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 C8E39381E97 for ; Thu, 10 Sep 2026 23:05:29 +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=1789081531; cv=none; b=ExC1VcRqsC4g0eyEzycPELJ0TiMVovyZ9cA1AYWxby0r/mtK6aACvNkvYHcWmeCt6wcnFBc60m4k72x1kS00okAKyhBYifP1fdlJ/mFS4V+/sn2ZNwxtk1Iu2mp/q/VrJRGIxzRk0WHuk5zXCEvITQrb8VDPk7CBuXQl7Duv8G0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789081531; c=relaxed/simple; bh=hEhfTNbthslBbaLJ9YT80J2GPL5Jqqn6a14EXHsSVQo=; h=Date:To:From:Subject:Message-Id; b=Wj130E8k+Hwt5yp2hfH0GuckSPON385hfI+eqwwFcsdGhmCO2R/M1ZrYGHKzbeoU8VCHFjn329fDoBIiaDLsILwphzbECpYyiw/GQRkr++EXiN0VcRKa1emm/t0E3voN/x3SgISCGJZcfC6ZgLFognSup4ENjeNdLb8UoQLM+y4= 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=aXNh/wTH; 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="aXNh/wTH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC3F41F000FF; Thu, 10 Sep 2026 23:05:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789081528; bh=mRCGIDWIz6RZHHzb3xumo1N3DyOUDcyP7KEkjeWu1YE=; h=Date:To:From:Subject; b=aXNh/wTH2lUzTIhIqa1D733UYxyr+y5IN3JjZ/gUodvjhflxuC8FTEf661wdNfg0L KgEb0sy3xtVACBqmz6hnyqNDuTGEd+IffHanVrza6pMGo37/gj4/E1JBf6ErkEYq3a 7j53LkPzMOgsaIg0Z+8TO7HgTqArjTqucxmQRqNM= Date: Thu, 10 Sep 2026 16:05:28 -0700 To: mm-commits@vger.kernel.org,songmuchun@bytedance.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-sparse-initialize-memory-sections-earlier.patch added to mm-unstable branch Message-Id: <20260910230528.BC3F41F000FF@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: initialize memory sections earlier has been added to the -mm mm-unstable branch. Its filename is mm-sparse-initialize-memory-sections-earlier.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-initialize-memory-sections-earlier.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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: Muchun Song Subject: mm/sparse: initialize memory sections earlier Date: Thu, 10 Sep 2026 14:32:48 +0800 Upcoming HugeTLB bootmem changes need sparsemem section metadata before the HugeTLB bootmem allocation path runs. The memory sections are initialized from sparse_init(), which is called too late for that setup. Move the code that initializes sparsemem section metadata for memblock ranges into mm_core_init_early(), before free_area_init() and the HugeTLB bootmem setup. Rename the helper to sparse_sections_init() so the new caller describes the sparsemem-specific initialization step. This is a preparatory change. Link: https://lore.kernel.org/20260910063256.64386-10-songmuchun@bytedance.com Signed-off-by: Muchun Song Reviewed-by: Mike Rapoport (Microsoft) Acked-by: Qi Zheng Cc: David Hildenbrand (Arm) Cc: David Laight Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Oscar Salvador Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/mm_init.c | 1 + mm/sparse.c | 9 +-------- mm/sparse.h | 2 ++ 3 files changed, 4 insertions(+), 8 deletions(-) --- a/mm/mm_init.c~mm-sparse-initialize-memory-sections-earlier +++ a/mm/mm_init.c @@ -2642,6 +2642,7 @@ void __init mm_core_init_early(void) { kho_memory_init_early(); + sparse_sections_init(); free_area_init(); hugetlb_cma_reserve(); --- a/mm/sparse.c~mm-sparse-initialize-memory-sections-earlier +++ a/mm/sparse.c @@ -191,12 +191,7 @@ static void __init memory_present(int ni } } -/* - * Mark all memblocks as present using memory_present(). - * This is a convenience function that is useful to mark all of the systems - * memory as present during initialization. - */ -static void __init memblocks_present(void) +void __init sparse_sections_init(void) { unsigned long start, end; int i, nid; @@ -322,8 +317,6 @@ void __init sparse_init(void) unsigned long pnum_end, pnum_begin, map_count = 1; int nid_begin; - memblocks_present(); - if (compound_info_has_mask()) { VM_WARN_ON_ONCE(!IS_ALIGNED((unsigned long) pfn_to_page(0), MAX_FOLIO_VMEMMAP_ALIGN)); --- a/mm/sparse.h~mm-sparse-initialize-memory-sections-earlier +++ a/mm/sparse.h @@ -59,6 +59,7 @@ static inline bool vmemmap_optimizable_o */ #ifdef CONFIG_SPARSEMEM void sparse_init(void); +void sparse_sections_init(void); int sparse_index_init(unsigned long section_nr, int nid); static inline void sparse_init_one_section(struct mem_section *ms, @@ -104,6 +105,7 @@ static inline bool section_vmemmap_optim } #else static inline void sparse_init(void) {} +static inline void sparse_sections_init(void) {} #endif /* CONFIG_SPARSEMEM */ /* _ Patches currently in -mm which might be from songmuchun@bytedance.com are mm-sparse-relax-struct-mem_section-size-constraints.patch mm-sparse-vmemmap-rename-hvo-order-macros.patch mm-mm_init-skip-initializing-shared-vmemmap-tail-pages.patch mm-sparse-vmemmap-initialize-shared-tail-vmemmap-pages-on-allocation.patch mm-sparse-vmemmap-support-section-based-vmemmap-accounting.patch mm-mm_init-factor-out-pfn_to_zone.patch mm-sparse-vmemmap-move-helpers-ahead-of-future-callers.patch mm-sparse-vmemmap-support-section-based-vmemmap-optimization.patch mm-sparse-initialize-memory-sections-earlier.patch mm-hugetlb-switch-hugetlb-to-section-based-vmemmap-optimization.patch mm-sparse-vmemmap-remove-sparsemem_vmemmap_preinit-support.patch mm-sparse-inline-usemap-allocation-into-sparse_init_nid.patch mm-sparse-remove-section_map_size.patch mm-hugetlb-remove-huge_bootmem_hvo.patch mm-hugetlb-remove-huge_bootmem_cma.patch mm-hugetlb-localize-struct-huge_bootmem_page.patch mm-hugetlb-localize-huge_bootmem_zones_valid.patch mm-sparse-vmemmap-introduce-config_sparsemem_vmemmap_optimization.patch mm-sparse-vmemmap-factor-out-shared-vmemmap-tail-page-allocation.patch mm-sparse-vmemmap-open-code-init_compound_tail.patch mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-section-orders.patch mm-sparse-vmemmap-set-section-order-for-device-dax.patch mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages.patch mm-sparse-vmemmap-move-hvo-helpers-to-a-public-header.patch powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages.patch mm-sparse-vmemmap-drop-the-extra-tail-page-from-device-dax-reservation.patch mm-sparse-vmemmap-drop-unused-section_nr_vmemmap_pages-arguments.patch documentation-mm-update-dax-vmemmap-deduplication-docs.patch