[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / pageblock-flags.h

/*
 * Macros for manipulating and testing flags related to a
 * pageblock_nr_pages number 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>

/* Bit indices that affect a whole block of pages */
enum pageblock_bits {
	PB_migrate,
	PB_migrate_end = PB_migrate + 3 - 1,
			/* 3 bits required for migrate types */
#ifdef CONFIG_COMPACTION
	PB_migrate_skip,/* If set the block is skipped by compaction */
#endif /* CONFIG_COMPACTION */
	NR_PAGEBLOCK_BITS
};

#ifdef CONFIG_HUGETLB_PAGE

#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE

/* Huge page sizes are variable */
extern int pageblock_order;

#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */

/* Huge pages are a constant size */
#define pageblock_order		HUGETLB_PAGE_ORDER

#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */

#else /* CONFIG_HUGETLB_PAGE */

/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
#define pageblock_order		(MAX_ORDER-1)

#endif /* CONFIG_HUGETLB_PAGE */

#define pageblock_nr_pages	(1UL << pageblock_order)

/* 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);

#ifdef CONFIG_COMPACTION
#define get_pageblock_skip(page) \
			get_pageblock_flags_group(page, PB_migrate_skip,     \
							PB_migrate_skip)
#define clear_pageblock_skip(page) \
			set_pageblock_flags_group(page, 0, PB_migrate_skip,  \
							PB_migrate_skip)
#define set_pageblock_skip(page) \
			set_pageblock_flags_group(page, 1, PB_migrate_skip,  \
							PB_migrate_skip)
#endif /* CONFIG_COMPACTION */

#define get_pageblock_flags(page) \
			get_pageblock_flags_group(page, 0, PB_migrate_end)
#define set_pageblock_flags(page, flags) \
			set_pageblock_flags_group(page, flags,	\
						  0, PB_migrate_end)

#endif	/* PAGEBLOCK_FLAGS_H */
Commit	Line	Data
835c134e MG	1	/*
835c134e MG	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
835c134e MG	28	/* Bit indices that affect a whole block of pages */
835c134e MG	29	enum pageblock_bits {
c801ed38 PJ	30	PB_migrate,
	31	PB_migrate_end = PB_migrate + 3 - 1,
	32	/* 3 bits required for migrate types */
bb13ffeb MG	33	#ifdef CONFIG_COMPACTION
	34	PB_migrate_skip,/* If set the block is skipped by compaction */
	35	#endif /* CONFIG_COMPACTION */
835c134e MG	36	NR_PAGEBLOCK_BITS
	37	};
	38
d9c23400 MG	39	#ifdef CONFIG_HUGETLB_PAGE
	40
	41	#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
	42
	43	/* Huge page sizes are variable */
	44	extern int pageblock_order;
	45
	46	#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
	47
	48	/* Huge pages are a constant size */
	49	#define pageblock_order HUGETLB_PAGE_ORDER
	50
	51	#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
	52
	53	#else /* CONFIG_HUGETLB_PAGE */
	54
	55	/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
	56	#define pageblock_order (MAX_ORDER-1)
	57
	58	#endif /* CONFIG_HUGETLB_PAGE */
	59
	60	#define pageblock_nr_pages (1UL << pageblock_order)
	61
835c134e MG	62	/* Forward declaration */
	63	struct page;
	64
	65	/* Declarations for getting and setting flags. See mm/page_alloc.c */
	66	unsigned long get_pageblock_flags_group(struct page *page,
	67	int start_bitidx, int end_bitidx);
	68	void set_pageblock_flags_group(struct page *page, unsigned long flags,
	69	int start_bitidx, int end_bitidx);
	70
bb13ffeb MG	71	#ifdef CONFIG_COMPACTION
	72	#define get_pageblock_skip(page) \
	73	get_pageblock_flags_group(page, PB_migrate_skip, \
62726059	74	PB_migrate_skip)
bb13ffeb MG	75	#define clear_pageblock_skip(page) \
bb13ffeb MG	76	set_pageblock_flags_group(page, 0, PB_migrate_skip, \
62726059	77	PB_migrate_skip)
bb13ffeb MG	78	#define set_pageblock_skip(page) \
bb13ffeb MG	79	set_pageblock_flags_group(page, 1, PB_migrate_skip, \
62726059	80	PB_migrate_skip)
bb13ffeb MG	81	#endif /* CONFIG_COMPACTION */
bb13ffeb MG	82
835c134e	83	#define get_pageblock_flags(page) \
bb13ffeb	84	get_pageblock_flags_group(page, 0, PB_migrate_end)
f19e77a3	85	#define set_pageblock_flags(page, flags) \
f19e77a3	86	set_pageblock_flags_group(page, flags, \
bb13ffeb	87	0, PB_migrate_end)
835c134e MG	88
835c134e MG	89	#endif /* PAGEBLOCK_FLAGS_H */