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 C36FA3ED3B4 for ; Mon, 21 Sep 2026 22:49:32 +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=1790030974; cv=none; b=K/4bRbuxD74gF9uG6uvCcx/MJrhByR4d1NrxSozjI+U2QbXkKaMHm5jMb6gp0j6ZmM7q3Qeufx2JprJT/brMiUFTydA/VwGh+nSJ/EmpDquLFaL0slzxWQzaIIdOg47Ha2SfzwpJ+orRchdHvYxUeUpXikAr9tHW3MGuFhB5lTw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790030974; c=relaxed/simple; bh=ie59aupRYZl2w3gPN7uoXn2Ulv+DyEWwzjrC/bZK+HI=; h=Date:To:From:Subject:Message-Id; b=excb5GN1rm6Hdtgvipyea6koz2u/V/1dmxeDjfGd0+VBE4ep4WCy3gi/XFcVhkCaFrUAfRvwiyvWp1l067RMGW/QI5GEPBgB7K7nbFNZtHflYdLa71Vp1H/BLjakq+s3UgBoGpGcv0ARCaK8fK8ewB1pj2ZkRcBTvUtooH5UXK4= 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=pscOJZTh; 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="pscOJZTh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85A6F1F000FF; Mon, 21 Sep 2026 22:49:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790030972; bh=vPv7jbYlj5mD3Y6213XO/xUG2uiuGHW5wD8GyvzmUDY=; h=Date:To:From:Subject; b=pscOJZTh/kDM9G79bifKvDN2y0eeId+LIKjDem5MUhL5wxdFqKM9fMg38iXxthdC/ xXmdYVuHwWWn/NOXtGhTnfHx8BtpyIvHrf6IxNwsBAmuRx208X3QPyFTiqOrYZz9jx 5Jt0cdnUt9yluROw7sBhC+lWcsAlE+My6+9Nha4Q= Date: Mon, 21 Sep 2026 15:49:32 -0700 To: mm-commits@vger.kernel.org,david@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-sparse-refactor-sparse_sections_init.patch added to mm-new branch Message-Id: <20260921224932.85A6F1F000FF@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: refactor sparse_sections_init() has been added to the -mm mm-new branch. Its filename is mm-sparse-refactor-sparse_sections_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-refactor-sparse_sections_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: refactor sparse_sections_init() Date: Mon, 21 Sep 2026 21:58:54 +0200 memory_present() really identifies+prepares all early sections so the initialization in sparse_init() can properly iterating them to initialize metadata. Let's just inline memory_present() into sparse_sections_init() and cleaning up the code a bit while at it: make it clear that we are operating on pfns. Note that we call set_section_nid() now only if the section was not already created earlier. Now, there is no more inconsistency between what we (temporarily) store in ms->section_mem_map and what we store in our section->nid array. Link: https://lore.kernel.org/20260921-b4-sparsemem_cleanups-v2-2-54d81d65e125@kernel.org Signed-off-by: David Hildenbrand (Arm) Signed-off-by: Andrew Morton Acked-by: Oscar Salvador Acked-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 | 41 +++++++++++++++++------------------------ 1 file changed, 17 insertions(+), 24 deletions(-) --- a/mm/sparse.c~mm-sparse-refactor-sparse_sections_init +++ a/mm/sparse.c @@ -179,40 +179,33 @@ static inline unsigned long first_presen return next_present_section_nr(-1); } -/* Record a memory area against a node. */ -static void __init memory_present(int nid, unsigned long start, unsigned long end) +void __init sparse_sections_init(void) { - unsigned long pfn; + unsigned long pfn, start_pfn, end_pfn; + int i, nid; - start &= PAGE_SECTION_MASK; - mminit_validate_memmodel_limits(&start, &end); - for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { - unsigned long section_nr = pfn_to_section_nr(pfn); - struct mem_section *ms; + sparse_extreme_init(); - sparse_index_init(section_nr, nid); - set_section_nid(section_nr, nid); + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { + start_pfn &= PAGE_SECTION_MASK; + mminit_validate_memmodel_limits(&start_pfn, &end_pfn); + + for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { + unsigned long section_nr = pfn_to_section_nr(pfn); + struct mem_section *ms; + + sparse_index_init(section_nr, nid); + ms = __nr_to_section(section_nr); + if (ms->section_mem_map) + continue; - ms = __nr_to_section(section_nr); - if (!ms->section_mem_map) { + set_section_nid(section_nr, nid); ms->section_mem_map = sparse_encode_early_nid(nid) | SECTION_IS_ONLINE; __section_mark_present(ms, section_nr); } } } - -void __init sparse_sections_init(void) -{ - unsigned long start, end; - int i, nid; - - sparse_extreme_init(); - - for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) - memory_present(nid, start, end); -} - #ifndef CONFIG_SPARSEMEM_VMEMMAP struct page __init *__populate_section_memmap(unsigned long pfn, unsigned long nr_pages, int nid, struct vmem_altmap *altmap, _ 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