[linux-2.6-block.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/mmdebug.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>
#include <linux/list.h>
#include <linux/kref.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 resv_map {
	struct kref refs;
	spinlock_t lock;
	struct list_head regions;
};
extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

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 *);
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);
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);
bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
bool is_hugepage_active(struct page *page);
void free_huge_page(struct page *page);

#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
#endif

extern unsigned long hugepages_treat_as_movable;
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 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; })
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 bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
#define putback_active_hugepage(p)	do {} while (0)
#define is_hugepage_active(x)	false

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 */
/*
 * hugepages at page global directory. If arch support
 * hugepages at pgd level, they need to define this.
 */
#ifndef pgd_huge
#define pgd_huge(x)	0
#endif

#ifndef pgd_write
static inline int pgd_write(pgd_t pgd)
{
	BUG();
	return 0;
}
#endif

#ifndef pud_write
static inline int pud_write(pud_t pud)
{
	BUG();
	return 0;
}
#endif

#ifndef is_hugepd
/*
 * Some architectures requires a hugepage directory format that is
 * required to support multiple hugepage sizes. For example
 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
 * introduced the same on powerpc. This allows for a more flexible hugepage
 * pagetable layout.
 */
typedef struct { unsigned long pd; } hugepd_t;
#define is_hugepd(hugepd) (0)
#define __hugepd(x) ((hugepd_t) { (x) })
static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
			      unsigned pdshift, unsigned long end,
			      int write, struct page **pages, int *nr)
{
	return 0;
}
#else
extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
		       unsigned pdshift, unsigned long end,
		       int write, struct page **pages, int *nr);
#endif

#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);
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);

/* 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(1UL << 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 bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) >= MAX_ORDER;
}

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)
{
	VM_BUG_ON_PAGE(!PageHuge(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);
}

extern void dissolve_free_huge_pages(unsigned long start_pfn,
				     unsigned long end_pfn);
static inline int hugepage_migration_supported(struct hstate *h)
{
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	return huge_page_shift(h) == PMD_SHIFT;
#else
	return 0;
#endif
}

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	if (huge_page_size(h) == PMD_SIZE)
		return pmd_lockptr(mm, (pmd_t *) pte);
	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	return &mm->page_table_lock;
}

static inline bool hugepages_supported(void)
{
	/*
	 * Some platform decide whether they support huge pages at boot
	 * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
	 * there is no such support
	 */
	return HPAGE_SHIFT != 0;
}

#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
#define alloc_huge_page_noerr(v, a, r) 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 page_hstate(page) 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;
}
#define dissolve_free_huge_pages(s, e)	do {} while (0)
#define hugepage_migration_supported(h)	0

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
#endif	/* CONFIG_HUGETLB_PAGE */

static inline spinlock_t *huge_pte_lock(struct hstate *h,
					struct mm_struct *mm, pte_t *pte)
{
	spinlock_t *ptl;

