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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_HUGE_MM_H
#define _LINUX_HUGE_MM_H

#include <linux/sched/coredump.h>
#include <linux/mm_types.h>

#include <linux/fs.h> /* only for vma_is_dax() */

extern vm_fault_t 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 vm_fault_t 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);
extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
			unsigned long addr, pgprot_t newprot,
			int prot_numa);
vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, 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);

extern unsigned long transparent_hugepage_flags;

/*
 * to be used on vmas which are known to support THP.
 * Use transparent_hugepage_enabled otherwise
 */
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
{
	if (vma->vm_flags & VM_NOHUGEPAGE)
		return false;

	if (is_vma_temporary_stack(vma))
		return false;

	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
		return false;

	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
		return true;

	if (vma_is_dax(vma))
		return true;

	if (transparent_hugepage_flags &
				(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
		return !!(vma->vm_flags & VM_HUGEPAGE);

	return false;
}

bool transparent_hugepage_enabled(struct vm_area_struct *vma);

#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)

static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
		unsigned long haddr)
{
	/* Don't have to check pgoff for anonymous vma */
	if (!vma_is_anonymous(vma)) {
		if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
			(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
			return false;
	}

	if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
		return false;
	return true;
}

#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 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);

bool can_split_huge_page(struct page *page, int *pextra_pins);
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 (is_swap_pmd(*____pmd) || 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);

static inline int is_swap_pmd(pmd_t pmd)
{
	return !pmd_none(pmd) && !pmd_present(pmd);
}

/* 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 (is_swap_pmd(*pmd) || 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 dev_pagemap **pgmap);
struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
		pud_t *pud, int flags, struct dev_pagemap **pgmap);

extern vm_fault_t 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 READ_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))

static inline bool thp_migration_supported(void)
{
	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
}

static inline struct list_head *page_deferred_list(struct page *page)
{
	/*
	 * Global or memcg deferred list in the second tail pages is
	 * occupied by compound_head.
	 */
	return &page[2].deferred_list;
}

#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

static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
{
	return false;
}

static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
{
	return false;
}

static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
		unsigned long haddr)
{
	return false;
}

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

#define transparent_hugepage_flags 0UL

#define thp_get_unmapped_area	NULL

static inline bool
can_split_huge_page(struct page *page, int *pextra_pins)
{
	BUILD_BUG();
	return false;
}
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 int is_swap_pmd(pmd_t pmd)
{
	return 0;
}
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 vm_fault_t 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, struct dev_pagemap **pgmap)
{
	return NULL;
}

static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
	unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
{
	return NULL;
}

