[mirror_ubuntu-artful-kernel.git] / include / linux / huge_mm.h

#ifndef _LINUX_HUGE_MM_H
#define _LINUX_HUGE_MM_H

extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
			 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
			 struct vm_area_struct *vma);
extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
			 pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
			 struct vm_area_struct *vma);

#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
#else
static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
{
}
#endif

extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
					  unsigned long addr,
					  pmd_t *pmd,
					  unsigned int flags);
extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pmd_t *pmd, unsigned long addr, unsigned long next);
extern int zap_huge_pmd(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pmd_t *pmd, unsigned long addr);
extern int zap_huge_pud(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pud_t *pud, unsigned long addr);
extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
			unsigned long addr, unsigned long end,
			unsigned char *vec);
extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
			 unsigned long new_addr, unsigned long old_end,
			 pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
			unsigned long addr, pgprot_t newprot,
			int prot_numa);
int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
			pmd_t *pmd, pfn_t pfn, bool write);
int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
			pud_t *pud, pfn_t pfn, bool write);
enum transparent_hugepage_flag {
	TRANSPARENT_HUGEPAGE_FLAG,
	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
#ifdef CONFIG_DEBUG_VM
	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
#endif
};

struct kobject;
struct kobj_attribute;

extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
				 struct kobj_attribute *attr,
				 const char *buf, size_t count,
				 enum transparent_hugepage_flag flag);
extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
				struct kobj_attribute *attr, char *buf,
				enum transparent_hugepage_flag flag);
extern struct kobj_attribute shmem_enabled_attr;

#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define HPAGE_PMD_SHIFT PMD_SHIFT
#define HPAGE_PMD_SIZE	((1UL) << HPAGE_PMD_SHIFT)
#define HPAGE_PMD_MASK	(~(HPAGE_PMD_SIZE - 1))

#define HPAGE_PUD_SHIFT PUD_SHIFT
#define HPAGE_PUD_SIZE	((1UL) << HPAGE_PUD_SHIFT)
#define HPAGE_PUD_MASK	(~(HPAGE_PUD_SIZE - 1))

extern bool is_vma_temporary_stack(struct vm_area_struct *vma);

#define transparent_hugepage_enabled(__vma)				\
	((transparent_hugepage_flags &					\
	  (1<<TRANSPARENT_HUGEPAGE_FLAG) ||				\
	  (transparent_hugepage_flags &					\
	   (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&			\
	   ((__vma)->vm_flags & VM_HUGEPAGE))) &&			\
	 !((__vma)->vm_flags & VM_NOHUGEPAGE) &&			\
	 !is_vma_temporary_stack(__vma))
#define transparent_hugepage_use_zero_page()				\
	(transparent_hugepage_flags &					\
	 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
#ifdef CONFIG_DEBUG_VM
#define transparent_hugepage_debug_cow()				\
	(transparent_hugepage_flags &					\
	 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
#else /* CONFIG_DEBUG_VM */
#define transparent_hugepage_debug_cow() 0
#endif /* CONFIG_DEBUG_VM */

extern unsigned long transparent_hugepage_flags;

extern unsigned long thp_get_unmapped_area(struct file *filp,
		unsigned long addr, unsigned long len, unsigned long pgoff,
		unsigned long flags);

extern void prep_transhuge_page(struct page *page);
extern void free_transhuge_page(struct page *page);

int split_huge_page_to_list(struct page *page, struct list_head *list);
static inline int split_huge_page(struct page *page)
{
	return split_huge_page_to_list(page, NULL);
}
void deferred_split_huge_page(struct page *page);

void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
		unsigned long address, bool freeze, struct page *page);

#define split_huge_pmd(__vma, __pmd, __address)				\
	do {								\
		pmd_t *____pmd = (__pmd);				\
		if (pmd_trans_huge(*____pmd)				\
					|| pmd_devmap(*____pmd))	\
			__split_huge_pmd(__vma, __pmd, __address,	\
						false, NULL);		\
	}  while (0)


void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
		bool freeze, struct page *page);

void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
		unsigned long address);

