[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>

struct ctl_table;
struct user_struct;
struct mmu_gather;

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
#include <linux/shm.h>
#include <asm/tlbflush.h>

struct hugepage_subpool {
	spinlock_t lock;
	long count;
	long max_hpages, used_hpages;
};

extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \
	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)

struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);

int PageHuge(struct page *page);
int PageHeadHuge(struct page *page_head);

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);

#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
					void __user *, size_t *, loff_t *);
#endif

int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
			 unsigned long *, unsigned long *, long, unsigned int);
void unmap_hugepage_range(struct vm_area_struct *,
			  unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(int, char *);
void hugetlb_show_meminfo(void);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, unsigned int flags);
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						vm_flags_t vm_flags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
int dequeue_hwpoisoned_huge_page(struct page *page);
void copy_huge_page(struct page *dst, struct page *src);

extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;

/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
			      int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
				pmd_t *pmd, int write);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pmd);
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);

#else /* !CONFIG_HUGETLB_PAGE */

static inline int PageHuge(struct page *page)
{
	return 0;
}

static inline int PageHeadHuge(struct page *page_head)
{
	return 0;
}

static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
#define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf)	0
static inline void hugetlb_show_meminfo(void)
{
}
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
#define follow_huge_pud(mm, addr, pud, write)	NULL
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
#define pmd_huge(x)	0
#define pud_huge(x)	0
#define is_hugepage_only_range(mm, addr, len)	0
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
#define huge_pte_offset(mm, address)	0
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

static inline void copy_huge_page(struct page *dst, struct page *src)
{
}

static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}

static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

#endif /* !CONFIG_HUGETLB_PAGE */

#define HUGETLB_ANON_FILE "anon_hugepage"

enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
};

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
	struct hstate *hstate;
	struct hugepage_subpool *spool;
};

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
				struct user_struct **user, int creat_flags,
				int page_size_log);

static inline int is_file_hugepages(struct file *file)
{
	if (file->f_op == &hugetlbfs_file_operations)
		return 1;
	if (is_file_shm_hugepages(file))
		return 1;

	return 0;
}


#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			0
static inline struct file *
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
		int page_size_log)
{
	return ERR_PTR(-ENOSYS);
}

#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
					unsigned long len, unsigned long pgoff,
					unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

#ifdef CONFIG_HUGETLB_PAGE

#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
	int next_nid_to_alloc;
	int next_nid_to_free;
	unsigned int order;
	unsigned long mask;
	unsigned long max_huge_pages;
	unsigned long nr_huge_pages;
	unsigned long free_huge_pages;
	unsigned long resv_huge_pages;
	unsigned long surplus_huge_pages;
	unsigned long nr_overcommit_huge_pages;
	struct list_head hugepage_activelist;
	struct list_head hugepage_freelists[MAX_NUMNODES];
	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	unsigned int free_huge_pages_node[MAX_NUMNODES];
	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
	char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
};

struct page *alloc_huge_page_node(struct hstate *h, int nid);

/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

void __init hugetlb_add_hstate(unsigned order);
struct hstate *size_to_hstate(unsigned long size);

#ifndef HUGE_MAX_HSTATE
#define HUGE_MAX_HSTATE 1
#endif

extern struct hstate hstates[HUGE_MAX_HSTATE];
extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

static inline struct hstate *hstate_inode(struct inode *i)
{
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return hstate_inode(file_inode(f));
}

static inline struct hstate *hstate_sizelog(int page_size_log)
{
	if (!page_size_log)
		return &default_hstate;
	return size_to_hstate(1 << page_size_log);
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
	return hstate_file(vma->vm_file);
}

static inline unsigned long huge_page_size(struct hstate *h)
{
	return (unsigned long)PAGE_SIZE << h->order;
}

extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

static inline unsigned long huge_page_mask(struct hstate *h)
{
	return h->mask;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
	return h->order;
}

static inline unsigned huge_page_shift(struct hstate *h)
{
	return h->order + PAGE_SHIFT;
}

static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1 << h->order;
}

static inline unsigned int blocks_per_huge_page(struct hstate *h)
{
	return huge_page_size(h) / 512;
}

#include <asm/hugetlb.h>

#ifndef arch_make_huge_pte
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
				       struct page *page, int writable)
{
	return entry;
}
#endif

static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

pgoff_t __basepage_index(struct page *page);

