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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/pageblock-flags.h
2 * Macros for manipulating and testing flags related to a
3 * pageblock_nr_pages number 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 /* Bit indices that affect a whole block of pages */
31 PB_migrate_end
= PB_migrate
+ 3 - 1,
32 /* 3 bits required for migrate types */
36 #ifdef CONFIG_HUGETLB_PAGE
38 #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
40 /* Huge page sizes are variable */
41 extern int pageblock_order
;
43 #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
45 /* Huge pages are a constant size */
46 #define pageblock_order HUGETLB_PAGE_ORDER
48 #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
50 #else /* CONFIG_HUGETLB_PAGE */
52 /* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
53 #define pageblock_order (MAX_ORDER-1)
55 #endif /* CONFIG_HUGETLB_PAGE */
57 #define pageblock_nr_pages (1UL << pageblock_order)
59 /* Forward declaration */
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
);
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)
73 #endif /* PAGEBLOCK_FLAGS_H */