[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 */
	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);

#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 */
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 */
835c134e MG	33	NR_PAGEBLOCK_BITS
	34	};
	35
d9c23400 MG	36	#ifdef CONFIG_HUGETLB_PAGE
	37
	38	#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
	39
	40	/* Huge page sizes are variable */
	41	extern int pageblock_order;
	42
	43	#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
	44
	45	/* Huge pages are a constant size */
	46	#define pageblock_order HUGETLB_PAGE_ORDER
	47
	48	#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
	49
	50	#else /* CONFIG_HUGETLB_PAGE */
	51
	52	/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
	53	#define pageblock_order (MAX_ORDER-1)
	54
	55	#endif /* CONFIG_HUGETLB_PAGE */
	56
	57	#define pageblock_nr_pages (1UL << pageblock_order)
	58
835c134e MG	59	/* Forward declaration */
	60	struct page;
	61
	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);
	67
	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)
	72
	73	#endif /* PAGEBLOCK_FLAGS_H */