#define split_huge_pud(__vma, __pud, __address)				\
	do {								\
		pud_t *____pud = (__pud);				\
		if (pud_trans_huge(*____pud)				\
					|| pud_devmap(*____pud))	\
			__split_huge_pud(__vma, __pud, __address);	\
	}  while (0)

extern int hugepage_madvise(struct vm_area_struct *vma,
			    unsigned long *vm_flags, int advice);
extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
				    unsigned long start,
				    unsigned long end,
				    long adjust_next);
extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma);
extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
		struct vm_area_struct *vma);
/* mmap_sem must be held on entry */
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
		return __pmd_trans_huge_lock(pmd, vma);
	else
		return NULL;
}
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
		struct vm_area_struct *vma)
{
	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	if (pud_trans_huge(*pud) || pud_devmap(*pud))
		return __pud_trans_huge_lock(pud, vma);
	else
		return NULL;
}
static inline int hpage_nr_pages(struct page *page)
{
	if (unlikely(PageTransHuge(page)))
		return HPAGE_PMD_NR;
	return 1;
}

struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
		pmd_t *pmd, int flags);
struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
		pud_t *pud, int flags);

extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);

extern struct page *huge_zero_page;

static inline bool is_huge_zero_page(struct page *page)
{
	return ACCESS_ONCE(huge_zero_page) == page;
}

static inline bool is_huge_zero_pmd(pmd_t pmd)
{
	return is_huge_zero_page(pmd_page(pmd));
}

static inline bool is_huge_zero_pud(pud_t pud)
{
	return false;
}

struct page *mm_get_huge_zero_page(struct mm_struct *mm);
void mm_put_huge_zero_page(struct mm_struct *mm);

#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))

#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })

#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })

#define hpage_nr_pages(x) 1

#define transparent_hugepage_enabled(__vma) 0

static inline void prep_transhuge_page(struct page *page) {}

#define transparent_hugepage_flags 0UL

#define thp_get_unmapped_area	NULL

static inline int
split_huge_page_to_list(struct page *page, struct list_head *list)
{
	return 0;
}
static inline int split_huge_page(struct page *page)
{
	return 0;
}
static inline void deferred_split_huge_page(struct page *page) {}
#define split_huge_pmd(__vma, __pmd, __address)	\
	do { } while (0)

static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
		unsigned long address, bool freeze, struct page *page) {}
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
		unsigned long address, bool freeze, struct page *page) {}

#define split_huge_pud(__vma, __pmd, __address)	\
	do { } while (0)

static inline int hugepage_madvise(struct vm_area_struct *vma,
				   unsigned long *vm_flags, int advice)
{
	BUG();
	return 0;
}
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
					 unsigned long start,
					 unsigned long end,
					 long adjust_next)
{
}
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	return NULL;
}
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
		struct vm_area_struct *vma)
{
	return NULL;
}

static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
{
	return 0;
}

static inline bool is_huge_zero_page(struct page *page)
{
	return false;
}

static inline bool is_huge_zero_pud(pud_t pud)
{
	return false;
}

static inline void mm_put_huge_zero_page(struct mm_struct *mm)
{
	return;
}

static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
		unsigned long addr, pmd_t *pmd, int flags)
{
	return NULL;
}

