[mirror_ubuntu-bionic-kernel.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/fs.h>

struct ctl_table;
struct user_struct;

#ifdef CONFIG_HUGETLB_PAGE

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

int PageHuge(struct page *page);

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return vma->vm_flags & VM_HUGETLB;
}

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 vm_area_struct *,
			unsigned long, unsigned long, struct 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,
						int acctflags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);

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 int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	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; })
#define unmap_hugepage_range(vma, start, end, page)	BUG()
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 hugetlb_change_protection(vma, address, end, newprot)

#ifndef HPAGE_MASK
#define HPAGE_MASK	PAGE_MASK		/* Keep the compiler happy */
#define HPAGE_SIZE	PAGE_SIZE
#endif

#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_config {
	uid_t   uid;
	gid_t   gid;
	umode_t mode;
	long	nr_blocks;
	long	nr_inodes;
	struct hstate *hstate;
};

struct hugetlbfs_sb_info {
	long	max_blocks;   /* blocks allowed */
	long	free_blocks;  /* blocks free */
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
	struct hstate *hstate;
};


struct hugetlbfs_inode_info {
	struct shared_policy policy;
	struct inode vfs_inode;
};

static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

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, int acct,
				struct user_struct **user, int creat_flags);
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);

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;
}

static inline void set_file_hugepages(struct file *file)
{
	file->f_op = &hugetlbfs_file_operations;
}
#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			0
#define set_file_hugepages(file)		BUG()
static inline struct file *hugetlb_file_setup(const char *name, size_t size,
		int 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;
};

/* 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>

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

#else
struct hstate {};
#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;
}
#endif