	ptl = huge_pte_lockptr(h, mm, pte);
	spin_lock(ptl);
	return ptl;
}

#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>
309381fe	5	#include <linux/mmdebug.h>
4e950f6f	6	#include <linux/fs.h>
8edf344c	7	#include <linux/hugetlb_inline.h>
abb8206c	8	#include <linux/cgroup.h>
9119a41e JK	9	#include <linux/list.h>
9119a41e JK	10	#include <linux/kref.h>
4e950f6f	11
e9ea0e2d AM	12	struct ctl_table;
e9ea0e2d AM	13	struct user_struct;
24669e58	14	struct mmu_gather;
e9ea0e2d	15
1da177e4 LT	16	#ifdef CONFIG_HUGETLB_PAGE
	17
	18	#include <linux/mempolicy.h>
516dffdc	19	#include <linux/shm.h>
63551ae0	20	#include <asm/tlbflush.h>
1da177e4	21
90481622 DG	22	struct hugepage_subpool {
	23	spinlock_t lock;
	24	long count;
	25	long max_hpages, used_hpages;
	26	};
	27
9119a41e JK	28	struct resv_map {
9119a41e JK	29	struct kref refs;
7b24d861	30	spinlock_t lock;
9119a41e JK	31	struct list_head regions;
	32	};
	33	extern struct resv_map *resv_map_alloc(void);
	34	void resv_map_release(struct kref *ref);
	35
c3f38a38 AK	36	extern spinlock_t hugetlb_lock;
	37	extern int hugetlb_max_hstate __read_mostly;
	38	#define for_each_hstate(h) \
	39	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	40
90481622 DG	41	struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
	42	void hugepage_put_subpool(struct hugepage_subpool *spool);
	43
20a0307c WF	44	int PageHuge(struct page *page);
20a0307c WF	45
a1e78772	46	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	47	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	48	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	49	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	50
	51	#ifdef CONFIG_NUMA
	52	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	53	void __user , size_t , loff_t *);
	54	#endif
	55
1da177e4	56	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	57	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	58	struct page , struct vm_area_struct ,
	59	unsigned long , unsigned long , long, unsigned int);
04f2cbe3	60	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	61	unsigned long, unsigned long, struct page *);
d833352a MG	62	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	63	struct vm_area_struct *vma,
	64	unsigned long start, unsigned long end,
	65	struct page *ref_page);
24669e58 AK	66	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	67	unsigned long start, unsigned long end,
	68	struct page *ref_page);
e1759c21	69	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	70	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	71	void hugetlb_show_meminfo(void);
1da177e4	72	unsigned long hugetlb_total_pages(void);
ac9b9c66	73	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	74	unsigned long address, unsigned int flags);
a1e78772	75	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	76	struct vm_area_struct *vma,
ca16d140	77	vm_flags_t vm_flags);
a43a8c39	78	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	79	int dequeue_hwpoisoned_huge_page(struct page *page);
31caf665 NH	80	bool isolate_huge_page(struct page page, struct list_head list);
31caf665 NH	81	void putback_active_hugepage(struct page *page);
c8721bbb	82	bool is_hugepage_active(struct page *page);
8f1d26d0	83	void free_huge_page(struct page *page);
1da177e4	84
3212b535 SC	85	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	86	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	87	#endif
	88
396faf03	89	extern unsigned long hugepages_treat_as_movable;
1da177e4	90	extern int sysctl_hugetlb_shm_group;
53ba51d2	91	extern struct list_head huge_boot_pages;
1da177e4	92
63551ae0 DG	93	/* arch callbacks */
63551ae0 DG	94
a5516438 AK	95	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	96	unsigned long addr, unsigned long sz);
63551ae0	97	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	98	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	99	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	100	int write);
	101	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	102	pmd_t *pmd, int write);
ceb86879 AK	103	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	104	pud_t *pud, int write);
63551ae0	105	int pmd_huge(pmd_t pmd);
ceb86879	106	int pud_huge(pud_t pmd);
7da4d641	107	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	108	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	109
