[mirror_ubuntu-jammy-kernel.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_area_struct *vma, unsigned long addr,
			pmd_t *pmd, pfn_t pfn, bool write);
vm_fault_t 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);

extern unsigned long transparent_hugepage_flags;

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;
}

#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);
}

#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 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);
226ab561	50	vm_fault_t vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
a00cc7d9	51	pmd_t *pmd, pfn_t pfn, bool write);
226ab561	52	vm_fault_t vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
a00cc7d9	53	pud_t *pud, pfn_t pfn, bool write);
71e3aac0 AA	54	enum transparent_hugepage_flag {
	55	TRANSPARENT_HUGEPAGE_FLAG,
	56	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	57	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	58	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	59	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	60	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	61	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	62	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	63	#ifdef CONFIG_DEBUG_VM
	64	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	65	#endif
	66	};
	67
b46e756f KS	68	struct kobject;
	69	struct kobj_attribute;
	70
	71	extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
	72	struct kobj_attribute *attr,
	73	const char *buf, size_t count,
	74	enum transparent_hugepage_flag flag);
	75	extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
	76	struct kobj_attribute attr, char buf,
	77	enum transparent_hugepage_flag flag);
5a6e75f8 KS	78	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	79
d8c37c48 NH	80	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	81	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	82
71e3aac0	83	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	84	#define HPAGE_PMD_SHIFT PMD_SHIFT
	85	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	86	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	87
a00cc7d9 MW	88	#define HPAGE_PUD_SHIFT PUD_SHIFT
	89	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	90	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	91
20995974 AS	92	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	93
16981d76 DW	94	extern unsigned long transparent_hugepage_flags;
	95
	96	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	97	{
	98	if (vma->vm_flags & VM_NOHUGEPAGE)
	99	return false;
	100
	101	if (is_vma_temporary_stack(vma))
	102	return false;
	103
	104	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	105	return false;
	106
	107	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
	108	return true;
	109
baabda26 DW	110	if (vma_is_dax(vma))
	111	return true;
	112
16981d76 DW	113	if (transparent_hugepage_flags &
	114	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	115	return !!(vma->vm_flags & VM_HUGEPAGE);
	116
	117	return false;
	118	}
	119
79da5407 KS	120	#define transparent_hugepage_use_zero_page() \
	121	(transparent_hugepage_flags & \
	122	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	123	#ifdef CONFIG_DEBUG_VM
	124	#define transparent_hugepage_debug_cow() \
	125	(transparent_hugepage_flags & \
	126	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	127	#else /* CONFIG_DEBUG_VM */
	128	#define transparent_hugepage_debug_cow() 0
	129	#endif /* CONFIG_DEBUG_VM */
	130
74d2fad1 TK	131	extern unsigned long thp_get_unmapped_area(struct file *filp,
	132	unsigned long addr, unsigned long len, unsigned long pgoff,
	133	unsigned long flags);
	134
9a982250 KS	135	extern void prep_transhuge_page(struct page *page);
	136	extern void free_transhuge_page(struct page *page);
	137
b8f593cd	138	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	139	int split_huge_page_to_list(struct page page, struct list_head list);
	140	static inline int split_huge_page(struct page *page)
	141	{
	142	return split_huge_page_to_list(page, NULL);
	143	}
9a982250	144	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	145
eef1b3ba KS	146	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	147	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	148
	149	#define split_huge_pmd(__vma, __pmd, __address) \
	150	do { \
	151	pmd_t *____pmd = (__pmd); \
84c3fc4e	152	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	153	\|\| pmd_devmap(*____pmd)) \
fec89c10	154	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	155	false, NULL); \
eef1b3ba	156	} while (0)
ad0bed24	157
2a52bcbc	158
fec89c10 KS	159	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	160	bool freeze, struct page *page);
2a52bcbc	161
a00cc7d9 MW	162	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	163	unsigned long address);
	164
	165	#define split_huge_pud(__vma, __pud, __address) \
	166	do { \
	167	pud_t *____pud = (__pud); \
	168	if (pud_trans_huge(*____pud) \
	169	\|\| pud_devmap(*____pud)) \
	170	__split_huge_pud(__vma, __pud, __address); \
	171	} while (0)
	172
60ab3244 AA	173	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	174	unsigned long *vm_flags, int advice);
e1b9996b	175	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	176	unsigned long start,
	177	unsigned long end,
	178	long adjust_next);
b6ec57f4 KS	179	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	180	struct vm_area_struct *vma);
a00cc7d9 MW	181	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	182	struct vm_area_struct *vma);
84c3fc4e ZY	183