static inline bool thp_migration_supported(void)
{
	return false;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_HUGE_MM_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
71e3aac0 AA	2	#ifndef _LINUX_HUGE_MM_H
	3	#define _LINUX_HUGE_MM_H
	4
16981d76	5	#include <linux/sched/coredump.h>
226ab561	6	#include <linux/mm_types.h>
16981d76	7
baabda26 DW	8	#include <linux/fs.h> /* only for vma_is_dax() */
baabda26 DW	9
2b740303	10	extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
71e3aac0 AA	11	extern int copy_huge_pmd(struct mm_struct dst_mm, struct mm_struct src_mm,
	12	pmd_t dst_pmd, pmd_t src_pmd, unsigned long addr,
	13	struct vm_area_struct *vma);
82b0f8c3	14	extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
a00cc7d9 MW	15	extern int copy_huge_pud(struct mm_struct dst_mm, struct mm_struct src_mm,
	16	pud_t dst_pud, pud_t src_pud, unsigned long addr,
	17	struct vm_area_struct *vma);
	18
	19	#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
	20	extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
	21	#else
	22	static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
	23	{
	24	}
	25	#endif
	26
2b740303	27	extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
b676b293	28	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	29	unsigned long addr,
	30	pmd_t *pmd,
	31	unsigned int flags);
319904ad	32	extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
b8d3c4c3 MK	33	struct vm_area_struct *vma,
b8d3c4c3 MK	34	pmd_t *pmd, unsigned long addr, unsigned long next);
71e3aac0 AA	35	extern int zap_huge_pmd(struct mmu_gather *tlb,
71e3aac0 AA	36	struct vm_area_struct *vma,
f21760b1	37	pmd_t *pmd, unsigned long addr);
a00cc7d9 MW	38	extern int zap_huge_pud(struct mmu_gather *tlb,
	39	struct vm_area_struct *vma,
	40	pud_t *pud, unsigned long addr);
0ca1634d JW	41	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	42	unsigned long addr, unsigned long end,
	43	unsigned char *vec);
bf8616d5	44	extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
37a1c49a	45	unsigned long new_addr, unsigned long old_end,
eb66ae03	46	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab	47	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5 MG	48	unsigned long addr, pgprot_t newprot,
4b10e7d5 MG	49	int prot_numa);
fce86ff5 DW	50	vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
fce86ff5 DW	51	vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
71e3aac0 AA	52	enum transparent_hugepage_flag {
	53	TRANSPARENT_HUGEPAGE_FLAG,
	54	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	55	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	56	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	57	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	58	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	59	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	60	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	61	#ifdef CONFIG_DEBUG_VM
	62	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	63	#endif
	64	};
	65
b46e756f KS	66	struct kobject;
	67	struct kobj_attribute;
	68
	69	extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
	70	struct kobj_attribute *attr,
	71	const char *buf, size_t count,
	72	enum transparent_hugepage_flag flag);
	73	extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
	74	struct kobj_attribute attr, char buf,
	75	enum transparent_hugepage_flag flag);
5a6e75f8 KS	76	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	77
d8c37c48 NH	78	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	79	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	80
71e3aac0	81	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	82	#define HPAGE_PMD_SHIFT PMD_SHIFT
	83	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	84	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	85
a00cc7d9 MW	86	#define HPAGE_PUD_SHIFT PUD_SHIFT
	87	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	88	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	89
20995974 AS	90	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	91
16981d76 DW	92	extern unsigned long transparent_hugepage_flags;
16981d76 DW	93
7635d9cb MH	94	/*
	95	* to be used on vmas which are known to support THP.
	96	* Use transparent_hugepage_enabled otherwise
	97	*/
	98	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
16981d76 DW	99	{
	100	if (vma->vm_flags & VM_NOHUGEPAGE)
	101	return false;
	102
	103	if (is_vma_temporary_stack(vma))
	104	return false;
	105
	106	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	107	return false;
	108
	109	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
	110	return true;
	111
baabda26 DW	112	if (vma_is_dax(vma))
	113	return true;
	114
16981d76 DW	115	if (transparent_hugepage_flags &
	116	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	117	return !!(vma->vm_flags & VM_HUGEPAGE);
	118
	119	return false;
	120	}
	121
7635d9cb MH	122	bool transparent_hugepage_enabled(struct vm_area_struct *vma);
7635d9cb MH	123
43675e6f YS	124	#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
	125
	126	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	127	unsigned long haddr)
	128	{
	129	/* Don't have to check pgoff for anonymous vma */
	130	if (!vma_is_anonymous(vma)) {
	131	if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
	132	(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
	133	return false;
	134	}
	135
	136	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	137	return false;
	138	return true;
	139	}
	140
79da5407 KS	141	#define transparent_hugepage_use_zero_page() \
	142	(transparent_hugepage_flags & \
	143	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	144	#ifdef CONFIG_DEBUG_VM
	145	#define transparent_hugepage_debug_cow() \
	146	(transparent_hugepage_flags & \
	147	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	148	#else /* CONFIG_DEBUG_VM */
	149	#define transparent_hugepage_debug_cow() 0
	150	#endif /* CONFIG_DEBUG_VM */
	151
74d2fad1 TK	152	extern unsigned long thp_get_unmapped_area(struct file *filp,
	153	unsigned long addr, unsigned long len, unsigned long pgoff,
	154	unsigned long flags);
	155
9a982250 KS	156	extern void prep_transhuge_page(struct page *page);
	157	extern void free_transhuge_page(struct page *page);
	158
b8f593cd	159	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	160	int split_huge_page_to_list(struct page page, struct list_head list);
	161	static inline int split_huge_page(struct page *page)
	162	{
	163	return split_huge_page_to_list(page, NULL);
	164	}
9a982250	165	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	166
eef1b3ba KS	167	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	168	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	169
	170	#define split_huge_pmd(__vma, __pmd, __address) \
	171	do { \
	172	pmd_t *____pmd = (__pmd); \
84c3fc4e	173	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	174	\|\| pmd_devmap(*____pmd)) \
fec89c10	175	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	176	false, NULL); \
eef1b3ba	177	} while (0)