#endif /* _LINUX_HUGETLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
4e950f6f AD	4	#include <linux/fs.h>
4e950f6f AD	5
e9ea0e2d AM	6	struct ctl_table;
	7	struct user_struct;
	8
1da177e4 LT	9	#ifdef CONFIG_HUGETLB_PAGE
	10
	11	#include <linux/mempolicy.h>
516dffdc	12	#include <linux/shm.h>
63551ae0	13	#include <asm/tlbflush.h>
1da177e4	14
20a0307c WF	15	int PageHuge(struct page *page);
20a0307c WF	16
1da177e4 LT	17	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	18	{
	19	return vma->vm_flags & VM_HUGETLB;
	20	}
	21
a1e78772	22	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	23	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	24	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	25	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	26
	27	#ifdef CONFIG_NUMA
	28	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	29	void __user , size_t , loff_t *);
	30	#endif
	31
1da177e4	32	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
2a15efc9 HD	33	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	34	struct page , struct vm_area_struct ,
	35	unsigned long , int , int, unsigned int flags);
04f2cbe3 MG	36	void unmap_hugepage_range(struct vm_area_struct *,
	37	unsigned long, unsigned long, struct page *);
	38	void __unmap_hugepage_range(struct vm_area_struct *,
	39	unsigned long, unsigned long, struct page *);
1da177e4	40	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	41	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	42	int hugetlb_report_node_meminfo(int, char *);
1da177e4	43	unsigned long hugetlb_total_pages(void);
ac9b9c66	44	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	45	unsigned long address, unsigned int flags);
a1e78772	46	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125 MG	47	struct vm_area_struct *vma,
5a6fe125 MG	48	int acctflags);
a43a8c39	49	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4	50
396faf03	51	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	52	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	53	extern int sysctl_hugetlb_shm_group;
53ba51d2	54	extern struct list_head huge_boot_pages;
1da177e4	55
63551ae0 DG	56	/* arch callbacks */
63551ae0 DG	57
a5516438 AK	58	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	59	unsigned long addr, unsigned long sz);
63551ae0	60	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	61	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	62	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	63	int write);
	64	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	65	pmd_t *pmd, int write);
ceb86879 AK	66	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	67	pud_t *pud, int write);
63551ae0	68	int pmd_huge(pmd_t pmd);
ceb86879	69	int pud_huge(pud_t pmd);
8f860591 ZY	70	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	71	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	72
1da177e4 LT	73	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	74
20a0307c WF	75	static inline int PageHuge(struct page *page)
	76	{
	77	return 0;
	78	}
	79
1da177e4 LT	80	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	81	{
	82	return 0;
	83	}
a1e78772 MG	84
	85	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	86	{
	87	}
	88
1da177e4 LT	89	static inline unsigned long hugetlb_total_pages(void)
	90	{
	91	return 0;
	92	}
	93
5b23dbe8	94	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	95	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	96	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	97	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
04f2cbe3	98	#define unmap_hugepage_range(vma, start, end, page) BUG()
e1759c21 AD	99	static inline void hugetlb_report_meminfo(struct seq_file *m)
	100	{
	101	}
1da177e4 LT	102	#define hugetlb_report_node_meminfo(n, buf) 0
1da177e4 LT	103	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	104	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	105	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	106	#define pmd_huge(x) 0
ceb86879	107	#define pud_huge(x) 0
1da177e4	108	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	109	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	110	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
1da177e4	111
8f860591 ZY	112	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	113
1da177e4	114	#ifndef HPAGE_MASK
51c6f666 RH	115	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	116	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	117	#endif
	118
	119	#endif /* !CONFIG_HUGETLB_PAGE */
	120
4e52780d EM	121	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	122
6bfde05b EM	123	enum {
	124	/*
	125	* The file will be used as an shm file so shmfs accounting rules
	126	* apply
	127	*/
	128	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	129	/*
	130	* The file is being created on the internal vfs mount and shmfs
	131	* accounting rules do not apply
	132	*/
	133	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	134	};
6bfde05b EM	135
1da177e4 LT	136	#ifdef CONFIG_HUGETLBFS
	137	struct hugetlbfs_config {
	138	uid_t uid;
	139	gid_t gid;
	140	umode_t mode;
	141	long nr_blocks;
	142	long nr_inodes;
a137e1cc	143	struct hstate *hstate;
1da177e4 LT	144	};
	145
	146	struct hugetlbfs_sb_info {
	147	long max_blocks; /* blocks allowed */
	148	long free_blocks; /* blocks free */
	149	long max_inodes; /* inodes allowed */
