[deliverable/linux.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>
#include <asm/pgtable.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;	/* Maximum huge pages or -1 if no maximum. */
	long used_hpages;	/* Used count against maximum, includes */
				/* both alloced and reserved pages. */
	struct hstate *hstate;
	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
	long rsv_hpages;	/* Pages reserved against global pool to */
				/* sasitfy minimum size. */
};

struct resv_map {
	struct kref refs;
	spinlock_t lock;
	struct list_head regions;
	long adds_in_progress;
	struct list_head region_cache;
	long region_cache_count;
};
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(struct hstate *h, long max_hpages,
						long min_hpages);
void hugepage_put_subpool(struct hugepage_subpool *spool);

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);
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
						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);
void free_huge_page(struct page *page);
void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve);
extern struct mutex *hugetlb_fault_mutex_table;
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
				struct vm_area_struct *vma,
				struct address_space *mapping,
				pgoff_t idx, unsigned long address);

pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);

extern int 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 flags);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int flags);
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 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, flags)	NULL
#define follow_huge_pud(mm, addr, pud, flags)	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)

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 bool is_file_hugepages(struct file *file)
{
	if (file->f_op == &hugetlbfs_file_operations)
		return true;

	return is_file_shm_hugepages(file);
}


#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			false
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(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
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);
int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
			pgoff_t idx);

/* 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;
}

#ifndef hugepages_supported
/*
 * Some platform decide whether they support huge pages at boot
 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 * when there is no such support
 */
#define hugepages_supported() (HPAGE_SHIFT != 0)
#endif

void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);

static inline void hugetlb_count_add(long l, struct mm_struct *mm)
{
	atomic_long_add(l, &mm->hugetlb_usage);
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
	atomic_long_sub(l, &mm->hugetlb_usage);
}
#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page(v, a, r) NULL
#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;
}

