[deliverable/linux.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/fs.h>
#include <linux/hugetlb_inline.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);

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 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	4	#include <linux/fs.h>
8edf344c	5	#include <linux/hugetlb_inline.h>
4e950f6f	6
e9ea0e2d AM	7	struct ctl_table;
	8	struct user_struct;
	9
1da177e4 LT	10	#ifdef CONFIG_HUGETLB_PAGE
	11
	12	#include <linux/mempolicy.h>
516dffdc	13	#include <linux/shm.h>
63551ae0	14	#include <asm/tlbflush.h>
1da177e4	15
20a0307c WF	16	int PageHuge(struct page *page);
20a0307c WF	17
a1e78772	18	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	19	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	20	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	21	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	22
	23	#ifdef CONFIG_NUMA
	24	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	25	void __user , size_t , loff_t *);
	26	#endif
	27
1da177e4	28	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
2a15efc9 HD	29	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	30	struct page , struct vm_area_struct ,
	31	unsigned long , int , int, unsigned int flags);
04f2cbe3 MG	32	void unmap_hugepage_range(struct vm_area_struct *,
	33	unsigned long, unsigned long, struct page *);
	34	void __unmap_hugepage_range(struct vm_area_struct *,
	35	unsigned long, unsigned long, struct page *);
1da177e4	36	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	37	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	38	int hugetlb_report_node_meminfo(int, char *);
1da177e4	39	unsigned long hugetlb_total_pages(void);
ac9b9c66	40	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	41	unsigned long address, unsigned int flags);
a1e78772	42	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125 MG	43	struct vm_area_struct *vma,
5a6fe125 MG	44	int acctflags);
a43a8c39	45	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4	46
396faf03	47	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	48	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	49	extern int sysctl_hugetlb_shm_group;
53ba51d2	50	extern struct list_head huge_boot_pages;
1da177e4	51
63551ae0 DG	52	/* arch callbacks */
63551ae0 DG	53
a5516438 AK	54	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	55	unsigned long addr, unsigned long sz);
63551ae0	56	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	57	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	58	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	59	int write);
	60	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	61	pmd_t *pmd, int write);
ceb86879 AK	62	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	63	pud_t *pud, int write);
63551ae0	64	int pmd_huge(pmd_t pmd);
ceb86879	65	int pud_huge(pud_t pmd);
8f860591 ZY	66	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	67	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	68
1da177e4 LT	69	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	70
20a0307c WF	71	static inline int PageHuge(struct page *page)
	72	{
	73	return 0;
	74	}
	75
a1e78772 MG	76	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	77	{
	78	}
	79
1da177e4 LT	80	static inline unsigned long hugetlb_total_pages(void)
	81	{
	82	return 0;
	83	}
	84
5b23dbe8	85	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	86	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	87	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	88	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
04f2cbe3	89	#define unmap_hugepage_range(vma, start, end, page) BUG()
e1759c21 AD	90	static inline void hugetlb_report_meminfo(struct seq_file *m)
	91	{
	92	}
1da177e4 LT	93	#define hugetlb_report_node_meminfo(n, buf) 0
1da177e4 LT	94	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	95	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	96	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	97	#define pmd_huge(x) 0
ceb86879	98	#define pud_huge(x) 0
1da177e4	99	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	100	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	101	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
1da177e4	102
8f860591 ZY	103	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	104
1da177e4	105	#ifndef HPAGE_MASK
51c6f666 RH	106	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	107	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	108	#endif
	109
	110	#endif /* !CONFIG_HUGETLB_PAGE */
	111
4e52780d EM	112	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	113
6bfde05b EM	114	enum {
	115	/*
	116	* The file will be used as an shm file so shmfs accounting rules
	117	* apply
	118	*/
	119	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	120	/*
	121	* The file is being created on the internal vfs mount and shmfs
	122	* accounting rules do not apply
	123	*/
	124	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	125	};
6bfde05b EM	126
1da177e4 LT	127	#ifdef CONFIG_HUGETLBFS
	128	struct hugetlbfs_config {
	129	uid_t uid;
	130	gid_t gid;
	131	umode_t mode;
	132	long nr_blocks;
	133	long nr_inodes;
a137e1cc	134	struct hstate *hstate;
1da177e4 LT	135	};
	136
	137	struct hugetlbfs_sb_info {
	138	long max_blocks; /* blocks allowed */
	139	long free_blocks; /* blocks free */
	140	long max_inodes; /* inodes allowed */
	141	long free_inodes; /* inodes free */
	142	spinlock_t stat_lock;
a137e1cc	143	struct hstate *hstate;
1da177e4 LT	144	};
	145
	146
