| /* |
| * Macros for manipulating and testing flags related to a |
| * MAX_ORDER_NR_PAGES block of pages. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation version 2 of the License |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| * Copyright (C) IBM Corporation, 2006 |
| * |
| * Original author, Mel Gorman |
| * Major cleanups and reduction of bit operations, Andy Whitcroft |
| */ |
| #ifndef PAGEBLOCK_FLAGS_H |
| #define PAGEBLOCK_FLAGS_H |
| |
| #include <linux/types.h> |
| |
| /* Macro to aid the definition of ranges of bits */ |
| #define PB_range(name, required_bits) \ |
| name, name ## _end = (name + required_bits) - 1 |
| |
| /* Bit indices that affect a whole block of pages */ |
| enum pageblock_bits { |
| PB_range(PB_migrate, 3), /* 3 bits required for migrate types */ |
| NR_PAGEBLOCK_BITS |
| }; |
| |
| /* Forward declaration */ |
| struct page; |
| |
| /* Declarations for getting and setting flags. See mm/page_alloc.c */ |
| unsigned long get_pageblock_flags_group(struct page *page, |
| int start_bitidx, int end_bitidx); |
| void set_pageblock_flags_group(struct page *page, unsigned long flags, |
| int start_bitidx, int end_bitidx); |
| |
| #define get_pageblock_flags(page) \ |
| get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) |
| #define set_pageblock_flags(page) \ |
| set_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) |
| |
| #endif /* PAGEBLOCK_FLAGS_H */ |