Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Macros for manipulating and testing flags related to a |
| 3 | * MAX_ORDER_NR_PAGES block 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 | /* 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 { |
| 34 | NR_PAGEBLOCK_BITS |
| 35 | }; |
| 36 | |
| 37 | /* Forward declaration */ |
| 38 | struct page; |
| 39 | |
| 40 | /* Declarations for getting and setting flags. See mm/page_alloc.c */ |
| 41 | unsigned long get_pageblock_flags_group(struct page *page, |
| 42 | int start_bitidx, int end_bitidx); |
| 43 | void set_pageblock_flags_group(struct page *page, unsigned long flags, |
| 44 | int start_bitidx, int end_bitidx); |
| 45 | |
| 46 | #define get_pageblock_flags(page) \ |
| 47 | get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) |
| 48 | #define set_pageblock_flags(page) \ |
| 49 | set_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) |
| 50 | |
| 51 | #endif /* PAGEBLOCK_FLAGS_H */ |