static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
{
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
}
#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
	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
	4	#include <linux/mm_types.h>
	5	#include <linux/mmdebug.h>
	6	#include <linux/fs.h>
	7	#include <linux/hugetlb_inline.h>
	8	#include <linux/cgroup.h>
	9	#include <linux/list.h>
	10	#include <linux/kref.h>
	11	#include <asm/pgtable.h>
	12
	13	struct ctl_table;
	14	struct user_struct;
	15	struct mmu_gather;
	16
	17	#ifdef CONFIG_HUGETLB_PAGE
	18
	19	#include <linux/mempolicy.h>
	20	#include <linux/shm.h>
	21	#include <asm/tlbflush.h>
	22
	23	struct hugepage_subpool {
	24	spinlock_t lock;
	25	long count;
	26	long max_hpages; /* Maximum huge pages or -1 if no maximum. */
	27	long used_hpages; /* Used count against maximum, includes */
	28	/* both alloced and reserved pages. */
	29	struct hstate *hstate;
	30	long min_hpages; /* Minimum huge pages or -1 if no minimum. */
	31	long rsv_hpages; /* Pages reserved against global pool to */
	32	/* sasitfy minimum size. */
	33	};
	34
	35	struct resv_map {
	36	struct kref refs;
	37	spinlock_t lock;
	38	struct list_head regions;
	39	long adds_in_progress;
	40	struct list_head region_cache;
	41	long region_cache_count;
	42	};
	43	extern struct resv_map *resv_map_alloc(void);
	44	void resv_map_release(struct kref *ref);
	45
	46	extern spinlock_t hugetlb_lock;
	47	extern int hugetlb_max_hstate __read_mostly;
	48	#define for_each_hstate(h) \
	49	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	50
	51	struct hugepage_subpool hugepage_new_subpool(struct hstate h, long max_hpages,
	52	long min_hpages);
	53	void hugepage_put_subpool(struct hugepage_subpool *spool);
	54
	55	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
	56	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	57	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	58	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
	59
	60	#ifdef CONFIG_NUMA
	61	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	62	void __user , size_t , loff_t *);
	63	#endif
	64
	65	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
	66	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	67	struct page , struct vm_area_struct ,
	68	unsigned long , unsigned long , long, unsigned int);
	69	void unmap_hugepage_range(struct vm_area_struct *,
	70	unsigned long, unsigned long, struct page *);
	71	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	72	struct vm_area_struct *vma,
	73	unsigned long start, unsigned long end,
	74	struct page *ref_page);
	75	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	76	unsigned long start, unsigned long end,
	77	struct page *ref_page);
	78	void hugetlb_report_meminfo(struct seq_file *);
	79	int hugetlb_report_node_meminfo(int, char *);
	80	void hugetlb_show_meminfo(void);
	81	unsigned long hugetlb_total_pages(void);
	82	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
	83	unsigned long address, unsigned int flags);
	84	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
	85	struct vm_area_struct *vma,
	86	vm_flags_t vm_flags);
	87	long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
	88	long freed);
	89	int dequeue_hwpoisoned_huge_page(struct page *page);
	90	bool isolate_huge_page(struct page page, struct list_head list);
	91	void putback_active_hugepage(struct page *page);
	92	void free_huge_page(struct page *page);
	93	void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve);
	94	extern struct mutex *hugetlb_fault_mutex_table;
	95	u32 hugetlb_fault_mutex_hash(struct hstate h, struct mm_struct mm,
	96	struct vm_area_struct *vma,
	97	struct address_space *mapping,
	98	pgoff_t idx, unsigned long address);
	99
	100	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	101
	102	extern int hugepages_treat_as_movable;
	103	extern int sysctl_hugetlb_shm_group;
	104	extern struct list_head huge_boot_pages;
	105
	106	/* arch callbacks */
	107
	108	pte_t huge_pte_alloc(struct mm_struct mm,
	109	unsigned long addr, unsigned long sz);
	110	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
	111	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