1da177e4 LT	110	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	111
20a0307c WF	112	static inline int PageHuge(struct page *page)
	113	{
	114	return 0;
	115	}
	116
a1e78772 MG	117	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	118	{
	119	}
	120
1da177e4 LT	121	static inline unsigned long hugetlb_total_pages(void)
	122	{
	123	return 0;
	124	}
	125
5b23dbe8	126	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	127	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	128	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	129	static inline void hugetlb_report_meminfo(struct seq_file *m)
	130	{
	131	}
1da177e4	132	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	133	static inline void hugetlb_show_meminfo(void)
	134	{
	135	}
1da177e4	136	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	137	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	138	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	139	#define pmd_huge(x) 0
ceb86879	140	#define pud_huge(x) 0
1da177e4	141	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	142	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	143	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	144	#define huge_pte_offset(mm, address) 0
24669e58 AK	145	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	146	{
	147	return 0;
	148	}
	149
f40386a4 NH	150	static inline bool isolate_huge_page(struct page page, struct list_head list)
	151	{
	152	return false;
	153	}
31caf665	154	#define putback_active_hugepage(p) do {} while (0)
c8721bbb	155	#define is_hugepage_active(x) false
1da177e4	156
7da4d641 PZ	157	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	158	unsigned long address, unsigned long end, pgprot_t newprot)
	159	{
	160	return 0;
	161	}
8f860591	162
d833352a MG	163	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	164	struct vm_area_struct *vma, unsigned long start,
	165	unsigned long end, struct page *ref_page)
	166	{
	167	BUG();
	168	}
	169
24669e58 AK	170	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	171	struct vm_area_struct *vma, unsigned long start,
	172	unsigned long end, struct page *ref_page)
	173	{
	174	BUG();
	175	}
	176
1da177e4	177	#endif /* !CONFIG_HUGETLB_PAGE */
f30c59e9 AK	178	/*
	179	* hugepages at page global directory. If arch support
	180	* hugepages at pgd level, they need to define this.
	181	*/
	182	#ifndef pgd_huge
	183	#define pgd_huge(x) 0
	184	#endif
	185
	186	#ifndef pgd_write
	187	static inline int pgd_write(pgd_t pgd)
	188	{
	189	BUG();
	190	return 0;
	191	}
	192	#endif
	193
	194	#ifndef pud_write
	195	static inline int pud_write(pud_t pud)
	196	{
	197	BUG();
	198	return 0;
	199	}
	200	#endif
	201
	202	#ifndef is_hugepd
	203	/*
	204	* Some architectures requires a hugepage directory format that is
	205	* required to support multiple hugepage sizes. For example
	206	* a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
	207	* introduced the same on powerpc. This allows for a more flexible hugepage
	208	* pagetable layout.
	209	*/
	210	typedef struct { unsigned long pd; } hugepd_t;
	211	#define is_hugepd(hugepd) (0)
	212	#define __hugepd(x) ((hugepd_t) { (x) })
	213	static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	214	unsigned pdshift, unsigned long end,
	215	int write, struct page *pages, int nr)
	216	{
	217	return 0;
	218	}
	219	#else
	220	extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	221	unsigned pdshift, unsigned long end,
	222	int write, struct page *pages, int nr);
	223	#endif
1da177e4	224
4e52780d EM	225	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	226
6bfde05b EM	227	enum {
	228	/*
	229	* The file will be used as an shm file so shmfs accounting rules
	230	* apply
	231	*/
	232	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	233	/*
	234	* The file is being created on the internal vfs mount and shmfs
	235	* accounting rules do not apply
	236	*/
	237	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	238	};
6bfde05b EM	239
1da177e4	240	#ifdef CONFIG_HUGETLBFS
1da177e4	241	struct hugetlbfs_sb_info {
1da177e4 LT	242	long max_inodes; /* inodes allowed */
	243	long free_inodes; /* inodes free */
	244	spinlock_t stat_lock;
a137e1cc	245	struct hstate *hstate;
90481622	246	struct hugepage_subpool *spool;
1da177e4 LT	247	};
1da177e4 LT	248
1da177e4 LT	249	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	250	{
