{"id":2219935,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2219935/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-11-songmuchun@bytedance.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.2/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/","list_archive_url":"https://lore.kernel.org/linuxppc-dev/","list_archive_url_format":"https://lore.kernel.org/linuxppc-dev/{}/","commit_url_format":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}"},"msgid":"<20260405125240.2558577-11-songmuchun@bytedance.com>","list_archive_url":"https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-11-songmuchun@bytedance.com/","date":"2026-04-05T12:52:01","name":"[10/49] mm: move subsection_map_init() into sparse_init()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"732a0fa772b4f868d7089b1a481fe5d8edc2abab","submitter":{"id":78930,"url":"http://patchwork.ozlabs.org/api/1.2/people/78930/?format=json","name":"Muchun Song","email":"songmuchun@bytedance.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-11-songmuchun@bytedance.com/mbox/","series":[{"id":498783,"url":"http://patchwork.ozlabs.org/api/1.2/series/498783/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498783","date":"2026-04-05T12:51:51","name":"mm: Generalize vmemmap optimization for DAX and HugeTLB","version":1,"mbox":"http://patchwork.ozlabs.org/series/498783/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2219935/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2219935/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=bytedance.com header.i=@bytedance.com\n header.a=rsa-sha256 header.s=google header.b=b91g43zH;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Howlett\" ,\n\tVlastimil Babka ,\n\tMike Rapoport ,\n\tSuren Baghdasaryan ,\n\tMichal Hocko ,\n\tNicholas Piggin ,\n\tChristophe Leroy ,\n\taneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com,\n\tlinux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-kernel@vger.kernel.org,\n\tMuchun Song ","Subject":"[PATCH 10/49] mm: move subsection_map_init() into sparse_init()","Date":"Sun, 5 Apr 2026 20:52:01 +0800","Message-Id":"<20260405125240.2558577-11-songmuchun@bytedance.com>","X-Mailer":"git-send-email 2.20.1","In-Reply-To":"<20260405125240.2558577-1-songmuchun@bytedance.com>","References":"<20260405125240.2558577-1-songmuchun@bytedance.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"},"content":"Move the initialization of the subsection map from free_area_init()\ninto sparse_init(). This encapsulates the logic within the sparse\nmemory initialization code.\n\nSigned-off-by: Muchun Song \n---\n mm/internal.h | 5 ++---\n mm/mm_init.c | 10 ++--------\n mm/sparse-vmemmap.c | 11 ++++++++++-\n mm/sparse.c | 1 +\n 4 files changed, 15 insertions(+), 12 deletions(-)","diff":"diff --git a/mm/internal.h b/mm/internal.h\nindex edb1c04d0617..d70075d0e788 100644\n--- a/mm/internal.h\n+++ b/mm/internal.h\n@@ -1004,10 +1004,9 @@ static inline void sparse_init(void) {}\n * mm/sparse-vmemmap.c\n */\n #ifdef CONFIG_SPARSEMEM_VMEMMAP\n-void sparse_init_subsection_map(unsigned long pfn, unsigned long nr_pages);\n+void sparse_init_subsection_map(void);\n #else\n-static inline void sparse_init_subsection_map(unsigned long pfn,\n-\t\tunsigned long nr_pages)\n+static inline void sparse_init_subsection_map(void)\n {\n }\n #endif /* CONFIG_SPARSEMEM_VMEMMAP */\ndiff --git a/mm/mm_init.c b/mm/mm_init.c\nindex a92c5053f63d..5ca4503e7622 100644\n--- a/mm/mm_init.c\n+++ b/mm/mm_init.c\n@@ -1857,18 +1857,12 @@ static void __init free_area_init(void)\n \t\t\t (u64)zone_movable_pfn[i] << PAGE_SHIFT);\n \t}\n \n-\t/*\n-\t * Print out the early node map, and initialize the\n-\t * subsection-map relative to active online memory ranges to\n-\t * enable future \"sub-section\" extensions of the memory map.\n-\t */\n+\t/* Print out the early node map. */\n \tpr_info(\"Early memory node ranges\\n\");\n-\tfor_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {\n+\tfor_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)\n \t\tpr_info(\" node %3d: [mem %#018Lx-%#018Lx]\\n\", nid,\n \t\t\t(u64)start_pfn << PAGE_SHIFT,\n \t\t\t((u64)end_pfn << PAGE_SHIFT) - 1);\n-\t\tsparse_init_subsection_map(start_pfn, end_pfn - start_pfn);\n-\t}\n \n \t/* Initialise every node */\n \tmminit_verify_pageflags_layout();\ndiff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c\nindex 0ee03db0b22f..b7201c235419 100644\n--- a/mm/sparse-vmemmap.c\n+++ b/mm/sparse-vmemmap.c\n@@ -603,7 +603,7 @@ static void subsection_mask_set(unsigned long *map, unsigned long pfn,\n \tbitmap_set(map, idx, end - idx + 1);\n }\n \n-void __init sparse_init_subsection_map(unsigned long pfn, unsigned long nr_pages)\n+static void __init sparse_init_subsection_map_range(unsigned long pfn, unsigned long nr_pages)\n {\n \tint end_sec_nr = pfn_to_section_nr(pfn + nr_pages - 1);\n \tunsigned long nr, start_sec_nr = pfn_to_section_nr(pfn);\n@@ -626,6 +626,15 @@ void __init sparse_init_subsection_map(unsigned long pfn, unsigned long nr_pages\n \t}\n }\n \n+void __init sparse_init_subsection_map(void)\n+{\n+\tint i, nid;\n+\tunsigned long start, end;\n+\n+\tfor_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid)\n+\t\tsparse_init_subsection_map_range(start, end - start);\n+}\n+\n #ifdef CONFIG_MEMORY_HOTPLUG\n \n /* Mark all memory sections within the pfn range as online */\ndiff --git a/mm/sparse.c b/mm/sparse.c\nindex 5c12b979a618..c7f91dc2e5b5 100644\n--- a/mm/sparse.c\n+++ b/mm/sparse.c\n@@ -424,5 +424,6 @@ void __init sparse_init(void)\n \t}\n \t/* cover the last node */\n \tsparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);\n+\tsparse_init_subsection_map();\n \tvmemmap_populate_print_last();\n }\n","prefixes":["10/49"]}