/* Return page->index in PAGE_SIZE units */
static inline pgoff_t basepage_index(struct page *page)
{
	if (!PageCompound(page))
		return page->index;

	return __basepage_index(page);
}

#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) NULL
#define hstate_sizelog(s) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
#define vma_kernel_pagesize(v) PAGE_SIZE
#define vma_mmu_pagesize(v) PAGE_SIZE
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
#define hstate_index_to_shift(index) 0
#define hstate_index(h) 0

static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
#endif	/* CONFIG_HUGETLB_PAGE */

#endif /* _LINUX_HUGETLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
be93d8cf	4	#include <linux/mm_types.h>
4e950f6f	5	#include <linux/fs.h>
8edf344c	6	#include <linux/hugetlb_inline.h>
abb8206c	7	#include <linux/cgroup.h>
4e950f6f	8
e9ea0e2d AM	9	struct ctl_table;
e9ea0e2d AM	10	struct user_struct;
24669e58	11	struct mmu_gather;
e9ea0e2d	12
1da177e4 LT	13	#ifdef CONFIG_HUGETLB_PAGE
	14
	15	#include <linux/mempolicy.h>
516dffdc	16	#include <linux/shm.h>
63551ae0	17	#include <asm/tlbflush.h>
1da177e4	18
90481622 DG	19	struct hugepage_subpool {
	20	spinlock_t lock;
	21	long count;
	22	long max_hpages, used_hpages;
	23	};
	24
c3f38a38 AK	25	extern spinlock_t hugetlb_lock;
	26	extern int hugetlb_max_hstate __read_mostly;
	27	#define for_each_hstate(h) \
	28	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	29
90481622 DG	30	struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
	31	void hugepage_put_subpool(struct hugepage_subpool *spool);
	32
20a0307c	33	int PageHuge(struct page *page);
17b6ada0	34	int PageHeadHuge(struct page *page_head);
20a0307c	35
a1e78772	36	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	37	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	38	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	39	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	40
	41	#ifdef CONFIG_NUMA
	42	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	43	void __user , size_t , loff_t *);
	44	#endif
	45
1da177e4	46	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	47	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	48	struct page , struct vm_area_struct ,
	49	unsigned long , unsigned long , long, unsigned int);
04f2cbe3	50	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	51	unsigned long, unsigned long, struct page *);
d833352a MG	52	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	53	struct vm_area_struct *vma,
	54	unsigned long start, unsigned long end,
	55	struct page *ref_page);
24669e58 AK	56	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	57	unsigned long start, unsigned long end,
	58	struct page *ref_page);
1da177e4	59	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	60	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	61	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	62	void hugetlb_show_meminfo(void);
1da177e4	63	unsigned long hugetlb_total_pages(void);
ac9b9c66	64	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	65	unsigned long address, unsigned int flags);
a1e78772	66	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	67	struct vm_area_struct *vma,
ca16d140	68	vm_flags_t vm_flags);
a43a8c39	69	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	70	int dequeue_hwpoisoned_huge_page(struct page *page);
0ebabb41	71	void copy_huge_page(struct page dst, struct page src);
1da177e4	72
396faf03	73	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	74	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	75	extern int sysctl_hugetlb_shm_group;
53ba51d2	76	extern struct list_head huge_boot_pages;
1da177e4	77
63551ae0 DG	78	/* arch callbacks */
63551ae0 DG	79
a5516438 AK	80	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	81	unsigned long addr, unsigned long sz);
63551ae0	82	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	83	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	84	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	85	int write);
	86	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	87	pmd_t *pmd, int write);
ceb86879 AK	88	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	89	pud_t *pud, int write);
63551ae0	90	int pmd_huge(pmd_t pmd);
ceb86879	91	int pud_huge(pud_t pmd);
7da4d641	92	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	93	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	94
1da177e4 LT	95	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	96
20a0307c WF	97	static inline int PageHuge(struct page *page)
	98	{
	99	return 0;
	100	}
	101
17b6ada0 AA	102	static inline int PageHeadHuge(struct page *page_head)
	103	{
	104	return 0;
	105	}
	106
a1e78772 MG	107	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	108	{
