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
22 void get_page_bootmem(unsigned long info, struct page *page,
23 enum bootmem_type type);
24 void put_page_bootmem(struct page *page);
25
bootmem_type(const struct page * page)26 static inline enum bootmem_type bootmem_type(const struct page *page)
27 {
28 return (unsigned long)page->private & 0xf;
29 }
30
bootmem_info(const struct page * page)31 static inline unsigned long bootmem_info(const struct page *page)
32 {
33 return (unsigned long)page->private >> 4;
34 }
35
36 /*
37 * Any memory allocated via the memblock allocator and not via the
38 * buddy will be marked reserved already in the memmap. For those
39 * pages, we can call this function to free it to buddy allocator.
40 */
free_bootmem_page(struct page * page)41 static inline void free_bootmem_page(struct page *page)
42 {
43 enum bootmem_type type = bootmem_type(page);
44
45 /*
46 * The reserve_bootmem_region sets the reserved flag on bootmem
47 * pages.
48 */
49 VM_BUG_ON_PAGE(page_ref_count(page) != 2, page);
50
51 if (type == SECTION_INFO || type == MIX_SECTION_INFO)
52 put_page_bootmem(page);
53 else
54 VM_BUG_ON_PAGE(1, page);
55 }
56 #else
register_page_bootmem_info_node(struct pglist_data * pgdat)57 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
58 {
59 }
60
put_page_bootmem(struct page * page)61 static inline void put_page_bootmem(struct page *page)
62 {
63 }
64
bootmem_type(const struct page * page)65 static inline enum bootmem_type bootmem_type(const struct page *page)
66 {
67 return SECTION_INFO;
68 }
69
bootmem_info(const struct page * page)70 static inline unsigned long bootmem_info(const struct page *page)
71 {
72 return 0;
73 }
74
get_page_bootmem(unsigned long info,struct page * page,enum bootmem_type type)75 static inline void get_page_bootmem(unsigned long info, struct page *page,
76 enum bootmem_type type)
77 {
78 }
79
free_bootmem_page(struct page * page)80 static inline void free_bootmem_page(struct page *page)
81 {
82 kmemleak_free_part_phys(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE);
83 free_reserved_page(page);
84 }
85 #endif
86
87 #endif /* __LINUX_BOOTMEM_INFO_H */
88