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873e65bc | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
835c134e MG |
2 | /* |
3 | * Macros for manipulating and testing flags related to a | |
d9c23400 | 4 | * pageblock_nr_pages number of pages. |
835c134e | 5 | * |
835c134e MG |
6 | * Copyright (C) IBM Corporation, 2006 |
7 | * | |
8 | * Original author, Mel Gorman | |
9 | * Major cleanups and reduction of bit operations, Andy Whitcroft | |
10 | */ | |
11 | #ifndef PAGEBLOCK_FLAGS_H | |
12 | #define PAGEBLOCK_FLAGS_H | |
13 | ||
14 | #include <linux/types.h> | |
15 | ||
125b860b | 16 | #define PB_migratetype_bits 3 |
835c134e MG |
17 | /* Bit indices that affect a whole block of pages */ |
18 | enum pageblock_bits { | |
c801ed38 | 19 | PB_migrate, |
125b860b | 20 | PB_migrate_end = PB_migrate + PB_migratetype_bits - 1, |
c801ed38 | 21 | /* 3 bits required for migrate types */ |
bb13ffeb | 22 | PB_migrate_skip,/* If set the block is skipped by compaction */ |
e58469ba MG |
23 | |
24 | /* | |
25 | * Assume the bits will always align on a word. If this assumption | |
26 | * changes then get/set pageblock needs updating. | |
27 | */ | |
835c134e MG |
28 | NR_PAGEBLOCK_BITS |
29 | }; | |
30 | ||
d9c23400 MG |
31 | #ifdef CONFIG_HUGETLB_PAGE |
32 | ||
33 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE | |
34 | ||
35 | /* Huge page sizes are variable */ | |
d00181b9 | 36 | extern unsigned int pageblock_order; |
d9c23400 MG |
37 | |
38 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
39 | ||
40 | /* Huge pages are a constant size */ | |
41 | #define pageblock_order HUGETLB_PAGE_ORDER | |
42 | ||
43 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
44 | ||
45 | #else /* CONFIG_HUGETLB_PAGE */ | |
46 | ||
47 | /* If huge pages are not used, group by MAX_ORDER_NR_PAGES */ | |
48 | #define pageblock_order (MAX_ORDER-1) | |
49 | ||
50 | #endif /* CONFIG_HUGETLB_PAGE */ | |
51 | ||
52 | #define pageblock_nr_pages (1UL << pageblock_order) | |
53 | ||
835c134e MG |
54 | /* Forward declaration */ |
55 | struct page; | |
56 | ||
dc4b0caf MG |
57 | unsigned long get_pfnblock_flags_mask(struct page *page, |
58 | unsigned long pfn, | |
e58469ba | 59 | unsigned long mask); |
dc4b0caf MG |
60 | |
61 | void set_pfnblock_flags_mask(struct page *page, | |
e58469ba | 62 | unsigned long flags, |
dc4b0caf | 63 | unsigned long pfn, |
e58469ba MG |
64 | unsigned long mask); |
65 | ||
835c134e | 66 | /* Declarations for getting and setting flags. See mm/page_alloc.c */ |
bb13ffeb MG |
67 | #ifdef CONFIG_COMPACTION |
68 | #define get_pageblock_skip(page) \ | |
d93d5ab9 | 69 | get_pfnblock_flags_mask(page, page_to_pfn(page), \ |
535b81e2 | 70 | (1 << (PB_migrate_skip))) |
bb13ffeb | 71 | #define clear_pageblock_skip(page) \ |
d93d5ab9 | 72 | set_pfnblock_flags_mask(page, 0, page_to_pfn(page), \ |
535b81e2 | 73 | (1 << PB_migrate_skip)) |
bb13ffeb | 74 | #define set_pageblock_skip(page) \ |
d93d5ab9 WY |
75 | set_pfnblock_flags_mask(page, (1 << PB_migrate_skip), \ |
76 | page_to_pfn(page), \ | |
535b81e2 | 77 | (1 << PB_migrate_skip)) |
21dc7e02 DR |
78 | #else |
79 | static inline bool get_pageblock_skip(struct page *page) | |
80 | { | |
81 | return false; | |
82 | } | |
83 | static inline void clear_pageblock_skip(struct page *page) | |
84 | { | |
85 | } | |
86 | static inline void set_pageblock_skip(struct page *page) | |
87 | { | |
88 | } | |
bb13ffeb MG |
89 | #endif /* CONFIG_COMPACTION */ |
90 | ||
835c134e | 91 | #endif /* PAGEBLOCK_FLAGS_H */ |