xref: /linux/include/linux/bootmem_info.h (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
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  */
12 enum {
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
21 void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
22 
23 void get_page_bootmem(unsigned long info, struct page *page,
24 		      unsigned long type);
25 void 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  */
free_bootmem_page(struct page * page)32 static 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
register_page_bootmem_info_node(struct pglist_data * pgdat)48 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
49 {
50 }
51 
put_page_bootmem(struct page * page)52 static inline void put_page_bootmem(struct page *page)
53 {
54 }
55 
get_page_bootmem(unsigned long info,struct page * page,unsigned long type)56 static inline void get_page_bootmem(unsigned long info, struct page *page,
57 				    unsigned long type)
58 {
59 }
60 
free_bootmem_page(struct page * page)61 static 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