[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>

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;
};

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_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];
	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>
4e950f6f	7
e9ea0e2d AM	8	struct ctl_table;
e9ea0e2d AM	9	struct user_struct;
24669e58	10	struct mmu_gather;
e9ea0e2d	11
1da177e4 LT	12	#ifdef CONFIG_HUGETLB_PAGE
	13
	14	#include <linux/mempolicy.h>
516dffdc	15	#include <linux/shm.h>
63551ae0	16	#include <asm/tlbflush.h>
1da177e4	17
90481622 DG	18	struct hugepage_subpool {
	19	spinlock_t lock;
	20	long count;
	21	long max_hpages, used_hpages;
	22	};
	23
	24	struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
	25	void hugepage_put_subpool(struct hugepage_subpool *spool);
	26
20a0307c WF	27	int PageHuge(struct page *page);
20a0307c WF	28
a1e78772	29	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	30	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	31	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	32	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	33
	34	#ifdef CONFIG_NUMA
	35	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	36	void __user , size_t , loff_t *);
	37	#endif
	38
1da177e4	39	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
2a15efc9 HD	40	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	41	struct page , struct vm_area_struct ,
	42	unsigned long , int , int, unsigned int flags);
04f2cbe3	43	void unmap_hugepage_range(struct vm_area_struct *,
24669e58 AK	44	unsigned long, unsigned long, struct page *);
	45	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	46	unsigned long start, unsigned long end,
	47	struct page *ref_page);
1da177e4	48	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	49	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	50	int hugetlb_report_node_meminfo(int, char *);
1da177e4	51	unsigned long hugetlb_total_pages(void);
ac9b9c66	52	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	53	unsigned long address, unsigned int flags);
a1e78772	54	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	55	struct vm_area_struct *vma,
ca16d140	56	vm_flags_t vm_flags);
a43a8c39	57	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	58	int dequeue_hwpoisoned_huge_page(struct page *page);
0ebabb41	59	void copy_huge_page(struct page dst, struct page src);
1da177e4	60
396faf03	61	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	62	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	63	extern int sysctl_hugetlb_shm_group;
53ba51d2	64	extern struct list_head huge_boot_pages;
1da177e4	65
63551ae0 DG	66	/* arch callbacks */
63551ae0 DG	67
a5516438 AK	68	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	69	unsigned long addr, unsigned long sz);
63551ae0	70	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	71	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	72	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	73	int write);
	74	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	75	pmd_t *pmd, int write);
ceb86879 AK	76	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	77	pud_t *pud, int write);
63551ae0	78	int pmd_huge(pmd_t pmd);
ceb86879	79	int pud_huge(pud_t pmd);
8f860591 ZY	80	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	81	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	82
1da177e4 LT	83	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	84
20a0307c WF	85	static inline int PageHuge(struct page *page)
	86	{
	87	return 0;
	88	}
	89
a1e78772 MG	90	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	91	{
	92	}
	93
1da177e4 LT	94	static inline unsigned long hugetlb_total_pages(void)
	95	{
	96	return 0;
	97	}
	98
5b23dbe8	99	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	100	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	101	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	102	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
