| Quellcodebibliothek Statistik Leitseite products/sources/formale Sprachen/C/Linux/mm/ (Open Source Betriebssystem Version 6.17.9©) Datei vom 24.10.2025 mit Größe 3 kB |
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Quelle bootmem_info.c Sprache: C |
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// SPDX-License-Identifier: GPL-2.0
/* * Bootmem core functions. * * Copyright (c) 2020, Bytedance. * * Author: Muchun Song <songmuchun@bytedance.com> * */ #include <linux/mm.h> #include <linux/compiler.h> #include <linux/memblock.h> #include <linux/bootmem_info.h> #include <linux/memory_hotplug.h> #include <linux/kmemleak.h> void get_page_bootmem(unsigned long info, struct page *page, enum bootmem_type type) { BUG_ON(type > 0xf); BUG_ON(info > (ULONG_MAX >> 4)); SetPagePrivate(page); set_page_private(page, info << 4 | type); page_ref_inc(page); } void put_page_bootmem(struct page *page) { enum bootmem_type type = bootmem_type(page); BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); if (page_ref_dec_return(page) == 1) { ClearPagePrivate(page); set_page_private(page, 0); INIT_LIST_HEAD(&page->lru); kmemleak_free_part_phys(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE); free_reserved_page(page); } } #ifndef CONFIG_SPARSEMEM_VMEMMAP static void __init register_page_bootmem_info_section(unsigned long start_pfn) { unsigned long mapsize, section_nr, i; struct mem_section *ms; struct page *page, *memmap; struct mem_section_usage *usage; section_nr = pfn_to_section_nr(start_pfn); ms = __nr_to_section(section_nr); /* Get section's memmap address */ memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); /* * Get page for the memmap's phys address * XXX: need more consideration for sparse_vmemmap... */ page = virt_to_page(memmap); mapsize = sizeof(struct page) * PAGES_PER_SECTION; mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; /* remember memmap's page */ for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, SECTION_INFO); usage = ms->usage; page = virt_to_page(usage); mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, MIX_SECTION_INFO); } #else /* CONFIG_SPARSEMEM_VMEMMAP */ static void __init register_page_bootmem_info_section(unsigned long start_pfn) { unsigned long mapsize, section_nr, i; struct mem_section *ms; struct page *page, *memmap; struct mem_section_usage *usage; section_nr = pfn_to_section_nr(start_pfn); ms = __nr_to_section(section_nr); memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); if (!preinited_vmemmap_section(ms)) register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); usage = ms->usage; page = virt_to_page(usage); mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, MIX_SECTION_INFO); } #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ void __init register_page_bootmem_info_node(struct pglist_data *pgdat) { unsigned long i, pfn, end_pfn, nr_pages; int node = pgdat->node_id; struct page *page; nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; page = virt_to_page(pgdat); for (i = 0; i < nr_pages; i++, page++) get_page_bootmem(node, page, NODE_INFO); pfn = pgdat->node_start_pfn; end_pfn = pgdat_end_pfn(pgdat); /* register section info */ for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { /* * Some platforms can assign the same pfn to multiple nodes - on * node0 as well as nodeN. To avoid registering a pfn against * multiple nodes we check that this pfn does not already * reside in some other nodes. */ if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) register_page_bootmem_info_section(pfn); } } ¤ Dauer der Verarbeitung: 0.3 Sekunden ¤*© Formatika GbR, Deutschland |
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2026-03-28