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 7 /* 8 * Types for free bootmem stored in page->lru.next. These have to be in 9 * some random range in unsigned long space for debugging purposes. 10 */ 11 enum { 12 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 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 22 void get_page_bootmem(unsigned long info, struct page *page, 23 unsigned long type); 24 void put_page_bootmem(struct page *page); 25 26 /* 27 * Any memory allocated via the memblock allocator and not via the 28 * buddy will be marked reserved already in the memmap. For those 29 * pages, we can call this function to free it to buddy allocator. 30 */ 31 static inline void free_bootmem_page(struct page *page) 32 { 33 unsigned long magic = page->index; 34 35 /* 36 * The reserve_bootmem_region sets the reserved flag on bootmem 37 * pages. 38 */ 39 VM_BUG_ON_PAGE(page_ref_count(page) != 2, page); 40 41 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) 42 put_page_bootmem(page); 43 else 44 VM_BUG_ON_PAGE(1, page); 45 } 46 #else 47 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 48 { 49 } 50 51 static inline void put_page_bootmem(struct page *page) 52 { 53 } 54 55 static inline void get_page_bootmem(unsigned long info, struct page *page, 56 unsigned long type) 57 { 58 } 59 60 static inline void free_bootmem_page(struct page *page) 61 { 62 free_reserved_page(page); 63 } 64 #endif 65 66 #endif /* __LINUX_BOOTMEM_INFO_H */ 67