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 */
free_bootmem_page(struct page * page)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
register_page_bootmem_info_node(struct pglist_data * pgdat)47 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
48 {
49 }
50
put_page_bootmem(struct page * page)51 static inline void put_page_bootmem(struct page *page)
52 {
53 }
54
get_page_bootmem(unsigned long info,struct page * page,unsigned long type)55 static inline void get_page_bootmem(unsigned long info, struct page *page,
56 unsigned long type)
57 {
58 }
59
free_bootmem_page(struct page * page)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