1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_BOOTMEM_INFO_H 3 #define __LINUX_BOOTMEM_INFO_H 4 5 #include <linux/mm.h> 6 #include <linux/kmemleak.h> 7 8 /* 9 * Types for free bootmem stored in the low bits of page->private. 10 */ 11 enum bootmem_type { 12 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 1, 13 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 14 MIX_SECTION_INFO, 15 NODE_INFO, 16 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 17 }; 18 19 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 20 void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 21 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, 22 unsigned long nr_pages); 23 24 void get_page_bootmem(unsigned long info, struct page *page, 25 enum bootmem_type type); 26 void put_page_bootmem(struct page *page); 27 28 static inline enum bootmem_type bootmem_type(const struct page *page) 29 { 30 return (unsigned long)page->private & 0xf; 31 } 32 33 static inline unsigned long bootmem_info(const struct page *page) 34 { 35 return (unsigned long)page->private >> 4; 36 } 37 38 /* 39 * Any memory allocated via the memblock allocator and not via the 40 * buddy will be marked reserved already in the memmap. For those 41 * pages, we can call this function to free it to buddy allocator. 42 */ 43 static inline void free_bootmem_page(struct page *page) 44 { 45 enum bootmem_type type = bootmem_type(page); 46 47 /* 48 * The reserve_bootmem_region sets the reserved flag on bootmem 49 * pages. 50 */ 51 VM_BUG_ON_PAGE(page_ref_count(page) != 2, page); 52 53 if (type == SECTION_INFO || type == MIX_SECTION_INFO) 54 put_page_bootmem(page); 55 else 56 VM_BUG_ON_PAGE(1, page); 57 } 58 #else 59 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 60 { 61 } 62 63 static inline void register_page_bootmem_memmap(unsigned long section_nr, 64 struct page *map, unsigned long nr_pages) 65 { 66 } 67 68 static inline void put_page_bootmem(struct page *page) 69 { 70 } 71 72 static inline enum bootmem_type bootmem_type(const struct page *page) 73 { 74 return SECTION_INFO; 75 } 76 77 static inline unsigned long bootmem_info(const struct page *page) 78 { 79 return 0; 80 } 81 82 static inline void get_page_bootmem(unsigned long info, struct page *page, 83 enum bootmem_type type) 84 { 85 } 86 87 static inline void free_bootmem_page(struct page *page) 88 { 89 kmemleak_free_part_phys(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE); 90 free_reserved_page(page); 91 } 92 #endif 93 94 #endif /* __LINUX_BOOTMEM_INFO_H */ 95