2 * Macros for manipulating and testing flags related to a
3 * MAX_ORDER_NR_PAGES block of pages.
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
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.
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.
18 * Copyright (C) IBM Corporation, 2006
20 * Original author, Mel Gorman
21 * Major cleanups and reduction of bit operations, Andy Whitcroft
23 #ifndef PAGEBLOCK_FLAGS_H
24 #define PAGEBLOCK_FLAGS_H
26 #include <linux/types.h>
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
32 /* Bit indices that affect a whole block of pages */
37 /* Forward declaration */
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);
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)
51 #endif /* PAGEBLOCK_FLAGS_H */