static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
		unsigned long addr, pud_t *pud, int flags)
{
	return NULL;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_HUGE_MM_H */
Commit	Line	Data
71e3aac0 AA	1	#ifndef _LINUX_HUGE_MM_H
	2	#define _LINUX_HUGE_MM_H
	3
82b0f8c3	4	extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
71e3aac0 AA	5	extern int copy_huge_pmd(struct mm_struct dst_mm, struct mm_struct src_mm,
	6	pmd_t dst_pmd, pmd_t src_pmd, unsigned long addr,
	7	struct vm_area_struct *vma);
82b0f8c3	8	extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
a00cc7d9 MW	9	extern int copy_huge_pud(struct mm_struct dst_mm, struct mm_struct src_mm,
	10	pud_t dst_pud, pud_t src_pud, unsigned long addr,
	11	struct vm_area_struct *vma);
	12
	13	#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
	14	extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
	15	#else
	16	static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
	17	{
	18	}
	19	#endif
	20
82b0f8c3	21	extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
b676b293	22	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	23	unsigned long addr,
	24	pmd_t *pmd,
	25	unsigned int flags);
319904ad	26	extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
b8d3c4c3 MK	27	struct vm_area_struct *vma,
b8d3c4c3 MK	28	pmd_t *pmd, unsigned long addr, unsigned long next);
71e3aac0 AA	29	extern int zap_huge_pmd(struct mmu_gather *tlb,
71e3aac0 AA	30	struct vm_area_struct *vma,
f21760b1	31	pmd_t *pmd, unsigned long addr);
a00cc7d9 MW	32	extern int zap_huge_pud(struct mmu_gather *tlb,
	33	struct vm_area_struct *vma,
	34	pud_t *pud, unsigned long addr);
0ca1634d JW	35	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	36	unsigned long addr, unsigned long end,
	37	unsigned char *vec);
bf8616d5	38	extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
37a1c49a	39	unsigned long new_addr, unsigned long old_end,
5d190420	40	pmd_t old_pmd, pmd_t new_pmd, bool *need_flush);
cd7548ab	41	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5 MG	42	unsigned long addr, pgprot_t newprot,
4b10e7d5 MG	43	int prot_numa);
a00cc7d9 MW	44	int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
	45	pmd_t *pmd, pfn_t pfn, bool write);
	46	int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
	47	pud_t *pud, pfn_t pfn, bool write);
71e3aac0 AA	48	enum transparent_hugepage_flag {
	49	TRANSPARENT_HUGEPAGE_FLAG,
	50	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	51	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	52	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	53	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	54	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	55	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	56	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	57	#ifdef CONFIG_DEBUG_VM
	58	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	59	#endif
	60	};
	61
b46e756f KS	62	struct kobject;
	63	struct kobj_attribute;
	64
	65	extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
	66	struct kobj_attribute *attr,
	67	const char *buf, size_t count,
	68	enum transparent_hugepage_flag flag);
	69	extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
	70	struct kobj_attribute attr, char buf,
	71	enum transparent_hugepage_flag flag);
5a6e75f8 KS	72	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	73
d8c37c48 NH	74	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	75	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	76
71e3aac0	77	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	78	#define HPAGE_PMD_SHIFT PMD_SHIFT
	79	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	80	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	81
a00cc7d9 MW	82	#define HPAGE_PUD_SHIFT PUD_SHIFT
	83	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	84	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	85
20995974 AS	86	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	87
71e3aac0	88	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	89	((transparent_hugepage_flags & \
	90	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	91	(transparent_hugepage_flags & \
	92	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	93	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	94	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	95	!is_vma_temporary_stack(__vma))
79da5407 KS	96	#define transparent_hugepage_use_zero_page() \
	97	(transparent_hugepage_flags & \
	98	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	99	#ifdef CONFIG_DEBUG_VM
	100	#define transparent_hugepage_debug_cow() \
	101	(transparent_hugepage_flags & \
	102	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	103	#else /* CONFIG_DEBUG_VM */
	104	#define transparent_hugepage_debug_cow() 0
	105	#endif /* CONFIG_DEBUG_VM */
	106
	107	extern unsigned long transparent_hugepage_flags;
ad0bed24	108
74d2fad1 TK	109	extern unsigned long thp_get_unmapped_area(struct file *filp,
	110	unsigned long addr, unsigned long len, unsigned long pgoff,
	111	unsigned long flags);
	112
9a982250 KS	113	extern void prep_transhuge_page(struct page *page);
	114	extern void free_transhuge_page(struct page *page);
	115
e9b61f19 KS	116	int split_huge_page_to_list(struct page page, struct list_head list);
	117	static inline int split_huge_page(struct page *page)
	118	{
	119	return split_huge_page_to_list(page, NULL);
	120	}
9a982250	121	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	122
eef1b3ba KS	123	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	124	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	125
	126	#define split_huge_pmd(__vma, __pmd, __address) \
	127	do { \
	128	pmd_t *____pmd = (__pmd); \
5c7fb56e DW	129	if (pmd_trans_huge(*____pmd) \
5c7fb56e DW	130	\|\| pmd_devmap(*____pmd)) \
