From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 044293ED3B4 for ; Mon, 21 Sep 2026 22:49:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790030976; cv=none; b=QbWmi5k3MMS8wMPffZzn5LIee/OBiMtA4YvoNy1Wxb+2f7SqGs4Tcsf8BM9IhZU9SwmjYKdQJR2zFbIbOC14s1iFE2ZDSQerdT7Og24+r1M6urlQbHC6gunTmusD1ug/QXJGwjZU86HGHKZ9WOXVEH2MUXl5qv/yCrlQiNfnEAw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790030976; c=relaxed/simple; bh=zb0qinRzIOjwvSZWmPvkOSmWQ9cDx2q5+BQYn8FydUc=; h=Date:To:From:Subject:Message-Id; b=Oj2fkOv8/Ib1HZC2nWsfGdCBIOmUL6bKSWlj4kiufO+266jWxqlkriOwmIo2DYfzUz/wlVcNoxIRS5AKxMzGgMC4CbTztHqMcixgAnT6yhZPuI/mLPPhcQiEXyGcfFV0yLIS9rFTXQdorpUJYRqz/Tm3I8f3fYX5s/VbL0GWRVU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=eSSN1sG+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="eSSN1sG+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C0CC1F000FF; Mon, 21 Sep 2026 22:49:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790030974; bh=MvgFFcoDcgk9/HsEoR/K454ln9bJHqsunwWd9Q4FUU4=; h=Date:To:From:Subject; b=eSSN1sG+PxaKjx2LNvsxHLqc1r3WfGJ5xA0OFOebaNp6fQcSw6zUcOAuQ8ZoZvMMp fnWprNw4fW9moDqjTiluNmSwnhvsjAFrMT18Wfj//wuTrZaDFmwOwDTpGR2Ul/1V2Z uRLo/NNcD6S7FA49//UJLDCHG0zQ2Ylf9O26gPN4= Date: Mon, 21 Sep 2026 15:49:34 -0700 To: mm-commits@vger.kernel.org,david@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-sparse-move-initialization-of-section-metadata-to-sparse_metadata_init.patch added to mm-new branch Message-Id: <20260921224934.6C0CC1F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/sparse: move initialization of section metadata to sparse_metadata_init() has been added to the -mm mm-new branch. Its filename is mm-sparse-move-initialization-of-section-metadata-to-sparse_metadata_init.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-move-initialization-of-section-metadata-to-sparse_metadata_init.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: "David Hildenbrand (Arm)" Subject: mm/sparse: move initialization of section metadata to sparse_metadata_init() Date: Mon, 21 Sep 2026 21:58:55 +0200 Let's move the code responsible for initializing sparse metadata (usemap, memmap) into a helper. Cleanup the variable while at it (e.g., "map_count"). Drop the rather obvious code comments. No functional change intended. Link: https://lore.kernel.org/20260921-b4-sparsemem_cleanups-v2-3-54d81d65e125@kernel.org Signed-off-by: David Hildenbrand (Arm) Signed-off-by: Andrew Morton Acked-by: Oscar Salvador Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: Mike Rapoport (Microsoft) Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Kairui Song Cc: Qi Zheng Cc: Shakeel Butt Cc: Barry Song Cc: Axel Rasmussen Cc: Yuanchu Xie Cc: Wei Xu Cc: Baoquan He Cc: Baolin Wang Cc: Brendan Jackman Cc: Johannes Weiner Cc: Zi Yan Cc: Jan Kiszka Cc: Kieran Bingham Cc: Greg Kroah-Hartman Cc: Rafael J. Wysocki Cc: Danilo Krummrich --- mm/sparse.c | 43 ++++++++++++++++++++++--------------------- 1 file changed, 22 insertions(+), 21 deletions(-) --- a/mm/sparse.c~mm-sparse-move-initialization-of-section-metadata-to-sparse_metadata_init +++ a/mm/sparse.c @@ -255,38 +255,39 @@ static void __init sparse_init_nid(int n } } +static void __init sparse_metadata_init(void) +{ + unsigned long start_section_nr = first_present_section_nr(); + int nid_begin = sparse_early_nid(__nr_to_section(start_section_nr)); + unsigned long section_nr, nr_sections = 1; + + for_each_present_section_nr(start_section_nr + 1, section_nr) { + const int nid = sparse_early_nid(__nr_to_section(section_nr)); + + if (nid == nid_begin) { + nr_sections++; + continue; + } + sparse_init_nid(nid_begin, start_section_nr, section_nr, nr_sections); + nid_begin = nid; + start_section_nr = section_nr; + nr_sections = 1; + } + sparse_init_nid(nid_begin, start_section_nr, section_nr, nr_sections); +} + /* * Allocate the accumulated non-linear sections, allocate a mem_map * for each and record the physical to section mapping. */ void __init sparse_init(void) { - unsigned long pnum_end, pnum_begin, map_count = 1; - int nid_begin; - if (compound_info_has_mask()) { VM_WARN_ON_ONCE(!IS_ALIGNED((unsigned long) pfn_to_page(0), MAX_FOLIO_VMEMMAP_ALIGN)); } - pnum_begin = first_present_section_nr(); - nid_begin = sparse_early_nid(__nr_to_section(pnum_begin)); - - for_each_present_section_nr(pnum_begin + 1, pnum_end) { - int nid = sparse_early_nid(__nr_to_section(pnum_end)); - - if (nid == nid_begin) { - map_count++; - continue; - } - /* Init node with sections in range [pnum_begin, pnum_end) */ - sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); - nid_begin = nid; - pnum_begin = pnum_end; - map_count = 1; - } - /* cover the last node */ - sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); + sparse_metadata_init(); sparse_init_subsection_map(); vmemmap_populate_print_last(); } _ Patches currently in -mm which might be from david@kernel.org are maintainers-split-up-memory-management-memory-policy-and-migration.patch maintainers-move-memory-tiering-under-memory-management-numa-placement.patch maintainers-make-gregory-a-co-maintainer-of-memory-management-numa-placement.patch selftests-mm-khugepaged-remove-str_dup-usage.patch mm-sparse-move-mem_section-init-to-sparse_extreme_init.patch mm-sparse-refactor-sparse_sections_init.patch mm-sparse-move-initialization-of-section-metadata-to-sparse_metadata_init.patch mm-sparse-rename-and-cleanup-sparse_init_nid.patch mm-sparse-cleanup-sparse_init_one_section.patch mm-sparse-rename-__highest_present_section_nr-to-__highest_used_section_nr.patch mm-sparse-remove-pfn_in_present_section.patch mm-sparse-move-__highest_used_section_nr-handling.patch scripts-gdb-mmpy-remove-fallbacks-for-section_has_mem_map-and-section_is_early.patch mm-sparse-remove-section_marked_present.patch mm-sparse-remove-flags-parameter-from-sparse_init_one_section.patch fs-proc-page-clarify-comment-in-get_max_dump_pfn.patch mm-memory_hotplug-drop-config_have_arch_pfn_valid-handling-from-pfn_to_online_page.patch