	251	return sb->s_fs_info;
	252	}
	253
4b6f5d20	254	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	255	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	256	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	257	struct user_struct **user, int creat_flags,
42d7395f AK	258	int page_size_log);
1da177e4 LT	259
	260	static inline int is_file_hugepages(struct file *file)
	261	{
516dffdc AL	262	if (file->f_op == &hugetlbfs_file_operations)
	263	return 1;
	264	if (is_file_shm_hugepages(file))
	265	return 1;
	266
	267	return 0;
1da177e4 LT	268	}
1da177e4 LT	269
42d7395f	270
1da177e4 LT	271	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	272
1db8508c	273	#define is_file_hugepages(file) 0
40716e29	274	static inline struct file *
af73e4d9 NH	275	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	276	struct user_struct **user, int creat_flags,
42d7395f	277	int page_size_log)
e9ea0e2d AM	278	{
	279	return ERR_PTR(-ENOSYS);
	280	}
1da177e4 LT	281
	282	#endif /* !CONFIG_HUGETLBFS */
	283
d2ba27e8 AB	284	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	285	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	286	unsigned long len, unsigned long pgoff,
	287	unsigned long flags);
	288	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	289
a5516438 AK	290	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	291
a3437870	292	#define HSTATE_NAME_LEN 32
a5516438 AK	293	/* Defines one hugetlb page size */
a5516438 AK	294	struct hstate {
e8c5c824 LS	295	int next_nid_to_alloc;
e8c5c824 LS	296	int next_nid_to_free;
a5516438 AK	297	unsigned int order;
	298	unsigned long mask;
	299	unsigned long max_huge_pages;
	300	unsigned long nr_huge_pages;
	301	unsigned long free_huge_pages;
	302	unsigned long resv_huge_pages;
	303	unsigned long surplus_huge_pages;
	304	unsigned long nr_overcommit_huge_pages;
0edaecfa	305	struct list_head hugepage_activelist;
a5516438 AK	306	struct list_head hugepage_freelists[MAX_NUMNODES];
	307	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	308	unsigned int free_huge_pages_node[MAX_NUMNODES];
	309	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	310	#ifdef CONFIG_CGROUP_HUGETLB
	311	/* cgroup control files */
	312	struct cftype cgroup_files[5];
	313	#endif
a3437870	314	char name[HSTATE_NAME_LEN];
a5516438 AK	315	};
a5516438 AK	316
53ba51d2 JT	317	struct huge_bootmem_page {
	318	struct list_head list;
	319	struct hstate *hstate;
ee8f248d BB	320	#ifdef CONFIG_HIGHMEM
	321	phys_addr_t phys;
	322	#endif
53ba51d2 JT	323	};
53ba51d2 JT	324
bf50bab2	325	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	326	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	327	unsigned long addr, int avoid_reserve);
bf50bab2	328
53ba51d2 JT	329	/* arch callback */
	330	int __init alloc_bootmem_huge_page(struct hstate *h);
	331
e5ff2159 AK	332	void __init hugetlb_add_hstate(unsigned order);
	333	struct hstate *size_to_hstate(unsigned long size);
	334
	335	#ifndef HUGE_MAX_HSTATE
	336	#define HUGE_MAX_HSTATE 1
	337	#endif
	338
	339	extern struct hstate hstates[HUGE_MAX_HSTATE];
	340	extern unsigned int default_hstate_idx;
	341
	342	#define default_hstate (hstates[default_hstate_idx])
a5516438	343
a137e1cc	344	static inline struct hstate hstate_inode(struct inode i)
a5516438	345	{
a137e1cc AK	346	struct hugetlbfs_sb_info *hsb;
	347	hsb = HUGETLBFS_SB(i->i_sb);
	348	return hsb->hstate;
a5516438 AK	349	}
	350
	351	static inline struct hstate hstate_file(struct file f)
	352	{
496ad9aa	353	return hstate_inode(file_inode(f));
a5516438 AK	354	}
a5516438 AK	355
af73e4d9 NH	356	static inline struct hstate *hstate_sizelog(int page_size_log)
	357	{
	358	if (!page_size_log)
	359	return &default_hstate;
97ad2be1 SL	360
97ad2be1 SL	361	return size_to_hstate(1UL << page_size_log);
af73e4d9 NH	362	}
af73e4d9 NH	363
a137e1cc	364	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	365	{
a137e1cc	366	return hstate_file(vma->vm_file);
a5516438 AK	367	}
	368
	369	static inline unsigned long huge_page_size(struct hstate *h)
	370	{
	371	return (unsigned long)PAGE_SIZE << h->order;
	372	}
	373
08fba699 MG	374	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	375
3340289d MG	376	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	377
a5516438 AK	378	static inline unsigned long huge_page_mask(struct hstate *h)
	379	{
