projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 835c134e MG |
1 | /* |
| 2 | * Macros for manipulating and testing flags related to a | |
| d9c23400 | 3 | * pageblock_nr_pages number of pages. |
| 835c134e MG |
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 | /* Macro to aid the definition of ranges of bits */ | |
| 29 | #define PB_range(name, required_bits) \ | |
| 30 | name, name ## _end = (name + required_bits) - 1 | |
| 31 | ||
| 32 | /* Bit indices that affect a whole block of pages */ | |
| 33 | enum pageblock_bits { | |
| a5d76b54 | 34 | PB_range(PB_migrate, 3), /* 3 bits required for migrate types */ |
| 835c134e MG |
35 | NR_PAGEBLOCK_BITS |
| 36 | }; | |
| 37 | ||
| d9c23400 MG |
38 | #ifdef CONFIG_HUGETLB_PAGE |
| 39 | ||
| 40 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE | |
| 41 | ||
| 42 | /* Huge page sizes are variable */ | |
| 43 | extern int pageblock_order; | |
| 44 | ||
| 45 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
| 46 | ||
| 47 | /* Huge pages are a constant size */ | |
| 48 | #define pageblock_order HUGETLB_PAGE_ORDER | |
| 49 | ||
| 50 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
| 51 | ||
| 52 | #else /* CONFIG_HUGETLB_PAGE */ | |
| 53 | ||
| 54 | /* If huge pages are not used, group by MAX_ORDER_NR_PAGES */ | |
| 55 | #define pageblock_order (MAX_ORDER-1) | |
| 56 | ||
| 57 | #endif /* CONFIG_HUGETLB_PAGE */ | |
| 58 | ||
| 59 | #define pageblock_nr_pages (1UL << pageblock_order) | |
| 60 | ||
| 835c134e MG |
61 | /* Forward declaration */ |
| 62 | struct page; | |
| 63 | ||
| 64 | /* Declarations for getting and setting flags. See mm/page_alloc.c */ | |
| 65 | unsigned long get_pageblock_flags_group(struct page *page, | |
| 66 | int start_bitidx, int end_bitidx); | |
| 67 | void set_pageblock_flags_group(struct page *page, unsigned long flags, | |
| 68 | int start_bitidx, int end_bitidx); | |
| 69 | ||
| 70 | #define get_pageblock_flags(page) \ | |
| 71 | get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) | |
| 72 | #define set_pageblock_flags(page) \ | |
| 73 | set_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) | |
| 74 | ||
| 75 | #endif /* PAGEBLOCK_FLAGS_H */ |