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GET /api/1.2/patches/2219955/?format=api
{ "id": 2219955, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219955/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-31-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": "<20260405125240.2558577-31-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-31-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:21", "name": "[30/49] mm/sparse-vmemmap: remove unused SPARSEMEM_VMEMMAP_PREINIT feature", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a6e873ad149c23765f17a481edd3083f2222eec6", "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/20260405125240.2558577-31-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/2219955/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219955/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19360-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=NnrrD8zQ;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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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 30/49] mm/sparse-vmemmap: remove unused\n SPARSEMEM_VMEMMAP_PREINIT feature", "Date": "Sun, 5 Apr 2026 20:52:21 +0800", "Message-Id": "<20260405125240.2558577-31-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": "Since the bootmem vmemmap optimization has been reimplemented to use\nthe new early compound vmemmap infrastructure, the old\nSPARSEMEM_VMEMMAP_PREINIT feature and its related code (e.g.,\nsparse_vmemmap_init_nid_early(), preinited_vmemmap_section()) are no\nlonger used.\n\nRemove them to clean up the code.\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n arch/x86/Kconfig | 1 -\n fs/Kconfig | 1 -\n include/linux/mmzone.h | 25 -------------------------\n mm/Kconfig | 5 -----\n mm/sparse-vmemmap.c | 13 -------------\n mm/sparse.c | 23 ++++++++---------------\n 6 files changed, 8 insertions(+), 60 deletions(-)", "diff": "diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig\nindex 99bb5217649a..f19625648f0f 100644\n--- a/arch/x86/Kconfig\n+++ b/arch/x86/Kconfig\n@@ -148,7 +148,6 @@ config X86\n \tselect ARCH_WANT_LD_ORPHAN_WARN\n \tselect ARCH_WANT_OPTIMIZE_DAX_VMEMMAP\tif X86_64\n \tselect ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP\tif X86_64\n-\tselect ARCH_WANT_HUGETLB_VMEMMAP_PREINIT if X86_64\n \tselect ARCH_WANTS_THP_SWAP\t\tif X86_64\n \tselect ARCH_HAS_PARANOID_L1D_FLUSH\n \tselect ARCH_WANT_IRQS_OFF_ACTIVATE_MM\ndiff --git a/fs/Kconfig b/fs/Kconfig\nindex 43cb06de297f..e70aa5f0429a 100644\n--- a/fs/Kconfig\n+++ b/fs/Kconfig\n@@ -278,7 +278,6 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP\n \tdef_bool HUGETLB_PAGE\n \tdepends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP\n \tdepends on SPARSEMEM_VMEMMAP\n-\tselect SPARSEMEM_VMEMMAP_PREINIT if ARCH_WANT_HUGETLB_VMEMMAP_PREINIT\n \n config HUGETLB_PMD_PAGE_TABLE_SHARING\n \tdef_bool HUGETLB_PAGE\ndiff --git a/include/linux/mmzone.h b/include/linux/mmzone.h\nindex 0bd20efac427..75425407e0c4 100644\n--- a/include/linux/mmzone.h\n+++ b/include/linux/mmzone.h\n@@ -2078,9 +2078,6 @@ enum {\n \tSECTION_IS_EARLY_BIT,\n #ifdef CONFIG_ZONE_DEVICE\n \tSECTION_TAINT_ZONE_DEVICE_BIT,\n-#endif\n-#ifdef CONFIG_SPARSEMEM_VMEMMAP_PREINIT\n-\tSECTION_IS_VMEMMAP_PREINIT_BIT,\n #endif\n \tSECTION_MAP_LAST_BIT,\n };\n@@ -2092,9 +2089,6 @@ enum {\n #ifdef CONFIG_ZONE_DEVICE\n #define SECTION_TAINT_ZONE_DEVICE\tBIT(SECTION_TAINT_ZONE_DEVICE_BIT)\n #endif\n-#ifdef CONFIG_SPARSEMEM_VMEMMAP_PREINIT\n-#define SECTION_IS_VMEMMAP_PREINIT\tBIT(SECTION_IS_VMEMMAP_PREINIT_BIT)\n-#endif\n #define SECTION_MAP_MASK\t\t(~(BIT(SECTION_MAP_LAST_BIT) - 1))\n #define SECTION_NID_SHIFT\t\tSECTION_MAP_LAST_BIT\n \n@@ -2149,24 +2143,6 @@ static inline int online_device_section(const struct mem_section *section)\n }\n #endif\n \n-#ifdef CONFIG_SPARSEMEM_VMEMMAP_PREINIT\n-static inline int preinited_vmemmap_section(const struct mem_section *section)\n-{\n-\treturn (section &&\n-\t\t(section->section_mem_map & SECTION_IS_VMEMMAP_PREINIT));\n-}\n-\n-void sparse_vmemmap_init_nid_early(int nid);\n-#else\n-static inline int preinited_vmemmap_section(const struct mem_section *section)\n-{\n-\treturn 0;\n-}\n-static inline void sparse_vmemmap_init_nid_early(int nid)\n-{\n-}\n-#endif\n-\n static inline int online_section_nr(unsigned long nr)\n {\n \treturn online_section(__nr_to_section(nr));\n@@ -2407,7 +2383,6 @@ static inline unsigned long next_present_section_nr(unsigned long section_nr)\n #endif\n \n #else\n-#define sparse_vmemmap_init_nid_early(_nid) do {} while (0)\n #define pfn_in_present_section pfn_valid\n #endif /* CONFIG_SPARSEMEM */\n \ndiff --git a/mm/Kconfig b/mm/Kconfig\nindex e8bf1e9e6ad9..3cce862088f1 100644\n--- a/mm/Kconfig\n+++ b/mm/Kconfig\n@@ -410,8 +410,6 @@ config SPARSEMEM_VMEMMAP\n \t pfn_to_page and page_to_pfn operations. This is the most\n \t efficient option when sufficient kernel resources are available.\n \n-config SPARSEMEM_VMEMMAP_PREINIT\n-\tbool\n #\n # Select this config option from the architecture Kconfig, if it is preferred\n # to enable the feature of HugeTLB/dev_dax vmemmap optimization.\n@@ -422,9 +420,6 @@ config ARCH_WANT_OPTIMIZE_DAX_VMEMMAP\n config ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP\n \tbool\n \n-config ARCH_WANT_HUGETLB_VMEMMAP_PREINIT\n-\tbool\n-\n config HAVE_MEMBLOCK_PHYS_MAP\n \tbool\n \ndiff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c\nindex 9da49b0d03f0..c35d912a1fef 100644\n--- a/mm/sparse-vmemmap.c\n+++ b/mm/sparse-vmemmap.c\n@@ -543,19 +543,6 @@ struct page * __meminit __populate_section_memmap(unsigned long pfn,\n \treturn pfn_to_page(pfn);\n }\n \n-#ifdef CONFIG_SPARSEMEM_VMEMMAP_PREINIT\n-/*\n- * This is called just before initializing sections for a NUMA node.\n- * Any special initialization that needs to be done before the\n- * generic initialization can be done from here. Sections that\n- * are initialized in hooks called from here will be skipped by\n- * the generic initialization.\n- */\n-void __init sparse_vmemmap_init_nid_early(int nid)\n-{\n-}\n-#endif\n-\n static void subsection_mask_set(unsigned long *map, unsigned long pfn,\n \t\tunsigned long nr_pages)\n {\ndiff --git a/mm/sparse.c b/mm/sparse.c\nindex 7779554c5a0c..04c641b97325 100644\n--- a/mm/sparse.c\n+++ b/mm/sparse.c\n@@ -385,27 +385,20 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,\n \t\tpanic(\"The node[%d] usemap allocation failed\\n\", nid);\n \tsparse_buffer_init(map_count * section_map_size(), nid);\n \n-\tsparse_vmemmap_init_nid_early(nid);\n-\n \tfor_each_present_section_nr(pnum_begin, pnum) {\n-\t\tstruct mem_section *ms;\n \t\tunsigned long pfn = section_nr_to_pfn(pnum);\n+\t\tstruct page *map;\n \n \t\tif (pnum >= pnum_end)\n \t\t\tbreak;\n \n-\t\tms = __nr_to_section(pnum);\n-\t\tif (!preinited_vmemmap_section(ms)) {\n-\t\t\tstruct page *map;\n-\n-\t\t\tmap = __populate_section_memmap(pfn, PAGES_PER_SECTION,\n-\t\t\t\t\t\t\tnid, NULL, NULL);\n-\t\t\tif (!map)\n-\t\t\t\tpanic(\"Populate section (%ld) on node[%d] failed\\n\", pnum, nid);\n-\t\t\tmemmap_boot_pages_add(section_vmemmap_pages(pfn, PAGES_PER_SECTION,\n-\t\t\t\t\t\t\t\t NULL, NULL));\n-\t\t\tsparse_init_early_section(nid, map, pnum, 0);\n-\t\t}\n+\t\tmap = __populate_section_memmap(pfn, PAGES_PER_SECTION,\n+\t\t\t\t\t\tnid, NULL, NULL);\n+\t\tif (!map)\n+\t\t\tpanic(\"Populate section (%ld) on node[%d] failed\\n\", pnum, nid);\n+\t\tmemmap_boot_pages_add(section_vmemmap_pages(pfn, PAGES_PER_SECTION,\n+\t\t\t\t\t\t\t NULL, NULL));\n+\t\tsparse_init_early_section(nid, map, pnum, 0);\n \t}\n \tsparse_usage_fini();\n \tsparse_buffer_fini();\n", "prefixes": [ "30/49" ] }