	112	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	113	int write);
	114	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	115	pmd_t *pmd, int flags);
	116	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
	117	pud_t *pud, int flags);
	118	int pmd_huge(pmd_t pmd);
	119	int pud_huge(pud_t pmd);
	120	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	121	unsigned long address, unsigned long end, pgprot_t newprot);
	122
	123	#else /* !CONFIG_HUGETLB_PAGE */
	124
	125	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	126	{
	127	}
	128
	129	static inline unsigned long hugetlb_total_pages(void)
	130	{
	131	return 0;
	132	}
	133
	134	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
	135	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	136	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	137	static inline void hugetlb_report_meminfo(struct seq_file *m)
	138	{
	139	}
	140	#define hugetlb_report_node_meminfo(n, buf) 0
	141	static inline void hugetlb_show_meminfo(void)
	142	{
	143	}
	144	#define follow_huge_pmd(mm, addr, pmd, flags) NULL
	145	#define follow_huge_pud(mm, addr, pud, flags) NULL
	146	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
	147	#define pmd_huge(x) 0
	148	#define pud_huge(x) 0
	149	#define is_hugepage_only_range(mm, addr, len) 0
	150	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
	151	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
	152	#define huge_pte_offset(mm, address) 0
	153	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	154	{
	155	return 0;
	156	}
	157
	158	static inline bool isolate_huge_page(struct page page, struct list_head list)
	159	{
	160	return false;
	161	}
	162	#define putback_active_hugepage(p) do {} while (0)
	163
	164	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	165	unsigned long address, unsigned long end, pgprot_t newprot)
	166	{
	167	return 0;
	168	}
	169
	170	static inline void __unmap_hugepage_range_final(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
	177	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	178	struct vm_area_struct *vma, unsigned long start,
	179	unsigned long end, struct page *ref_page)
	180	{
	181	BUG();
	182	}
	183
	184	#endif /* !CONFIG_HUGETLB_PAGE */
	185	/*
	186	* hugepages at page global directory. If arch support
	187	* hugepages at pgd level, they need to define this.
	188	*/
	189	#ifndef pgd_huge
	190	#define pgd_huge(x) 0
	191	#endif
	192
	193	#ifndef pgd_write
	194	static inline int pgd_write(pgd_t pgd)
	195	{
	196	BUG();
	197	return 0;
	198	}
	199	#endif
	200
	201	#ifndef pud_write
	202	static inline int pud_write(pud_t pud)
	203	{
	204	BUG();
	205	return 0;
	206	}
	207	#endif
	208
	209	#ifndef is_hugepd
	210	/*
	211	* Some architectures requires a hugepage directory format that is
	212	* required to support multiple hugepage sizes. For example
	213	* a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
	214	* introduced the same on powerpc. This allows for a more flexible hugepage
	215	* pagetable layout.
	216	*/
	217	typedef struct { unsigned long pd; } hugepd_t;
	218	#define is_hugepd(hugepd) (0)
	219	#define __hugepd(x) ((hugepd_t) { (x) })
	220	static inline 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	{
	224	return 0;
	225	}
	226	#else
	227	extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	228	unsigned pdshift, unsigned long end,
	229	int write, struct page *pages, int nr);
	230	#endif
	231
	232	#define HUGETLB_ANON_FILE "anon_hugepage"
	233
	234	enum {
	235	/*
	236	* The file will be used as an shm file so shmfs accounting rules
	237	* apply
	238	*/
	239	HUGETLB_SHMFS_INODE = 1,
	240	/*
	241	* The file is being created on the internal vfs mount and shmfs
	242	* accounting rules do not apply
	243	*/
	244	HUGETLB_ANONHUGE_INODE = 2,
	245	};
	246
	247	#ifdef CONFIG_HUGETLBFS
	248	struct hugetlbfs_sb_info {
	249	long max_inodes; /* inodes allowed */
	250	long free_inodes; /* inodes free */
	251	spinlock_t stat_lock;
	252	struct hstate *hstate;
	253	struct hugepage_subpool *spool;
	254	};
	255
	256	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	257	{
	258	return sb->s_fs_info;
	259	}
	260