	147	struct hugetlbfs_inode_info {
	148	struct shared_policy policy;
	149	struct inode vfs_inode;
	150	};
	151
	152	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	153	{
	154	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	155	}
	156
	157	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	158	{
	159	return sb->s_fs_info;
	160	}
	161
4b6f5d20	162	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	163	extern const struct vm_operations_struct hugetlb_vm_ops;
353d5c30	164	struct file hugetlb_file_setup(const char name, size_t size, int acct,
6bfde05b	165	struct user_struct **user, int creat_flags);
9a119c05 AL	166	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	167	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4 LT	168
	169	static inline int is_file_hugepages(struct file *file)
	170	{
516dffdc AL	171	if (file->f_op == &hugetlbfs_file_operations)
	172	return 1;
	173	if (is_file_shm_hugepages(file))
	174	return 1;
	175
	176	return 0;
1da177e4 LT	177	}
	178
	179	static inline void set_file_hugepages(struct file *file)
	180	{
	181	file->f_op = &hugetlbfs_file_operations;
	182	}
	183	#else /* !CONFIG_HUGETLBFS */
	184
1db8508c SR	185	#define is_file_hugepages(file) 0
1db8508c SR	186	#define set_file_hugepages(file) BUG()
e9ea0e2d AM	187	static inline struct file hugetlb_file_setup(const char name, size_t size,
	188	int acctflag, struct user_struct **user, int creat_flags)
	189	{
	190	return ERR_PTR(-ENOSYS);
	191	}
1da177e4 LT	192
	193	#endif /* !CONFIG_HUGETLBFS */
	194
d2ba27e8 AB	195	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	196	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	197	unsigned long len, unsigned long pgoff,
	198	unsigned long flags);
	199	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	200
a5516438 AK	201	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	202
a3437870	203	#define HSTATE_NAME_LEN 32
a5516438 AK	204	/* Defines one hugetlb page size */
a5516438 AK	205	struct hstate {
e8c5c824 LS	206	int next_nid_to_alloc;
e8c5c824 LS	207	int next_nid_to_free;
a5516438 AK	208	unsigned int order;
	209	unsigned long mask;
	210	unsigned long max_huge_pages;
	211	unsigned long nr_huge_pages;
	212	unsigned long free_huge_pages;
	213	unsigned long resv_huge_pages;
	214	unsigned long surplus_huge_pages;
	215	unsigned long nr_overcommit_huge_pages;
	216	struct list_head hugepage_freelists[MAX_NUMNODES];
	217	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	218	unsigned int free_huge_pages_node[MAX_NUMNODES];
	219	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
a3437870	220	char name[HSTATE_NAME_LEN];
a5516438 AK	221	};
a5516438 AK	222
53ba51d2 JT	223	struct huge_bootmem_page {
	224	struct list_head list;
	225	struct hstate *hstate;
	226	};
	227
	228	/* arch callback */
	229	int __init alloc_bootmem_huge_page(struct hstate *h);
	230
e5ff2159 AK	231	void __init hugetlb_add_hstate(unsigned order);
	232	struct hstate *size_to_hstate(unsigned long size);
	233
	234	#ifndef HUGE_MAX_HSTATE
	235	#define HUGE_MAX_HSTATE 1
	236	#endif
	237
	238	extern struct hstate hstates[HUGE_MAX_HSTATE];
	239	extern unsigned int default_hstate_idx;
	240
	241	#define default_hstate (hstates[default_hstate_idx])
a5516438	242
a137e1cc	243	static inline struct hstate hstate_inode(struct inode i)
a5516438	244	{
a137e1cc AK	245	struct hugetlbfs_sb_info *hsb;
	246	hsb = HUGETLBFS_SB(i->i_sb);
	247	return hsb->hstate;
a5516438 AK	248	}
	249
	250	static inline struct hstate hstate_file(struct file f)
	251	{
a137e1cc	252	return hstate_inode(f->f_dentry->d_inode);
a5516438 AK	253	}
a5516438 AK	254
a137e1cc	255	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	256	{
a137e1cc	257	return hstate_file(vma->vm_file);
a5516438 AK	258	}
	259
	260	static inline unsigned long huge_page_size(struct hstate *h)
	261	{
	262	return (unsigned long)PAGE_SIZE << h->order;
	263	}
	264
08fba699 MG	265	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	266
3340289d MG	267	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	268
a5516438 AK	269	static inline unsigned long huge_page_mask(struct hstate *h)
	270	{
	271	return h->mask;
	272	}
	273
	274	static inline unsigned int huge_page_order(struct hstate *h)
	275	{
	276	return h->order;
	277	}
	278
	279	static inline unsigned huge_page_shift(struct hstate *h)
	280	{
	281	return h->order + PAGE_SHIFT;
	282	}
	283
	284	static inline unsigned int pages_per_huge_page(struct hstate *h)
	285	{
	286	return 1 << h->order;
	287	}
	288
	289	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	290	{
	291	return huge_page_size(h) / 512;
	292	}
	293
	294	#include <asm/hugetlb.h>
	295
e5ff2159 AK	296	static inline struct hstate page_hstate(struct page page)
	297	{
	298	return size_to_hstate(PAGE_SIZE << compound_order(page));
	299	}
	300
a5516438 AK	301	#else
a5516438 AK	302	struct hstate {};
53ba51d2	303	#define alloc_bootmem_huge_page(h) NULL
a5516438 AK	304	#define hstate_file(f) NULL
	305	#define hstate_vma(v) NULL
	306	#define hstate_inode(i) NULL
	307	#define huge_page_size(h) PAGE_SIZE
	308	#define huge_page_mask(h) PAGE_MASK
08fba699	309	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	310	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	311	#define huge_page_order(h) 0
a5516438 AK	312	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	313	static inline unsigned int pages_per_huge_page(struct hstate *h)
	314	{
	315	return 1;
	316	}
a5516438 AK	317	#endif
a5516438 AK	318
1da177e4	319	#endif /* _LINUX_HUGETLB_H */