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11#ifndef PAGEBLOCK_FLAGS_H
12#define PAGEBLOCK_FLAGS_H
13
14#include <linux/types.h>
15
16#define PB_migratetype_bits 3
17
18enum pageblock_bits {
19 PB_migrate,
20 PB_migrate_end = PB_migrate + PB_migratetype_bits - 1,
21
22 PB_migrate_skip,
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26
27
28 NR_PAGEBLOCK_BITS
29};
30
31#ifdef CONFIG_HUGETLB_PAGE
32
33#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
34
35
36extern unsigned int pageblock_order;
37
38#else
39
40
41#define pageblock_order HUGETLB_PAGE_ORDER
42
43#endif
44
45#else
46
47
48#define pageblock_order (MAX_ORDER-1)
49
50#endif
51
52#define pageblock_nr_pages (1UL << pageblock_order)
53
54
55struct page;
56
57unsigned long get_pfnblock_flags_mask(const struct page *page,
58 unsigned long pfn,
59 unsigned long mask);
60
61void set_pfnblock_flags_mask(struct page *page,
62 unsigned long flags,
63 unsigned long pfn,
64 unsigned long mask);
65
66
67#ifdef CONFIG_COMPACTION
68#define get_pageblock_skip(page) \
69 get_pfnblock_flags_mask(page, page_to_pfn(page), \
70 (1 << (PB_migrate_skip)))
71#define clear_pageblock_skip(page) \
72 set_pfnblock_flags_mask(page, 0, page_to_pfn(page), \
73 (1 << PB_migrate_skip))
74#define set_pageblock_skip(page) \
75 set_pfnblock_flags_mask(page, (1 << PB_migrate_skip), \
76 page_to_pfn(page), \
77 (1 << PB_migrate_skip))
78#else
79static inline bool get_pageblock_skip(struct page *page)
80{
81 return false;
82}
83static inline void clear_pageblock_skip(struct page *page)
84{
85}
86static inline void set_pageblock_skip(struct page *page)
87{
88}
89#endif
90
91#endif
92