[mirror_ubuntu-focal-kernel.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);

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 *);
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			struct page **, struct vm_area_struct **,
			unsigned long *, int *, int, unsigned int flags);
void unmap_hugepage_range(struct vm_area_struct *,
			  unsigned long, unsigned long, struct 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 *);
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);
void 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 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
#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)
{
}

#define hugetlb_change_protection(vma, address, end, newprot)

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, unsigned long addr,
				size_t size, vm_flags_t acct,
				struct user_struct **user, int creat_flags);

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, unsigned long addr, size_t size,
		vm_flags_t acctflag, struct user_struct **user, int creat_flags)
{
	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(f->f_dentry->d_inode);
}

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;
}

#else
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) 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
#endif

#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 WF	33	int PageHuge(struct page *page);
20a0307c WF	34
a1e78772	35	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	36	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	37	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	38	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	39
	40	#ifdef CONFIG_NUMA
	41	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	42	void __user , size_t , loff_t *);
	43	#endif
	44
1da177e4	45	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
2a15efc9 HD	46	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	47	struct page , struct vm_area_struct ,
	48	unsigned long , int , int, unsigned int flags);
04f2cbe3	49	void unmap_hugepage_range(struct vm_area_struct *,
24669e58 AK	50	unsigned long, unsigned long, struct page *);
	51	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	52	unsigned long start, unsigned long end,
	53	struct page *ref_page);
1da177e4	54	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	55	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	56	int hugetlb_report_node_meminfo(int, char *);
1da177e4	57	unsigned long hugetlb_total_pages(void);
ac9b9c66	58	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	59	unsigned long address, unsigned int flags);
a1e78772	60	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	61	struct vm_area_struct *vma,
ca16d140	62	vm_flags_t vm_flags);
a43a8c39	63	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	64	int dequeue_hwpoisoned_huge_page(struct page *page);
0ebabb41	65	void copy_huge_page(struct page dst, struct page src);
1da177e4	66
396faf03	67	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	68	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	69	extern int sysctl_hugetlb_shm_group;
53ba51d2	70	extern struct list_head huge_boot_pages;
1da177e4	71
63551ae0 DG	72	/* arch callbacks */
63551ae0 DG	73
a5516438 AK	74	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	75	unsigned long addr, unsigned long sz);
63551ae0	76	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	77	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	78	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	79	int write);
	80	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	81	pmd_t *pmd, int write);
ceb86879 AK	82	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	83	pud_t *pud, int write);
63551ae0	84	int pmd_huge(pmd_t pmd);
ceb86879	85	int pud_huge(pud_t pmd);
8f860591 ZY	86	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	87	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	88
1da177e4 LT	89	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	90
20a0307c WF	91	static inline int PageHuge(struct page *page)
	92	{
	93	return 0;
	94	}
	95
a1e78772 MG	96	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	97	{
	98	}
	99