	150	long free_inodes; /* inodes free */
	151	spinlock_t stat_lock;
a137e1cc	152	struct hstate *hstate;
1da177e4 LT	153	};
	154
	155
	156	struct hugetlbfs_inode_info {
	157	struct shared_policy policy;
	158	struct inode vfs_inode;
	159	};
	160
	161	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	162	{
	163	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	164	}
	165
	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;
353d5c30	173	struct file hugetlb_file_setup(const char name, size_t size, int acct,
6bfde05b	174	struct user_struct **user, int creat_flags);
9a119c05 AL	175	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	176	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4 LT	177
	178	static inline int is_file_hugepages(struct file *file)
	179	{
516dffdc AL	180	if (file->f_op == &hugetlbfs_file_operations)
	181	return 1;
	182	if (is_file_shm_hugepages(file))
	183	return 1;
	184
	185	return 0;
1da177e4 LT	186	}
	187
	188	static inline void set_file_hugepages(struct file *file)
	189	{
	190	file->f_op = &hugetlbfs_file_operations;
	191	}
	192	#else /* !CONFIG_HUGETLBFS */
	193
1db8508c SR	194	#define is_file_hugepages(file) 0
1db8508c SR	195	#define set_file_hugepages(file) BUG()
e9ea0e2d AM	196	static inline struct file hugetlb_file_setup(const char name, size_t size,
	197	int acctflag, struct user_struct **user, int creat_flags)
	198	{
	199	return ERR_PTR(-ENOSYS);
	200	}
1da177e4 LT	201
	202	#endif /* !CONFIG_HUGETLBFS */
	203
d2ba27e8 AB	204	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	205	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	206	unsigned long len, unsigned long pgoff,
	207	unsigned long flags);
	208	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	209
a5516438 AK	210	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	211
a3437870	212	#define HSTATE_NAME_LEN 32
a5516438 AK	213	/* Defines one hugetlb page size */
a5516438 AK	214	struct hstate {
e8c5c824 LS	215	int next_nid_to_alloc;
e8c5c824 LS	216	int next_nid_to_free;
a5516438 AK	217	unsigned int order;
	218	unsigned long mask;
	219	unsigned long max_huge_pages;
	220	unsigned long nr_huge_pages;
	221	unsigned long free_huge_pages;
	222	unsigned long resv_huge_pages;
	223	unsigned long surplus_huge_pages;
	224	unsigned long nr_overcommit_huge_pages;
	225	struct list_head hugepage_freelists[MAX_NUMNODES];
	226	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	227	unsigned int free_huge_pages_node[MAX_NUMNODES];
	228	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
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;
	235	};
	236
	237	/* arch callback */
	238	int __init alloc_bootmem_huge_page(struct hstate *h);
	239
e5ff2159 AK	240	void __init hugetlb_add_hstate(unsigned order);
	241	struct hstate *size_to_hstate(unsigned long size);
	242
	243	#ifndef HUGE_MAX_HSTATE
	244	#define HUGE_MAX_HSTATE 1
	245	#endif
	246
	247	extern struct hstate hstates[HUGE_MAX_HSTATE];
	248	extern unsigned int default_hstate_idx;
	249
	250	#define default_hstate (hstates[default_hstate_idx])
a5516438	251
a137e1cc	252	static inline struct hstate hstate_inode(struct inode i)
a5516438	253	{
a137e1cc AK	254	struct hugetlbfs_sb_info *hsb;
	255	hsb = HUGETLBFS_SB(i->i_sb);
	256	return hsb->hstate;
a5516438 AK	257	}
	258
	259	static inline struct hstate hstate_file(struct file f)
	260	{
a137e1cc	261	return hstate_inode(f->f_dentry->d_inode);
a5516438 AK	262	}
a5516438 AK	263
a137e1cc	264	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	265	{
a137e1cc	266	return hstate_file(vma->vm_file);
a5516438 AK	267	}
	268
	269	static inline unsigned long huge_page_size(struct hstate *h)
	270	{
	271	return (unsigned long)PAGE_SIZE << h->order;
	272	}
	273
08fba699 MG	274	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	275
3340289d MG	276	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	277
a5516438 AK	278	static inline unsigned long huge_page_mask(struct hstate *h)
	279	{
	280	return h->mask;
	281	}
	282
	283	static inline unsigned int huge_page_order(struct hstate *h)
	284	{
	285	return h->order;
	286	}
	287
	288	static inline unsigned huge_page_shift(struct hstate *h)
	289	{
	290	return h->order + PAGE_SHIFT;
	291	}
	292
	293	static inline unsigned int pages_per_huge_page(struct hstate *h)
	294	{
	295	return 1 << h->order;
	296	}
	297
	298	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	299	{
	300	return huge_page_size(h) / 512;
	301	}
	302
	303	#include <asm/hugetlb.h>
	304
e5ff2159 AK	305	static inline struct hstate page_hstate(struct page page)
	306	{
	307	return size_to_hstate(PAGE_SIZE << compound_order(page));
	308	}
	309
a5516438 AK	310	#else
a5516438 AK	311	struct hstate {};
53ba51d2	312	#define alloc_bootmem_huge_page(h) NULL
a5516438 AK	313	#define hstate_file(f) NULL
	314	#define hstate_vma(v) NULL
	315	#define hstate_inode(i) NULL
	316	#define huge_page_size(h) PAGE_SIZE
	317	#define huge_page_mask(h) PAGE_MASK
08fba699	318	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	319	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	320	#define huge_page_order(h) 0
a5516438 AK	321	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	322	static inline unsigned int pages_per_huge_page(struct hstate *h)
	323	{
	324	return 1;
	325	}
a5516438 AK	326	#endif
a5516438 AK	327
1da177e4	328	#endif /* _LINUX_HUGETLB_H */