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GET /api/1.2/patches/2219935/?format=api
{ "id": 2219935, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219935/?format=api", "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=api", "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=api", "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=api", "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 <linuxppc-dev+bounces-19340-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "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\" <Liam.Howlett@oracle.com>,\n\tVlastimil Babka <vbabka@kernel.org>,\n\tMike Rapoport <rppt@kernel.org>,\n\tSuren Baghdasaryan <surenb@google.com>,\n\tMichal Hocko <mhocko@suse.com>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\tChristophe Leroy <chleroy@kernel.org>,\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 <songmuchun@bytedance.com>", "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": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "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 <songmuchun@bytedance.com>\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" ] }