1da177e4 LT	100	static inline unsigned long hugetlb_total_pages(void)
	101	{
	102	return 0;
	103	}
	104
5b23dbe8	105	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	106	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	107	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	108	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
e1759c21 AD	109	static inline void hugetlb_report_meminfo(struct seq_file *m)
	110	{
	111	}
1da177e4 LT	112	#define hugetlb_report_node_meminfo(n, buf) 0
1da177e4 LT	113	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	114	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	115	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	116	#define pmd_huge(x) 0
ceb86879	117	#define pud_huge(x) 0
1da177e4	118	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	119	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	120	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	121	#define huge_pte_offset(mm, address) 0
24669e58 AK	122	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	123	{
	124	return 0;
	125	}
	126
0ebabb41 NH	127	static inline void copy_huge_page(struct page dst, struct page src)
	128	{
	129	}
1da177e4	130
8f860591 ZY	131	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	132
24669e58 AK	133	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	134	struct vm_area_struct *vma, unsigned long start,
	135	unsigned long end, struct page *ref_page)
	136	{
	137	BUG();
	138	}
	139
1da177e4 LT	140	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	141
4e52780d EM	142	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	143
6bfde05b EM	144	enum {
	145	/*
	146	* The file will be used as an shm file so shmfs accounting rules
	147	* apply
	148	*/
	149	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	150	/*
	151	* The file is being created on the internal vfs mount and shmfs
	152	* accounting rules do not apply
	153	*/
	154	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	155	};
6bfde05b EM	156
1da177e4	157	#ifdef CONFIG_HUGETLBFS
1da177e4	158	struct hugetlbfs_sb_info {
1da177e4 LT	159	long max_inodes; /* inodes allowed */
	160	long free_inodes; /* inodes free */
	161	spinlock_t stat_lock;
a137e1cc	162	struct hstate *hstate;
90481622	163	struct hugepage_subpool *spool;
1da177e4 LT	164	};
1da177e4 LT	165
1da177e4 LT	166	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	167	{
	168	return sb->s_fs_info;
	169	}
	170
4b6f5d20	171	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	172	extern const struct vm_operations_struct hugetlb_vm_ops;
40716e29 ST	173	struct file hugetlb_file_setup(const char name, unsigned long addr,
40716e29 ST	174	size_t size, vm_flags_t acct,
6bfde05b	175	struct user_struct **user, int creat_flags);
1da177e4 LT	176
	177	static inline int is_file_hugepages(struct file *file)
	178	{
516dffdc AL	179	if (file->f_op == &hugetlbfs_file_operations)
	180	return 1;
	181	if (is_file_shm_hugepages(file))
	182	return 1;
	183
	184	return 0;
1da177e4 LT	185	}
1da177e4 LT	186
1da177e4 LT	187	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	188
1db8508c	189	#define is_file_hugepages(file) 0
40716e29 ST	190	static inline struct file *
40716e29 ST	191	hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
ca16d140	192	vm_flags_t acctflag, struct user_struct **user, int creat_flags)
e9ea0e2d AM	193	{
	194	return ERR_PTR(-ENOSYS);
	195	}
1da177e4 LT	196
	197	#endif /* !CONFIG_HUGETLBFS */
	198
d2ba27e8 AB	199	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	200	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	201	unsigned long len, unsigned long pgoff,
	202	unsigned long flags);
	203	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	204
a5516438 AK	205	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	206
a3437870	207	#define HSTATE_NAME_LEN 32
a5516438 AK	208	/* Defines one hugetlb page size */
a5516438 AK	209	struct hstate {
e8c5c824 LS	210	int next_nid_to_alloc;
e8c5c824 LS	211	int next_nid_to_free;
a5516438 AK	212	unsigned int order;
	213	unsigned long mask;
	214	unsigned long max_huge_pages;
	215	unsigned long nr_huge_pages;
	216	unsigned long free_huge_pages;
	217	unsigned long resv_huge_pages;