	109	}
	110
1da177e4 LT	111	static inline unsigned long hugetlb_total_pages(void)
	112	{
	113	return 0;
	114	}
	115
5b23dbe8	116	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	117	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	118	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	119	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
e1759c21 AD	120	static inline void hugetlb_report_meminfo(struct seq_file *m)
	121	{
	122	}
1da177e4	123	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	124	static inline void hugetlb_show_meminfo(void)
	125	{
	126	}
1da177e4	127	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	128	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	129	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	130	#define pmd_huge(x) 0
ceb86879	131	#define pud_huge(x) 0
1da177e4	132	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	133	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	134	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	135	#define huge_pte_offset(mm, address) 0
24669e58 AK	136	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	137	{
	138	return 0;
	139	}
	140
0ebabb41 NH	141	static inline void copy_huge_page(struct page dst, struct page src)
	142	{
	143	}
1da177e4	144
7da4d641 PZ	145	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	146	unsigned long address, unsigned long end, pgprot_t newprot)
	147	{
	148	return 0;
	149	}
8f860591	150
d833352a MG	151	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	152	struct vm_area_struct *vma, unsigned long start,
	153	unsigned long end, struct page *ref_page)
	154	{
	155	BUG();
	156	}
	157
24669e58 AK	158	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	159	struct vm_area_struct *vma, unsigned long start,
	160	unsigned long end, struct page *ref_page)
	161	{
	162	BUG();
	163	}
	164
1da177e4 LT	165	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	166
4e52780d EM	167	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	168
6bfde05b EM	169	enum {
	170	/*
	171	* The file will be used as an shm file so shmfs accounting rules
	172	* apply
	173	*/
	174	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	175	/*
	176	* The file is being created on the internal vfs mount and shmfs
	177	* accounting rules do not apply
	178	*/
	179	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	180	};
6bfde05b EM	181
1da177e4	182	#ifdef CONFIG_HUGETLBFS
1da177e4	183	struct hugetlbfs_sb_info {
1da177e4 LT	184	long max_inodes; /* inodes allowed */
	185	long free_inodes; /* inodes free */
	186	spinlock_t stat_lock;
a137e1cc	187	struct hstate *hstate;
90481622	188	struct hugepage_subpool *spool;
1da177e4 LT	189	};
1da177e4 LT	190
1da177e4 LT	191	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	192	{
	193	return sb->s_fs_info;
	194	}
	195
4b6f5d20	196	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	197	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	198	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	199	struct user_struct **user, int creat_flags,
42d7395f AK	200	int page_size_log);
1da177e4 LT	201
	202	static inline int is_file_hugepages(struct file *file)
	203	{
516dffdc AL	204	if (file->f_op == &hugetlbfs_file_operations)
	205	return 1;
	206	if (is_file_shm_hugepages(file))
	207	return 1;
	208
	209	return 0;
1da177e4 LT	210	}
1da177e4 LT	211
42d7395f	212
1da177e4 LT	213	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	214
1db8508c	215	#define is_file_hugepages(file) 0
40716e29	216	static inline struct file *
af73e4d9 NH	217	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	218	struct user_struct **user, int creat_flags,
42d7395f	219	int page_size_log)
e9ea0e2d AM	220	{
	221	return ERR_PTR(-ENOSYS);
	222	}
1da177e4 LT	223
	224	#endif /* !CONFIG_HUGETLBFS */
	225
d2ba27e8 AB	226	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	227	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	228	unsigned long len, unsigned long pgoff,
	229	unsigned long flags);
	230	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	231
a5516438 AK	232	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	233
a3437870	234	#define HSTATE_NAME_LEN 32
a5516438 AK	235	/* Defines one hugetlb page size */
a5516438 AK	236	struct hstate {
e8c5c824 LS	237	int next_nid_to_alloc;
e8c5c824 LS	238	int next_nid_to_free;
a5516438 AK	239	unsigned int order;
	240	unsigned long mask;
	241	unsigned long max_huge_pages;
	242	unsigned long nr_huge_pages;
	243	unsigned long free_huge_pages;
	244	unsigned long resv_huge_pages;
	245	unsigned long surplus_huge_pages;
	246	unsigned long nr_overcommit_huge_pages;
0edaecfa	247	struct list_head hugepage_activelist;
a5516438 AK	248	struct list_head hugepage_freelists[MAX_NUMNODES];