e1759c21 AD	103	static inline void hugetlb_report_meminfo(struct seq_file *m)
	104	{
	105	}
1da177e4 LT	106	#define hugetlb_report_node_meminfo(n, buf) 0
1da177e4 LT	107	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	108	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	109	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	110	#define pmd_huge(x) 0
ceb86879	111	#define pud_huge(x) 0
1da177e4	112	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	113	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	114	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	115	#define huge_pte_offset(mm, address) 0
24669e58 AK	116	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	117	{
	118	return 0;
	119	}
	120
0ebabb41 NH	121	static inline void copy_huge_page(struct page dst, struct page src)
	122	{
	123	}
1da177e4	124
8f860591 ZY	125	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	126
24669e58 AK	127	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	128	struct vm_area_struct *vma, unsigned long start,
	129	unsigned long end, struct page *ref_page)
	130	{
	131	BUG();
	132	}
	133
1da177e4 LT	134	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	135
4e52780d EM	136	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	137
6bfde05b EM	138	enum {
	139	/*
	140	* The file will be used as an shm file so shmfs accounting rules
	141	* apply
	142	*/
	143	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	144	/*
	145	* The file is being created on the internal vfs mount and shmfs
	146	* accounting rules do not apply
	147	*/
	148	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	149	};
6bfde05b EM	150
1da177e4	151	#ifdef CONFIG_HUGETLBFS
1da177e4	152	struct hugetlbfs_sb_info {
1da177e4 LT	153	long max_inodes; /* inodes allowed */
	154	long free_inodes; /* inodes free */
	155	spinlock_t stat_lock;
a137e1cc	156	struct hstate *hstate;
90481622	157	struct hugepage_subpool *spool;
1da177e4 LT	158	};
1da177e4 LT	159
1da177e4 LT	160	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	161	{
	162	return sb->s_fs_info;
	163	}
	164
4b6f5d20	165	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	166	extern const struct vm_operations_struct hugetlb_vm_ops;
40716e29 ST	167	struct file hugetlb_file_setup(const char name, unsigned long addr,
40716e29 ST	168	size_t size, vm_flags_t acct,
6bfde05b	169	struct user_struct **user, int creat_flags);
1da177e4 LT	170
	171	static inline int is_file_hugepages(struct file *file)
	172	{
516dffdc AL	173	if (file->f_op == &hugetlbfs_file_operations)
	174	return 1;
	175	if (is_file_shm_hugepages(file))
	176	return 1;
	177
	178	return 0;
1da177e4 LT	179	}
1da177e4 LT	180
1da177e4 LT	181	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	182
1db8508c	183	#define is_file_hugepages(file) 0
40716e29 ST	184	static inline struct file *
40716e29 ST	185	hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
ca16d140	186	vm_flags_t acctflag, struct user_struct **user, int creat_flags)
e9ea0e2d AM	187	{
	188	return ERR_PTR(-ENOSYS);
	189	}
1da177e4 LT	190
	191	#endif /* !CONFIG_HUGETLBFS */
	192
d2ba27e8 AB	193	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	194	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	195	unsigned long len, unsigned long pgoff,
	196	unsigned long flags);
	197	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	198
a5516438 AK	199	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	200
a3437870	201	#define HSTATE_NAME_LEN 32
a5516438 AK	202	/* Defines one hugetlb page size */
a5516438 AK	203	struct hstate {
e8c5c824 LS	204	int next_nid_to_alloc;
e8c5c824 LS	205	int next_nid_to_free;
a5516438 AK	206	unsigned int order;
	207	unsigned long mask;
	208	unsigned long max_huge_pages;
	209	unsigned long nr_huge_pages;
	210	unsigned long free_huge_pages;
	211	unsigned long resv_huge_pages;
	212	unsigned long surplus_huge_pages;
	213	unsigned long nr_overcommit_huge_pages;