	218	unsigned long surplus_huge_pages;
	219	unsigned long nr_overcommit_huge_pages;
0edaecfa	220	struct list_head hugepage_activelist;
a5516438 AK	221	struct list_head hugepage_freelists[MAX_NUMNODES];
	222	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	223	unsigned int free_huge_pages_node[MAX_NUMNODES];
	224	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	225	#ifdef CONFIG_CGROUP_HUGETLB
	226	/* cgroup control files */
	227	struct cftype cgroup_files[5];
	228	#endif
a3437870	229	char name[HSTATE_NAME_LEN];
a5516438 AK	230	};
a5516438 AK	231
53ba51d2 JT	232	struct huge_bootmem_page {
	233	struct list_head list;
	234	struct hstate *hstate;
ee8f248d BB	235	#ifdef CONFIG_HIGHMEM
	236	phys_addr_t phys;
	237	#endif
53ba51d2 JT	238	};
53ba51d2 JT	239
bf50bab2 NH	240	struct page alloc_huge_page_node(struct hstate h, int nid);
bf50bab2 NH	241
53ba51d2 JT	242	/* arch callback */
	243	int __init alloc_bootmem_huge_page(struct hstate *h);
	244
e5ff2159 AK	245	void __init hugetlb_add_hstate(unsigned order);
	246	struct hstate *size_to_hstate(unsigned long size);
	247
	248	#ifndef HUGE_MAX_HSTATE
	249	#define HUGE_MAX_HSTATE 1
	250	#endif
	251
	252	extern struct hstate hstates[HUGE_MAX_HSTATE];
	253	extern unsigned int default_hstate_idx;
	254
	255	#define default_hstate (hstates[default_hstate_idx])
a5516438	256
a137e1cc	257	static inline struct hstate hstate_inode(struct inode i)
a5516438	258	{
a137e1cc AK	259	struct hugetlbfs_sb_info *hsb;
	260	hsb = HUGETLBFS_SB(i->i_sb);
	261	return hsb->hstate;
a5516438 AK	262	}
	263
	264	static inline struct hstate hstate_file(struct file f)
	265	{
a137e1cc	266	return hstate_inode(f->f_dentry->d_inode);
a5516438 AK	267	}
a5516438 AK	268
a137e1cc	269	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	270	{
a137e1cc	271	return hstate_file(vma->vm_file);
a5516438 AK	272	}
	273
	274	static inline unsigned long huge_page_size(struct hstate *h)
	275	{
	276	return (unsigned long)PAGE_SIZE << h->order;
	277	}
	278
08fba699 MG	279	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	280
3340289d MG	281	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	282
a5516438 AK	283	static inline unsigned long huge_page_mask(struct hstate *h)
	284	{
	285	return h->mask;
	286	}
	287
	288	static inline unsigned int huge_page_order(struct hstate *h)
	289	{
	290	return h->order;
	291	}
	292
	293	static inline unsigned huge_page_shift(struct hstate *h)
	294	{
	295	return h->order + PAGE_SHIFT;
	296	}
	297
	298	static inline unsigned int pages_per_huge_page(struct hstate *h)
	299	{
	300	return 1 << h->order;
	301	}
	302
	303	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	304	{
	305	return huge_page_size(h) / 512;
	306	}
	307
	308	#include <asm/hugetlb.h>
	309
d9ed9faa CM	310	#ifndef arch_make_huge_pte
	311	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	312	struct page *page, int writable)
	313	{
	314	return entry;
	315	}
	316	#endif
	317
e5ff2159 AK	318	static inline struct hstate page_hstate(struct page page)
	319	{
	320	return size_to_hstate(PAGE_SIZE << compound_order(page));
	321	}
	322
aa50d3a7 AK	323	static inline unsigned hstate_index_to_shift(unsigned index)
	324	{
	325	return hstates[index].order + PAGE_SHIFT;
	326	}
	327
972dc4de AK	328	static inline int hstate_index(struct hstate *h)
	329	{
	330	return h - hstates;
	331	}
	332
a5516438 AK	333	#else
a5516438 AK	334	struct hstate {};
bf50bab2	335	#define alloc_huge_page_node(h, nid) NULL
53ba51d2	336	#define alloc_bootmem_huge_page(h) NULL
a5516438 AK	337	#define hstate_file(f) NULL
	338	#define hstate_vma(v) NULL
	339	#define hstate_inode(i) NULL
	340	#define huge_page_size(h) PAGE_SIZE
	341	#define huge_page_mask(h) PAGE_MASK
08fba699	342	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	343	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	344	#define huge_page_order(h) 0
a5516438 AK	345	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	346	static inline unsigned int pages_per_huge_page(struct hstate *h)
	347	{
	348	return 1;
	349	}
aa50d3a7	350	#define hstate_index_to_shift(index) 0
972dc4de	351	#define hstate_index(h) 0
a5516438 AK	352	#endif
a5516438 AK	353
1da177e4	354	#endif /* _LINUX_HUGETLB_H */