	249	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	250	unsigned int free_huge_pages_node[MAX_NUMNODES];
	251	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	252	#ifdef CONFIG_CGROUP_HUGETLB
	253	/* cgroup control files */
	254	struct cftype cgroup_files[5];
	255	#endif
a3437870	256	char name[HSTATE_NAME_LEN];
a5516438 AK	257	};
a5516438 AK	258
53ba51d2 JT	259	struct huge_bootmem_page {
	260	struct list_head list;
	261	struct hstate *hstate;
ee8f248d BB	262	#ifdef CONFIG_HIGHMEM
	263	phys_addr_t phys;
	264	#endif
53ba51d2 JT	265	};
53ba51d2 JT	266
bf50bab2 NH	267	struct page alloc_huge_page_node(struct hstate h, int nid);
bf50bab2 NH	268
53ba51d2 JT	269	/* arch callback */
	270	int __init alloc_bootmem_huge_page(struct hstate *h);
	271
e5ff2159 AK	272	void __init hugetlb_add_hstate(unsigned order);
	273	struct hstate *size_to_hstate(unsigned long size);
	274
	275	#ifndef HUGE_MAX_HSTATE
	276	#define HUGE_MAX_HSTATE 1
	277	#endif
	278
	279	extern struct hstate hstates[HUGE_MAX_HSTATE];
	280	extern unsigned int default_hstate_idx;
	281
	282	#define default_hstate (hstates[default_hstate_idx])
a5516438	283
a137e1cc	284	static inline struct hstate hstate_inode(struct inode i)
a5516438	285	{
a137e1cc AK	286	struct hugetlbfs_sb_info *hsb;
	287	hsb = HUGETLBFS_SB(i->i_sb);
	288	return hsb->hstate;
a5516438 AK	289	}
	290
	291	static inline struct hstate hstate_file(struct file f)
	292	{
496ad9aa	293	return hstate_inode(file_inode(f));
a5516438 AK	294	}
a5516438 AK	295
af73e4d9 NH	296	static inline struct hstate *hstate_sizelog(int page_size_log)
	297	{
	298	if (!page_size_log)
	299	return &default_hstate;
	300	return size_to_hstate(1 << page_size_log);
	301	}
	302
a137e1cc	303	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	304	{
a137e1cc	305	return hstate_file(vma->vm_file);
a5516438 AK	306	}
	307
	308	static inline unsigned long huge_page_size(struct hstate *h)
	309	{
	310	return (unsigned long)PAGE_SIZE << h->order;
	311	}
	312
08fba699 MG	313	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	314
3340289d MG	315	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	316
a5516438 AK	317	static inline unsigned long huge_page_mask(struct hstate *h)
	318	{
	319	return h->mask;
	320	}
	321
	322	static inline unsigned int huge_page_order(struct hstate *h)
	323	{
	324	return h->order;
	325	}
	326
	327	static inline unsigned huge_page_shift(struct hstate *h)
	328	{
	329	return h->order + PAGE_SHIFT;
	330	}
	331
	332	static inline unsigned int pages_per_huge_page(struct hstate *h)
	333	{
	334	return 1 << h->order;
	335	}
	336
	337	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	338	{
	339	return huge_page_size(h) / 512;
	340	}
	341
	342	#include <asm/hugetlb.h>
	343
d9ed9faa CM	344	#ifndef arch_make_huge_pte
	345	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	346	struct page *page, int writable)
	347	{
	348	return entry;
	349	}
	350	#endif
	351
e5ff2159 AK	352	static inline struct hstate page_hstate(struct page page)
	353	{
	354	return size_to_hstate(PAGE_SIZE << compound_order(page));
	355	}
	356
aa50d3a7 AK	357	static inline unsigned hstate_index_to_shift(unsigned index)
	358	{
	359	return hstates[index].order + PAGE_SHIFT;
	360	}
	361
972dc4de AK	362	static inline int hstate_index(struct hstate *h)
	363	{
	364	return h - hstates;
	365	}
	366
ab1842f1 ZY	367	pgoff_t __basepage_index(struct page *page);
	368
	369	/* Return page->index in PAGE_SIZE units */
	370	static inline pgoff_t basepage_index(struct page *page)
	371	{
	372	if (!PageCompound(page))
	373	return page->index;
	374
	375	return __basepage_index(page);
	376	}
	377
af73e4d9	378	#else /* CONFIG_HUGETLB_PAGE */
a5516438	379	struct hstate {};
bf50bab2	380	#define alloc_huge_page_node(h, nid) NULL
53ba51d2	381	#define alloc_bootmem_huge_page(h) NULL
a5516438	382	#define hstate_file(f) NULL
af73e4d9	383	#define hstate_sizelog(s) NULL
a5516438 AK	384	#define hstate_vma(v) NULL
	385	#define hstate_inode(i) NULL
	386	#define huge_page_size(h) PAGE_SIZE
	387	#define huge_page_mask(h) PAGE_MASK
08fba699	388	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	389	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	390	#define huge_page_order(h) 0
a5516438 AK	391	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	392	static inline unsigned int pages_per_huge_page(struct hstate *h)
	393	{
	394	return 1;
	395	}
aa50d3a7	396	#define hstate_index_to_shift(index) 0
972dc4de	397	#define hstate_index(h) 0
ab1842f1 ZY	398
	399	static inline pgoff_t basepage_index(struct page *page)
	400	{
	401	return page->index;
	402	}
af73e4d9	403	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	404
1da177e4	405	#endif /* _LINUX_HUGETLB_H */