fec89c10	131	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	132	false, NULL); \
eef1b3ba	133	} while (0)
ad0bed24	134
2a52bcbc	135
fec89c10 KS	136	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	137	bool freeze, struct page *page);
2a52bcbc	138
a00cc7d9 MW	139	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	140	unsigned long address);
	141
	142	#define split_huge_pud(__vma, __pud, __address) \
	143	do { \
	144	pud_t *____pud = (__pud); \
	145	if (pud_trans_huge(*____pud) \
	146	\|\| pud_devmap(*____pud)) \
	147	__split_huge_pud(__vma, __pud, __address); \
	148	} while (0)
	149
60ab3244 AA	150	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	151	unsigned long *vm_flags, int advice);
e1b9996b	152	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	153	unsigned long start,
	154	unsigned long end,
	155	long adjust_next);
b6ec57f4 KS	156	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	157	struct vm_area_struct *vma);
a00cc7d9 MW	158	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	159	struct vm_area_struct *vma);
025c5b24	160	/* mmap_sem must be held on entry */
b6ec57f4 KS	161	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	162	struct vm_area_struct *vma)
025c5b24	163	{
81d1b09c	164	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
5c7fb56e	165	if (pmd_trans_huge(pmd) \|\| pmd_devmap(pmd))
b6ec57f4	166	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	167	else
969e8d7e	168	return NULL;
025c5b24	169	}
a00cc7d9 MW	170	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	171	struct vm_area_struct *vma)
	172	{
	173	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	174	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	175	return __pud_trans_huge_lock(pud, vma);
	176	else
	177	return NULL;
	178	}
2c888cfb RR	179	static inline int hpage_nr_pages(struct page *page)
	180	{
	181	if (unlikely(PageTransHuge(page)))
	182	return HPAGE_PMD_NR;
	183	return 1;
	184	}
d10e63f2	185
a00cc7d9 MW	186	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
	187	pmd_t *pmd, int flags);
	188	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
	189	pud_t *pud, int flags);
	190
82b0f8c3	191	extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	192
56873f43 WY	193	extern struct page *huge_zero_page;
	194
	195	static inline bool is_huge_zero_page(struct page *page)
	196	{
	197	return ACCESS_ONCE(huge_zero_page) == page;
	198	}
	199
fc437044 MW	200	static inline bool is_huge_zero_pmd(pmd_t pmd)
	201	{
	202	return is_huge_zero_page(pmd_page(pmd));
	203	}
	204
a00cc7d9 MW	205	static inline bool is_huge_zero_pud(pud_t pud)
	206	{
	207	return false;
	208	}
	209
6fcb52a5 AL	210	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	211	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	212
10102459 KS	213	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	214
71e3aac0	215	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	216	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	217	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	218	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	219
a00cc7d9 MW	220	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	221	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	222	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	223
2c888cfb RR	224	#define hpage_nr_pages(x) 1
2c888cfb RR	225
71e3aac0 AA	226	#define transparent_hugepage_enabled(__vma) 0
71e3aac0 AA	227
800d8c63 KS	228	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	229
71e3aac0	230	#define transparent_hugepage_flags 0UL
74d2fad1 TK	231
	232	#define thp_get_unmapped_area NULL
	233
5bc7b8ac SL	234	static inline int
	235	split_huge_page_to_list(struct page page, struct list_head list)
	236	{
	237	return 0;
	238	}
71e3aac0 AA	239	static inline int split_huge_page(struct page *page)
	240	{
	241	return 0;
	242	}
9a982250	243	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	244	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	245	do { } while (0)
2a52bcbc	246
fd60775a DR	247	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	248	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	249	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	250	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	251
a00cc7d9 MW	252	#define split_huge_pud(__vma, __pmd, __address) \
	253	do { } while (0)
	254
60ab3244 AA	255	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	256	unsigned long *vm_flags, int advice)
0af4e98b AA	257	{
	258	BUG();
	259	return 0;
	260	}
94fcc585 AA	261	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	262	unsigned long start,
	263	unsigned long end,
	264	long adjust_next)
	265	{
	266	}
b6ec57f4 KS	267	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	268	struct vm_area_struct *vma)
025c5b24	269	{
b6ec57f4	270	return NULL;
025c5b24	271	}
a00cc7d9 MW	272	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	273	struct vm_area_struct *vma)
	274	{
	275	return NULL;
	276	}
d10e63f2	277
82b0f8c3	278	static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
d10e63f2	279	{
4daae3b4	280	return 0;
d10e63f2 MG	281	}
d10e63f2 MG	282
56873f43 WY	283	static inline bool is_huge_zero_page(struct page *page)
	284	{
	285	return false;
	286	}
	287
a00cc7d9 MW	288	static inline bool is_huge_zero_pud(pud_t pud)
	289	{
	290	return false;
	291	}
	292
6fcb52a5	293	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	294	{
6fcb52a5	295	return;
aa88b68c	296	}
3565fce3 DW	297
	298	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
	299	unsigned long addr, pmd_t *pmd, int flags)
	300	{
	301	return NULL;
	302	}
a00cc7d9 MW	303
	304	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
	305	unsigned long addr, pud_t *pud, int flags)
	306	{
	307	return NULL;
	308	}
71e3aac0 AA	309	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	310
	311	#endif /* _LINUX_HUGE_MM_H */