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1 | /* |
2 | * Macros for manipulating and testing flags related to a |
3 | * pageblock_nr_pages number of pages. |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation version 2 of the License |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
17 | * |
18 | * Copyright (C) IBM Corporation, 2006 |
19 | * |
20 | * Original author, Mel Gorman |
21 | * Major cleanups and reduction of bit operations, Andy Whitcroft |
22 | */ |
23 | #ifndef PAGEBLOCK_FLAGS_H |
24 | #define PAGEBLOCK_FLAGS_H |
25 | |
26 | #include <linux/types.h> |
27 | |
28 | /* Bit indices that affect a whole block of pages */ |
29 | enum pageblock_bits { |
30 | PB_migrate, |
31 | PB_migrate_end = PB_migrate + 3 - 1, |
32 | /* 3 bits required for migrate types */ |
33 | NR_PAGEBLOCK_BITS |
34 | }; |
35 | |
36 | #ifdef CONFIG_HUGETLB_PAGE |
37 | |
38 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
39 | |
40 | /* Huge page sizes are variable */ |
41 | extern int pageblock_order; |
42 | |
43 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ |
44 | |
45 | /* Huge pages are a constant size */ |
46 | #define pageblock_order HUGETLB_PAGE_ORDER |
47 | |
48 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ |
49 | |
50 | #else /* CONFIG_HUGETLB_PAGE */ |
51 | |
52 | /* If huge pages are not used, group by MAX_ORDER_NR_PAGES */ |
53 | #define pageblock_order (MAX_ORDER-1) |
54 | |
55 | #endif /* CONFIG_HUGETLB_PAGE */ |
56 | |
57 | #define pageblock_nr_pages (1UL << pageblock_order) |
58 | |
59 | /* Forward declaration */ |
60 | struct page; |
61 | |
62 | /* Declarations for getting and setting flags. See mm/page_alloc.c */ |
63 | unsigned long get_pageblock_flags_group(struct page *page, |
64 | int start_bitidx, int end_bitidx); |
65 | void set_pageblock_flags_group(struct page *page, unsigned long flags, |
66 | int start_bitidx, int end_bitidx); |
67 | |
68 | #define get_pageblock_flags(page) \ |
69 | get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) |
70 | #define set_pageblock_flags(page) \ |
71 | set_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) |
72 | |
73 | #endif /* PAGEBLOCK_FLAGS_H */ |
74 |
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