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 9B00237C92A for ; Wed, 5 Aug 2026 18:41:56 +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=1785955317; cv=none; b=s48i/rGLIUyS7Lxyf8m0DLOIXLgklkEtbQE6maErjDjq/Vav4wVHmoulM4iFNjbd1TaUKdteyr1qAh1uZOFm+LkzPudQpEMxyWBhR8d2AoEbcYsNf/rbPaIYgN+/BTBNKf3d5Bz4MzWbgNlpuyKOXeB6OBYXlS7mlez9lhepDAY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785955317; c=relaxed/simple; bh=eusSiQvUmBrNId9AGFiytQ01acc6pzalziovnAkwgNo=; h=Date:To:From:Subject:Message-Id; b=r5qiTFuEuy/2nsCiFmrGoe0RCE2iOS57dYURf2YHpSmVpdaLfkYclsAxV8VPc9hbLamXyy03DsGS5F4IGzlv/CfjH9AHArxXkBBFqV3FiZrMc4mwMugQGJKxfoJisWviyClYyvOrMSxlIlAk5wmKBWX5BRl/Do9f5IdIn5MV0fk= 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=SSxiEV+g; 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="SSxiEV+g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0EF1D1F00A3A; Wed, 5 Aug 2026 18:41:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1785955316; bh=efPMr3hJyYaIrLBFg12c15eOz6rt0mvG7cr2w8U4kpE=; h=Date:To:From:Subject; b=SSxiEV+gBOb2hu4SJ/tmPfHZy2g5uYXjjcJT6rYaIFFIOv/sKKgJX2x+0VptkFpwG 6L7rfq5Wpxi+ZZZI4kIsuICBx+xg3a1mzPJPzmv8PPxhkkMZeEeC4WXYrJftVvjyPX 4uCfwJu2V7vDoTA0r2koE9wwHZ37Ru86jXf76K/0= Date: Wed, 05 Aug 2026 11:41:55 -0700 To: mm-commits@vger.kernel.org,vbabka@kernel.org,surenb@google.com,rppt@kernel.org,mhocko@suse.com,ljs@kernel.org,liam@infradead.org,david@kernel.org,songmuchun@bytedance.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-sparse-keep-mem_section_usage_size-internal.patch added to mm-new branch Message-Id: <20260805184156.0EF1D1F00A3A@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: keep mem_section_usage_size() internal has been added to the -mm mm-new branch. Its filename is mm-sparse-keep-mem_section_usage_size-internal.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-keep-mem_section_usage_size-internal.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: Muchun Song Subject: mm/sparse: keep mem_section_usage_size() internal Date: Wed, 5 Aug 2026 10:25:36 +0800 mem_section_usage_size() is only needed by sparsemem implementation code after commit ae751d567baa ("mm/bootmem_info: stop marking mem_section_usage as MIX_SECTION_INFO"), so keeping the declaration in mmzone.h now exposes the helper to all mmzone.h users for no reason. Move the helper to sparse.h so sparse.c and sparse-vmemmap.c can share it through the internal header. While doing so, calculate the allocation size with struct_size_t(), which ties the expression to the pageblock_flags trailing array instead of open-coding the struct header plus bitmap size. Link: https://lore.kernel.org/20260805022536.1206575-1-songmuchun@bytedance.com Signed-off-by: Muchun Song Acked-by: Mike Rapoport (Microsoft) Acked-by: David Hildenbrand (Arm) Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- include/linux/mmzone.h | 1 - mm/sparse.c | 10 ---------- mm/sparse.h | 6 ++++++ 3 files changed, 6 insertions(+), 11 deletions(-) --- a/include/linux/mmzone.h~mm-sparse-keep-mem_section_usage_size-internal +++ a/include/linux/mmzone.h @@ -2070,7 +2070,6 @@ static inline struct mem_section *__nr_t #endif return &mem_section[root][nr & SECTION_ROOT_MASK]; } -extern size_t mem_section_usage_size(void); /* * We use the lower bits of the mem_map pointer to store a little bit of --- a/mm/sparse.c~mm-sparse-keep-mem_section_usage_size-internal +++ a/mm/sparse.c @@ -213,16 +213,6 @@ static void __init memblocks_present(voi memory_present(nid, start, end); } -static unsigned long usemap_size(void) -{ - return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long); -} - -size_t mem_section_usage_size(void) -{ - return sizeof(struct mem_section_usage) + usemap_size(); -} - #ifdef CONFIG_SPARSEMEM_VMEMMAP unsigned long __init section_map_size(void) { --- a/mm/sparse.h~mm-sparse-keep-mem_section_usage_size-internal +++ a/mm/sparse.h @@ -47,6 +47,12 @@ static inline void __section_mark_presen ms->section_mem_map |= SECTION_MARKED_PRESENT; } + +static inline size_t mem_section_usage_size(void) +{ + return struct_size_t(struct mem_section_usage, pageblock_flags, + BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS)); +} #else static inline void sparse_init(void) {} #endif /* CONFIG_SPARSEMEM */ _ Patches currently in -mm which might be from songmuchun@bytedance.com are mm-sparse-keep-mem_section_usage_size-internal.patch