	184	static inline int is_swap_pmd(pmd_t pmd)
	185	{
	186	return !pmd_none(pmd) && !pmd_present(pmd);
	187	}
	188
025c5b24	189	/* mmap_sem must be held on entry */
b6ec57f4 KS	190	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	191	struct vm_area_struct *vma)
025c5b24	192	{
81d1b09c	193	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
84c3fc4e	194	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	195	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	196	else
969e8d7e	197	return NULL;
025c5b24	198	}
a00cc7d9 MW	199	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	200	struct vm_area_struct *vma)
	201	{
	202	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	203	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	204	return __pud_trans_huge_lock(pud, vma);
	205	else
	206	return NULL;
	207	}
2c888cfb RR	208	static inline int hpage_nr_pages(struct page *page)
	209	{
	210	if (unlikely(PageTransHuge(page)))
	211	return HPAGE_PMD_NR;
	212	return 1;
	213	}
d10e63f2	214
a00cc7d9	215	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	216	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	217	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	218	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	219
2b740303	220	extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	221
56873f43 WY	222	extern struct page *huge_zero_page;
	223
	224	static inline bool is_huge_zero_page(struct page *page)
	225	{
6aa7de05	226	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	227	}
56873f43 WY	228
fc437044 MW	229	static inline bool is_huge_zero_pmd(pmd_t pmd)
	230	{
	231	return is_huge_zero_page(pmd_page(pmd));
	232	}
	233
a00cc7d9 MW	234	static inline bool is_huge_zero_pud(pud_t pud)
	235	{
	236	return false;
	237	}
	238
6fcb52a5 AL	239	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	240	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	241
10102459 KS	242	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	243
9c670ea3 NH	244	static inline bool thp_migration_supported(void)
	245	{
	246	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	247	}
	248
71e3aac0	249	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	250	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	251	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	252	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	253
a00cc7d9 MW	254	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	255	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	256	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	257
2c888cfb RR	258	#define hpage_nr_pages(x) 1
2c888cfb RR	259
16981d76 DW	260	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	261	{
	262	return false;
	263	}
71e3aac0	264
800d8c63 KS	265	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	266
71e3aac0	267	#define transparent_hugepage_flags 0UL
74d2fad1 TK	268
	269	#define thp_get_unmapped_area NULL
	270
b8f593cd HY	271	static inline bool
	272	can_split_huge_page(struct page page, int pextra_pins)
	273	{
	274	BUILD_BUG();
	275	return false;
	276	}
5bc7b8ac SL	277	static inline int
	278	split_huge_page_to_list(struct page page, struct list_head list)
	279	{
	280	return 0;
	281	}
71e3aac0 AA	282	static inline int split_huge_page(struct page *page)
	283	{
	284	return 0;
	285	}
9a982250	286	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	287	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	288	do { } while (0)
2a52bcbc	289
fd60775a DR	290	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	291	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	292	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	293	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	294
a00cc7d9 MW	295	#define split_huge_pud(__vma, __pmd, __address) \
	296	do { } while (0)
	297
60ab3244 AA	298	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	299	unsigned long *vm_flags, int advice)
0af4e98b AA	300	{
	301	BUG();
	302	return 0;
	303	}
94fcc585 AA	304	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	305	unsigned long start,
	306	unsigned long end,
	307	long adjust_next)
	308	{
	309	}
84c3fc4e ZY	310	static inline int is_swap_pmd(pmd_t pmd)
	311	{
	312	return 0;
	313	}
b6ec57f4 KS	314	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	315	struct vm_area_struct *vma)
025c5b24	316	{
b6ec57f4	317	return NULL;
025c5b24	318	}
a00cc7d9 MW	319	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	320	struct vm_area_struct *vma)
	321	{
	322	return NULL;
	323	}
d10e63f2	324
2b740303 SJ	325	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	326	pmd_t orig_pmd)
d10e63f2	327	{
4daae3b4	328	return 0;
d10e63f2 MG	329	}
d10e63f2 MG	330
56873f43 WY	331	static inline bool is_huge_zero_page(struct page *page)
	332	{
	333	return false;
	334	}
	335
a00cc7d9 MW	336	static inline bool is_huge_zero_pud(pud_t pud)
	337	{
	338	return false;
	339	}
	340
6fcb52a5	341	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	342	{
6fcb52a5	343	return;
aa88b68c	344	}
3565fce3 DW	345
3565fce3 DW	346	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	347	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	348	{
	349	return NULL;
	350	}
a00cc7d9 MW	351
a00cc7d9 MW	352	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	353	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	354	{
	355	return NULL;
	356	}
9c670ea3 NH	357
	358	static inline bool thp_migration_supported(void)
	359	{
	360	return false;
	361	}
71e3aac0 AA	362	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	363
	364	#endif /* _LINUX_HUGE_MM_H */