ad0bed24	178
2a52bcbc	179
fec89c10 KS	180	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	181	bool freeze, struct page *page);
2a52bcbc	182
a00cc7d9 MW	183	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	184	unsigned long address);
	185
	186	#define split_huge_pud(__vma, __pud, __address) \
	187	do { \
	188	pud_t *____pud = (__pud); \
	189	if (pud_trans_huge(*____pud) \
	190	\|\| pud_devmap(*____pud)) \
	191	__split_huge_pud(__vma, __pud, __address); \
	192	} while (0)
	193
60ab3244 AA	194	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	195	unsigned long *vm_flags, int advice);
e1b9996b	196	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	197	unsigned long start,
	198	unsigned long end,
	199	long adjust_next);
b6ec57f4 KS	200	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	201	struct vm_area_struct *vma);
a00cc7d9 MW	202	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	203	struct vm_area_struct *vma);
84c3fc4e ZY	204
	205	static inline int is_swap_pmd(pmd_t pmd)
	206	{
	207	return !pmd_none(pmd) && !pmd_present(pmd);
	208	}
	209
025c5b24	210	/* mmap_sem must be held on entry */
b6ec57f4 KS	211	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	212	struct vm_area_struct *vma)
025c5b24	213	{
81d1b09c	214	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
84c3fc4e	215	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	216	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	217	else
969e8d7e	218	return NULL;
025c5b24	219	}
a00cc7d9 MW	220	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	221	struct vm_area_struct *vma)
	222	{
	223	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	224	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	225	return __pud_trans_huge_lock(pud, vma);
	226	else
	227	return NULL;
	228	}
2c888cfb RR	229	static inline int hpage_nr_pages(struct page *page)
	230	{
	231	if (unlikely(PageTransHuge(page)))
	232	return HPAGE_PMD_NR;
	233	return 1;
	234	}
d10e63f2	235
a00cc7d9	236	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	237	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	238	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	239	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	240
2b740303	241	extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	242
56873f43 WY	243	extern struct page *huge_zero_page;
	244
	245	static inline bool is_huge_zero_page(struct page *page)
	246	{
6aa7de05	247	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	248	}
56873f43 WY	249
fc437044 MW	250	static inline bool is_huge_zero_pmd(pmd_t pmd)
	251	{
	252	return is_huge_zero_page(pmd_page(pmd));
	253	}
	254
a00cc7d9 MW	255	static inline bool is_huge_zero_pud(pud_t pud)
	256	{
	257	return false;
	258	}
	259
6fcb52a5 AL	260	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	261	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	262
10102459 KS	263	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	264
9c670ea3 NH	265	static inline bool thp_migration_supported(void)
	266	{
	267	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	268	}
	269
87eaceb3 YS	270	static inline struct list_head page_deferred_list(struct page page)
	271	{
	272	/*
	273	* Global or memcg deferred list in the second tail pages is
	274	* occupied by compound_head.
	275	*/
	276	return &page[2].deferred_list;
	277	}
	278
71e3aac0	279	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	280	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	281	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	282	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	283
a00cc7d9 MW	284	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	285	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	286	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	287
2c888cfb RR	288	#define hpage_nr_pages(x) 1
2c888cfb RR	289
7635d9cb MH	290	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	291	{
	292	return false;
	293	}
	294
16981d76 DW	295	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	296	{
	297	return false;
	298	}
71e3aac0	299
43675e6f YS	300	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	301	unsigned long haddr)
	302	{
	303	return false;
	304	}
	305
800d8c63 KS	306	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	307
71e3aac0	308	#define transparent_hugepage_flags 0UL
74d2fad1 TK	309
	310	#define thp_get_unmapped_area NULL
	311
b8f593cd HY	312	static inline bool
	313	can_split_huge_page(struct page page, int pextra_pins)
	314	{
	315	BUILD_BUG();
	316	return false;
	317	}
5bc7b8ac SL	318	static inline int
	319	split_huge_page_to_list(struct page page, struct list_head list)
	320	{
	321	return 0;
	322	}
71e3aac0 AA	323	static inline int split_huge_page(struct page *page)
	324	{
	325	return 0;
	326	}
9a982250	327	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	328	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	329	do { } while (0)
2a52bcbc	330
fd60775a DR	331	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	332	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	333	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	334	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	335
a00cc7d9 MW	336	#define split_huge_pud(__vma, __pmd, __address) \
	337	do { } while (0)
	338
60ab3244 AA	339	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	340	unsigned long *vm_flags, int advice)
0af4e98b AA	341	{
	342	BUG();
	343	return 0;
	344	}
94fcc585 AA	345	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	346	unsigned long start,
	347	unsigned long end,
	348	long adjust_next)
	349	{
	350	}
84c3fc4e ZY	351	static inline int is_swap_pmd(pmd_t pmd)
	352	{
	353	return 0;
	354	}
b6ec57f4 KS	355	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	356	struct vm_area_struct *vma)
025c5b24	357	{
b6ec57f4	358	return NULL;
025c5b24	359	}
a00cc7d9 MW	360	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	361	struct vm_area_struct *vma)
	362	{
	363	return NULL;
	364	}
d10e63f2	365
2b740303 SJ	366	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	367	pmd_t orig_pmd)
d10e63f2	368	{
4daae3b4	369	return 0;
d10e63f2 MG	370	}
d10e63f2 MG	371
56873f43 WY	372	static inline bool is_huge_zero_page(struct page *page)
	373	{
	374	return false;
	375	}
	376
a00cc7d9 MW	377	static inline bool is_huge_zero_pud(pud_t pud)
	378	{
	379	return false;
	380	}
	381
6fcb52a5	382	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	383	{
6fcb52a5	384	return;
aa88b68c	385	}
3565fce3 DW	386
3565fce3 DW	387	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	388	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	389	{
	390	return NULL;
	391	}
a00cc7d9 MW	392
a00cc7d9 MW	393	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	394	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	395	{
	396	return NULL;
	397	}
9c670ea3 NH	398
	399	static inline bool thp_migration_supported(void)
	400	{
	401	return false;
	402	}
71e3aac0 AA	403	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	404
	405	#endif /* _LINUX_HUGE_MM_H */