn_span() mm/sparse: remove !CONFIG_SPARSEMEM_VMEMMAP leftovers for CONFIG_MEMORY_HOTPLUG mm/bootmem_info: remove handling for !CONFIG_SPARSEMEM_VMEMMAP mm/bootmem_info: avoid using sparse_decode_mem_map() mm/sparse: remove sparse_decode_mem_map() mm/sparse: remove CONFIG_MEMORY_HOTPLUG-specific usemap allocation handling mm: prepare to move subsection_map_init() to mm/sparse-vmemmap.c mm/sparse: drop set_section_nid() from sparse_add_section() mm/sparse: move sparse_init_one_section() to internal.h mm/sparse: move __section_mark_present() to internal.h mm/sparse: move memory hotplug bits to sparse-vmemmap.c include/linux/memory_hotplug.h | 2 - include/linux/mmzone.h | 6 +- mm/Kconfig | 2 +- mm/bootmem_info.c | 46 +--- mm/internal.h | 47 ++++ mm/memory_hotplug.c | 35 ++- mm/mm_init.c | 2 +- mm/sparse-vmemmap.c | 304 +++++++++++++++++++++++ mm/sparse.c | 539 +---------------------------------------- 9 files changed, 377 insertions(+), 606 deletions(-) --- base-commit: 3f4f1faa33544d0bd724e32980b6f211c3a9bc7b change-id: 20260320-sparsemem_cleanups-ce4ddb2c47de Best regards, -- David Hildenbrand (Arm)