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 page->lru.next. These have to be in
10 * some random range in unsigned long space for debugging purposes.
11 */
12enum {
13 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
14 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
15 MIX_SECTION_INFO,
16 NODE_INFO,
17 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
18};
19
20#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
21void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
22
23void get_page_bootmem(unsigned long info, struct page *page,
24 unsigned long type);
25void put_page_bootmem(struct page *page);
26
27/*
28 * Any memory allocated via the memblock allocator and not via the
29 * buddy will be marked reserved already in the memmap. For those
30 * pages, we can call this function to free it to buddy allocator.
31 */
32static inline void free_bootmem_page(struct page *page)
33{
34 unsigned long magic = page->index;
35
36 /*
37 * The reserve_bootmem_region sets the reserved flag on bootmem
38 * pages.
39 */
40 VM_BUG_ON_PAGE(page_ref_count(page) != 2, page);
41
42 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO)
43 put_page_bootmem(page);
44 else
45 VM_BUG_ON_PAGE(1, page);
46}
47#else
48static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
49{
50}
51
52static inline void put_page_bootmem(struct page *page)
53{
54}
55
56static inline void get_page_bootmem(unsigned long info, struct page *page,
57 unsigned long type)
58{
59}
60
61static inline void free_bootmem_page(struct page *page)
62{
63 kmemleak_free_part_phys(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE);
64 free_reserved_page(page);
65}
66#endif
67
68#endif /* __LINUX_BOOTMEM_INFO_H */
69

source code of linux/include/linux/bootmem_info.h