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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 */
11enum 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
20void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
21
22void get_page_bootmem(unsigned long info, struct page *page,
23 enum bootmem_type type);
24void put_page_bootmem(struct page *page);
25
26static inline enum bootmem_type bootmem_type(const struct page *page)
27{
28 return (unsigned long)page->private & 0xf;
29}
30
31static 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 */
41static 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
57static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
58{
59}
60
61static inline void put_page_bootmem(struct page *page)
62{
63}
64
65static inline enum bootmem_type bootmem_type(const struct page *page)
66{
67 return SECTION_INFO;
68}
69
70static inline unsigned long bootmem_info(const struct page *page)
71{
72 return 0;
73}
74
75static inline void get_page_bootmem(unsigned long info, struct page *page,
76 enum bootmem_type type)
77{
78}
79
80static 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 */