	214	struct list_head hugepage_freelists[MAX_NUMNODES];
	215	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	216	unsigned int free_huge_pages_node[MAX_NUMNODES];
	217	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
a3437870	218	char name[HSTATE_NAME_LEN];
a5516438 AK	219	};
a5516438 AK	220
53ba51d2 JT	221	struct huge_bootmem_page {
	222	struct list_head list;
	223	struct hstate *hstate;
ee8f248d BB	224	#ifdef CONFIG_HIGHMEM
	225	phys_addr_t phys;
	226	#endif
53ba51d2 JT	227	};
53ba51d2 JT	228
bf50bab2 NH	229	struct page alloc_huge_page_node(struct hstate h, int nid);
bf50bab2 NH	230
53ba51d2 JT	231	/* arch callback */
	232	int __init alloc_bootmem_huge_page(struct hstate *h);
	233
e5ff2159 AK	234	void __init hugetlb_add_hstate(unsigned order);
	235	struct hstate *size_to_hstate(unsigned long size);
	236
	237	#ifndef HUGE_MAX_HSTATE
	238	#define HUGE_MAX_HSTATE 1
	239	#endif
	240
	241	extern struct hstate hstates[HUGE_MAX_HSTATE];
	242	extern unsigned int default_hstate_idx;
	243
	244	#define default_hstate (hstates[default_hstate_idx])
a5516438	245
a137e1cc	246	static inline struct hstate hstate_inode(struct inode i)
a5516438	247	{
a137e1cc AK	248	struct hugetlbfs_sb_info *hsb;
	249	hsb = HUGETLBFS_SB(i->i_sb);
	250	return hsb->hstate;
a5516438 AK	251	}
	252
	253	static inline struct hstate hstate_file(struct file f)
	254	{
a137e1cc	255	return hstate_inode(f->f_dentry->d_inode);
a5516438 AK	256	}
a5516438 AK	257
a137e1cc	258	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	259	{
a137e1cc	260	return hstate_file(vma->vm_file);
a5516438 AK	261	}
	262
	263	static inline unsigned long huge_page_size(struct hstate *h)
	264	{
	265	return (unsigned long)PAGE_SIZE << h->order;
	266	}
	267
08fba699 MG	268	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	269
3340289d MG	270	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	271
a5516438 AK	272	static inline unsigned long huge_page_mask(struct hstate *h)
	273	{
	274	return h->mask;
	275	}
	276
	277	static inline unsigned int huge_page_order(struct hstate *h)
	278	{
	279	return h->order;
	280	}
	281
	282	static inline unsigned huge_page_shift(struct hstate *h)
	283	{
	284	return h->order + PAGE_SHIFT;
	285	}
	286
	287	static inline unsigned int pages_per_huge_page(struct hstate *h)
	288	{
	289	return 1 << h->order;
	290	}
	291
	292	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	293	{
	294	return huge_page_size(h) / 512;
	295	}
	296
	297	#include <asm/hugetlb.h>
	298
d9ed9faa CM	299	#ifndef arch_make_huge_pte
	300	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	301	struct page *page, int writable)
	302	{
	303	return entry;
	304	}
	305	#endif
	306
e5ff2159 AK	307	static inline struct hstate page_hstate(struct page page)
	308	{
	309	return size_to_hstate(PAGE_SIZE << compound_order(page));
	310	}
	311
aa50d3a7 AK	312	static inline unsigned hstate_index_to_shift(unsigned index)
	313	{
	314	return hstates[index].order + PAGE_SHIFT;
	315	}
	316
972dc4de AK	317	static inline int hstate_index(struct hstate *h)
	318	{
	319	return h - hstates;
	320	}
	321
a5516438 AK	322	#else
a5516438 AK	323	struct hstate {};
bf50bab2	324	#define alloc_huge_page_node(h, nid) NULL
53ba51d2	325	#define alloc_bootmem_huge_page(h) NULL
a5516438 AK	326	#define hstate_file(f) NULL
	327	#define hstate_vma(v) NULL
	328	#define hstate_inode(i) NULL
	329	#define huge_page_size(h) PAGE_SIZE
	330	#define huge_page_mask(h) PAGE_MASK
08fba699	331	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	332	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	333	#define huge_page_order(h) 0
a5516438 AK	334	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	335	static inline unsigned int pages_per_huge_page(struct hstate *h)
	336	{
	337	return 1;
	338	}
aa50d3a7	339	#define hstate_index_to_shift(index) 0
972dc4de	340	#define hstate_index(h) 0
a5516438 AK	341	#endif
a5516438 AK	342
1da177e4	343	#endif /* _LINUX_HUGETLB_H */