	380	return h->mask;
	381	}
	382
	383	static inline unsigned int huge_page_order(struct hstate *h)
	384	{
	385	return h->order;
	386	}
	387
	388	static inline unsigned huge_page_shift(struct hstate *h)
	389	{
	390	return h->order + PAGE_SHIFT;
	391	}
	392
bae7f4ae LC	393	static inline bool hstate_is_gigantic(struct hstate *h)
	394	{
	395	return huge_page_order(h) >= MAX_ORDER;
	396	}
	397
a5516438 AK	398	static inline unsigned int pages_per_huge_page(struct hstate *h)
	399	{
	400	return 1 << h->order;
	401	}
	402
	403	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	404	{
	405	return huge_page_size(h) / 512;
	406	}
	407
	408	#include <asm/hugetlb.h>
	409
d9ed9faa CM	410	#ifndef arch_make_huge_pte
	411	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	412	struct page *page, int writable)
	413	{
	414	return entry;
	415	}
	416	#endif
	417
e5ff2159 AK	418	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	419	{
309381fe	420	VM_BUG_ON_PAGE(!PageHuge(page), page);
e5ff2159 AK	421	return size_to_hstate(PAGE_SIZE << compound_order(page));
	422	}
	423
aa50d3a7 AK	424	static inline unsigned hstate_index_to_shift(unsigned index)
	425	{
	426	return hstates[index].order + PAGE_SHIFT;
	427	}
	428
972dc4de AK	429	static inline int hstate_index(struct hstate *h)
	430	{
	431	return h - hstates;
	432	}
	433
13d60f4b ZY	434	pgoff_t __basepage_index(struct page *page);
	435
	436	/* Return page->index in PAGE_SIZE units */
	437	static inline pgoff_t basepage_index(struct page *page)
	438	{
	439	if (!PageCompound(page))
	440	return page->index;
	441
	442	return __basepage_index(page);
	443	}
	444
c8721bbb NH	445	extern void dissolve_free_huge_pages(unsigned long start_pfn,
c8721bbb NH	446	unsigned long end_pfn);
100873d7	447	static inline int hugepage_migration_supported(struct hstate *h)
83467efb	448	{
c177c81e NH	449	#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	450	return huge_page_shift(h) == PMD_SHIFT;
	451	#else
	452	return 0;
	453	#endif
83467efb	454	}
c8721bbb	455
cb900f41 KS	456	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	457	struct mm_struct mm, pte_t pte)
	458	{
	459	if (huge_page_size(h) == PMD_SIZE)
	460	return pmd_lockptr(mm, (pmd_t *) pte);
	461	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	462	return &mm->page_table_lock;
	463	}
	464
457c1b27 NA	465	static inline bool hugepages_supported(void)
	466	{
	467	/*
	468	* Some platform decide whether they support huge pages at boot
	469	* time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
	470	* there is no such support
	471	*/
	472	return HPAGE_SHIFT != 0;
	473	}
	474
af73e4d9	475	#else /* CONFIG_HUGETLB_PAGE */
a5516438	476	struct hstate {};
bf50bab2	477	#define alloc_huge_page_node(h, nid) NULL
74060e4d	478	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	479	#define alloc_bootmem_huge_page(h) NULL
a5516438	480	#define hstate_file(f) NULL
af73e4d9	481	#define hstate_sizelog(s) NULL
a5516438 AK	482	#define hstate_vma(v) NULL
a5516438 AK	483	#define hstate_inode(i) NULL
cb900f41	484	#define page_hstate(page) NULL
a5516438 AK	485	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	486	#define huge_page_mask(h) PAGE_MASK
08fba699	487	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	488	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	489	#define huge_page_order(h) 0
a5516438 AK	490	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	491	static inline unsigned int pages_per_huge_page(struct hstate *h)
	492	{
	493	return 1;
	494	}
aa50d3a7	495	#define hstate_index_to_shift(index) 0
972dc4de	496	#define hstate_index(h) 0
13d60f4b ZY	497
	498	static inline pgoff_t basepage_index(struct page *page)
	499	{
	500	return page->index;
	501	}
c8721bbb	502	#define dissolve_free_huge_pages(s, e) do {} while (0)
100873d7	503	#define hugepage_migration_supported(h) 0
cb900f41 KS	504
	505	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	506	struct mm_struct mm, pte_t pte)
	507	{
	508	return &mm->page_table_lock;
	509	}
af73e4d9	510	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	511
cb900f41 KS	512	static inline spinlock_t huge_pte_lock(struct hstate h,
	513	struct mm_struct mm, pte_t pte)
	514	{
	515	spinlock_t *ptl;
	516
	517	ptl = huge_pte_lockptr(h, mm, pte);
	518	spin_lock(ptl);
	519	return ptl;
	520	}
	521
1da177e4	522	#endif /* _LINUX_HUGETLB_H */