	261	extern const struct file_operations hugetlbfs_file_operations;
	262	extern const struct vm_operations_struct hugetlb_vm_ops;
	263	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
	264	struct user_struct **user, int creat_flags,
	265	int page_size_log);
	266
	267	static inline bool is_file_hugepages(struct file *file)
	268	{
	269	if (file->f_op == &hugetlbfs_file_operations)
	270	return true;
	271
	272	return is_file_shm_hugepages(file);
	273	}
	274
	275
	276	#else /* !CONFIG_HUGETLBFS */
	277
	278	#define is_file_hugepages(file) false
	279	static inline struct file *
	280	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
	281	struct user_struct **user, int creat_flags,
	282	int page_size_log)
	283	{
	284	return ERR_PTR(-ENOSYS);
	285	}
	286
	287	#endif /* !CONFIG_HUGETLBFS */
	288
	289	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	290	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	291	unsigned long len, unsigned long pgoff,
	292	unsigned long flags);
	293	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	294
	295	#ifdef CONFIG_HUGETLB_PAGE
	296
	297	#define HSTATE_NAME_LEN 32
	298	/* Defines one hugetlb page size */
	299	struct hstate {
	300	int next_nid_to_alloc;
	301	int next_nid_to_free;
	302	unsigned int order;
	303	unsigned long mask;
	304	unsigned long max_huge_pages;
	305	unsigned long nr_huge_pages;
	306	unsigned long free_huge_pages;
	307	unsigned long resv_huge_pages;
	308	unsigned long surplus_huge_pages;
	309	unsigned long nr_overcommit_huge_pages;
	310	struct list_head hugepage_activelist;
	311	struct list_head hugepage_freelists[MAX_NUMNODES];
	312	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	313	unsigned int free_huge_pages_node[MAX_NUMNODES];
	314	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
	315	#ifdef CONFIG_CGROUP_HUGETLB
	316	/* cgroup control files */
	317	struct cftype cgroup_files[5];
	318	#endif
	319	char name[HSTATE_NAME_LEN];
	320	};
	321
	322	struct huge_bootmem_page {
	323	struct list_head list;
	324	struct hstate *hstate;
	325	#ifdef CONFIG_HIGHMEM
	326	phys_addr_t phys;
	327	#endif
	328	};
	329
	330	struct page alloc_huge_page(struct vm_area_struct vma,
	331	unsigned long addr, int avoid_reserve);
	332	struct page alloc_huge_page_node(struct hstate h, int nid);
	333	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
	334	unsigned long addr, int avoid_reserve);
	335	int huge_add_to_page_cache(struct page page, struct address_space mapping,
	336	pgoff_t idx);
	337
	338	/* arch callback */
	339	int __init alloc_bootmem_huge_page(struct hstate *h);
	340
	341	void __init hugetlb_add_hstate(unsigned order);
	342	struct hstate *size_to_hstate(unsigned long size);
	343
	344	#ifndef HUGE_MAX_HSTATE
	345	#define HUGE_MAX_HSTATE 1
	346	#endif
	347
	348	extern struct hstate hstates[HUGE_MAX_HSTATE];
	349	extern unsigned int default_hstate_idx;
	350
	351	#define default_hstate (hstates[default_hstate_idx])
	352
	353	static inline struct hstate hstate_inode(struct inode i)
	354	{
	355	struct hugetlbfs_sb_info *hsb;
	356	hsb = HUGETLBFS_SB(i->i_sb);
	357	return hsb->hstate;
	358	}
	359
	360	static inline struct hstate hstate_file(struct file f)
	361	{
	362	return hstate_inode(file_inode(f));
	363	}
	364
	365	static inline struct hstate *hstate_sizelog(int page_size_log)
	366	{
	367	if (!page_size_log)
	368	return &default_hstate;
	369
	370	return size_to_hstate(1UL << page_size_log);
	371	}
	372
	373	static inline struct hstate hstate_vma(struct vm_area_struct vma)
	374	{
	375	return hstate_file(vma->vm_file);
	376	}
	377
	378	static inline unsigned long huge_page_size(struct hstate *h)
	379	{
	380	return (unsigned long)PAGE_SIZE << h->order;
	381	}
	382
	383	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
	384
	385	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
	386
	387	static inline unsigned long huge_page_mask(struct hstate *h)
	388	{
	389	return h->mask;
	390	}
	391
	392	static inline unsigned int huge_page_order(struct hstate *h)
	393	{
	394	return h->order;
	395	}
	396
	397	static inline unsigned huge_page_shift(struct hstate *h)
	398	{
	399	return h->order + PAGE_SHIFT;
	400	}
	401
