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 */
11enum {
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
20void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
21
22void get_page_bootmem(unsigned long info, struct page *page,
23		      unsigned long type);
24void 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 */
31static inline void free_bootmem_page(struct page *page)
32{
33	unsigned long magic = (unsigned long)page->freelist;
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
47static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
48{
49}
50
51static inline void put_page_bootmem(struct page *page)
52{
53}
54
 
 
 
 
 
 
 
 
 
 
55static inline void get_page_bootmem(unsigned long info, struct page *page,
56				    unsigned long type)
57{
58}
59
60static inline void free_bootmem_page(struct page *page)
61{
 
62	free_reserved_page(page);
63}
64#endif
65
66#endif /* __LINUX_BOOTMEM_INFO_H */

 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 */