	402	static inline bool hstate_is_gigantic(struct hstate *h)
	403	{
	404	return huge_page_order(h) >= MAX_ORDER;
	405	}
	406
	407	static inline unsigned int pages_per_huge_page(struct hstate *h)
	408	{
	409	return 1 << h->order;
	410	}
	411
	412	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	413	{
	414	return huge_page_size(h) / 512;
	415	}
	416
	417	#include <asm/hugetlb.h>
	418
	419	#ifndef arch_make_huge_pte
	420	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	421	struct page *page, int writable)
	422	{
	423	return entry;
	424	}
	425	#endif
	426
	427	static inline struct hstate page_hstate(struct page page)
	428	{
	429	VM_BUG_ON_PAGE(!PageHuge(page), page);
	430	return size_to_hstate(PAGE_SIZE << compound_order(page));
	431	}
	432
	433	static inline unsigned hstate_index_to_shift(unsigned index)
	434	{
	435	return hstates[index].order + PAGE_SHIFT;
	436	}
	437
	438	static inline int hstate_index(struct hstate *h)
	439	{
	440	return h - hstates;
	441	}
	442
	443	pgoff_t __basepage_index(struct page *page);
	444
	445	/* Return page->index in PAGE_SIZE units */
	446	static inline pgoff_t basepage_index(struct page *page)
	447	{
	448	if (!PageCompound(page))
	449	return page->index;
	450
	451	return __basepage_index(page);
	452	}
	453
	454	extern void dissolve_free_huge_pages(unsigned long start_pfn,
	455	unsigned long end_pfn);
	456	static inline int hugepage_migration_supported(struct hstate *h)
	457	{
	458	#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	459	return huge_page_shift(h) == PMD_SHIFT;
	460	#else
	461	return 0;
	462	#endif
	463	}
	464
	465	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	466	struct mm_struct mm, pte_t pte)
	467	{
	468	if (huge_page_size(h) == PMD_SIZE)
	469	return pmd_lockptr(mm, (pmd_t *) pte);
	470	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	471	return &mm->page_table_lock;
	472	}
	473
	474	#ifndef hugepages_supported
	475	/*
	476	* Some platform decide whether they support huge pages at boot
	477	* time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
	478	* when there is no such support
	479	*/
	480	#define hugepages_supported() (HPAGE_SHIFT != 0)
	481	#endif
	482
	483	void hugetlb_report_usage(struct seq_file m, struct mm_struct mm);
	484
	485	static inline void hugetlb_count_add(long l, struct mm_struct *mm)
	486	{
	487	atomic_long_add(l, &mm->hugetlb_usage);
	488	}
	489
	490	static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
	491	{
	492	atomic_long_sub(l, &mm->hugetlb_usage);
	493	}
	494	#else /* CONFIG_HUGETLB_PAGE */
	495	struct hstate {};
	496	#define alloc_huge_page(v, a, r) NULL
	497	#define alloc_huge_page_node(h, nid) NULL
	498	#define alloc_huge_page_noerr(v, a, r) NULL
	499	#define alloc_bootmem_huge_page(h) NULL
	500	#define hstate_file(f) NULL
	501	#define hstate_sizelog(s) NULL
	502	#define hstate_vma(v) NULL
	503	#define hstate_inode(i) NULL
	504	#define page_hstate(page) NULL
	505	#define huge_page_size(h) PAGE_SIZE
	506	#define huge_page_mask(h) PAGE_MASK
	507	#define vma_kernel_pagesize(v) PAGE_SIZE
	508	#define vma_mmu_pagesize(v) PAGE_SIZE
	509	#define huge_page_order(h) 0
	510	#define huge_page_shift(h) PAGE_SHIFT
	511	static inline unsigned int pages_per_huge_page(struct hstate *h)
	512	{
	513	return 1;
	514	}
	515	#define hstate_index_to_shift(index) 0
	516	#define hstate_index(h) 0
	517
	518	static inline pgoff_t basepage_index(struct page *page)
	519	{
	520	return page->index;
	521	}
	522	#define dissolve_free_huge_pages(s, e) do {} while (0)
	523	#define hugepage_migration_supported(h) 0
	524
	525	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	526	struct mm_struct mm, pte_t pte)
	527	{
	528	return &mm->page_table_lock;
	529	}
	530
	531	static inline void hugetlb_report_usage(struct seq_file f, struct mm_struct m)
	532	{
	533	}
	534
	535	static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
	536	{
	537	}
	538	#endif /* CONFIG_HUGETLB_PAGE */
	539
	540	static inline spinlock_t huge_pte_lock(struct hstate h,
	541	struct mm_struct mm, pte_t pte)
	542	{
	543	spinlock_t *ptl;
	544
	545	ptl = huge_pte_lockptr(h, mm, pte);
	546	spin_lock(ptl);
	547	return ptl;
	548	}
	549
	550	#endif /* _LINUX_HUGETLB_H */