[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;

/*
 * 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 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 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;
16981d76 DW	95
7635d9cb MH	96	/*
	97	* to be used on vmas which are known to support THP.
	98	* Use transparent_hugepage_enabled otherwise
	99	*/
	100	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
16981d76 DW	101	{
	102	if (vma->vm_flags & VM_NOHUGEPAGE)
	103	return false;
	104
	105	if (is_vma_temporary_stack(vma))
	106	return false;
	107
	108	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	109	return false;
	110
	111	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
	112	return true;
	113
baabda26 DW	114	if (vma_is_dax(vma))
	115	return true;
	116
16981d76 DW	117	if (transparent_hugepage_flags &
	118	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	119	return !!(vma->vm_flags & VM_HUGEPAGE);
	120
	121	return false;
	122	}
	123
7635d9cb MH	124	bool transparent_hugepage_enabled(struct vm_area_struct *vma);
7635d9cb MH	125
79da5407 KS	126	#define transparent_hugepage_use_zero_page() \
	127	(transparent_hugepage_flags & \
	128	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	129	#ifdef CONFIG_DEBUG_VM
	130	#define transparent_hugepage_debug_cow() \
	131	(transparent_hugepage_flags & \
	132	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	133	#else /* CONFIG_DEBUG_VM */
	134	#define transparent_hugepage_debug_cow() 0
	135	#endif /* CONFIG_DEBUG_VM */
	136
74d2fad1 TK	137	extern unsigned long thp_get_unmapped_area(struct file *filp,
	138	unsigned long addr, unsigned long len, unsigned long pgoff,
	139	unsigned long flags);
	140
9a982250 KS	141	extern void prep_transhuge_page(struct page *page);
	142	extern void free_transhuge_page(struct page *page);
	143
b8f593cd	144	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	145	int split_huge_page_to_list(struct page page, struct list_head list);
	146	static inline int split_huge_page(struct page *page)
	147	{
	148	return split_huge_page_to_list(page, NULL);
	149	}
9a982250	150	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	151
eef1b3ba KS	152	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	153	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	154
	155	#define split_huge_pmd(__vma, __pmd, __address) \
	156	do { \
	157	pmd_t *____pmd = (__pmd); \
84c3fc4e	158	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	159	\|\| pmd_devmap(*____pmd)) \
fec89c10	160	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	161	false, NULL); \
eef1b3ba	162	} while (0)
ad0bed24	163
2a52bcbc	164
fec89c10 KS	165	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	166	bool freeze, struct page *page);
2a52bcbc	167
a00cc7d9 MW	168	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	169	unsigned long address);
	170
	171	#define split_huge_pud(__vma, __pud, __address) \
	172	do { \
	173	pud_t *____pud = (__pud); \
	174	if (pud_trans_huge(*____pud) \
	175	\|\| pud_devmap(*____pud)) \
	176	__split_huge_pud(__vma, __pud, __address); \
	177	} while (0)
	178
60ab3244 AA	179	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	180	unsigned long *vm_flags, int advice);
e1b9996b	181	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	182	unsigned long start,
	183	unsigned long end,
	184	long adjust_next);
b6ec57f4 KS	185	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	186	struct vm_area_struct *vma);
a00cc7d9 MW	187	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	188	struct vm_area_struct *vma);
84c3fc4e ZY	189
	190	static inline int is_swap_pmd(pmd_t pmd)
	191	{
	192	return !pmd_none(pmd) && !pmd_present(pmd);
	193	}
	194
025c5b24	195	/* mmap_sem must be held on entry */
b6ec57f4 KS	196	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	197	struct vm_area_struct *vma)
025c5b24	198	{
81d1b09c	199	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
84c3fc4e	200	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	201	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	202	else
969e8d7e	203	return NULL;
025c5b24	204	}
a00cc7d9 MW	205	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	206	struct vm_area_struct *vma)
	207	{
	208	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	209	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	210	return __pud_trans_huge_lock(pud, vma);
	211	else
	212	return NULL;
	213	}
2c888cfb RR	214	static inline int hpage_nr_pages(struct page *page)
	215	{
	216	if (unlikely(PageTransHuge(page)))
	217	return HPAGE_PMD_NR;
	218	return 1;
	219	}
d10e63f2	220
a00cc7d9	221	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	222	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	223	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	224	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	225
2b740303	226	extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	227
56873f43 WY	228	extern struct page *huge_zero_page;
	229
	230	static inline bool is_huge_zero_page(struct page *page)
	231	{
6aa7de05	232	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	233	}
56873f43 WY	234
fc437044 MW	235	static inline bool is_huge_zero_pmd(pmd_t pmd)
	236	{
	237	return is_huge_zero_page(pmd_page(pmd));
	238	}
	239
a00cc7d9 MW	240	static inline bool is_huge_zero_pud(pud_t pud)
	241	{
	242	return false;
	243	}
	244
6fcb52a5 AL	245	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	246	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	247
10102459 KS	248	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	249
9c670ea3 NH	250	static inline bool thp_migration_supported(void)
	251	{
	252	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	253	}
	254
71e3aac0	255	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	256	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	257	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	258	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	259
a00cc7d9 MW	260	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	261	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	262	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	263
2c888cfb RR	264	#define hpage_nr_pages(x) 1
2c888cfb RR	265
7635d9cb MH	266	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	267	{
	268	return false;
	269	}
	270
16981d76 DW	271	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	272	{
	273	return false;
	274	}
71e3aac0	275
800d8c63 KS	276	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	277
71e3aac0	278	#define transparent_hugepage_flags 0UL
74d2fad1 TK	279
	280	#define thp_get_unmapped_area NULL
	281
b8f593cd HY	282	static inline bool
	283	can_split_huge_page(struct page page, int pextra_pins)
	284	{
	285	BUILD_BUG();
	286	return false;
	287	}
5bc7b8ac SL	288	static inline int
	289	split_huge_page_to_list(struct page page, struct list_head list)
	290	{
	291	return 0;
	292	}
71e3aac0 AA	293	static inline int split_huge_page(struct page *page)
	294	{
	295	return 0;
	296	}
9a982250	297	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	298	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	299	do { } while (0)
2a52bcbc	300
fd60775a DR	301	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	302	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	303	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	304	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	305
a00cc7d9 MW	306	#define split_huge_pud(__vma, __pmd, __address) \
	307	do { } while (0)
	308
60ab3244 AA	309	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	310	unsigned long *vm_flags, int advice)
0af4e98b AA	311	{
	312	BUG();
	313	return 0;
	314	}
94fcc585 AA	315	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	316	unsigned long start,
	317	unsigned long end,
	318	long adjust_next)
	319	{
	320	}
84c3fc4e ZY	321	static inline int is_swap_pmd(pmd_t pmd)
	322	{
	323	return 0;
	324	}
b6ec57f4 KS	325	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	326	struct vm_area_struct *vma)
025c5b24	327	{
b6ec57f4	328	return NULL;
025c5b24	329	}
a00cc7d9 MW	330	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	331	struct vm_area_struct *vma)
	332	{
	333	return NULL;
	334	}
d10e63f2	335
2b740303 SJ	336	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	337	pmd_t orig_pmd)
d10e63f2	338	{
4daae3b4	339	return 0;
d10e63f2 MG	340	}
d10e63f2 MG	341
56873f43 WY	342	static inline bool is_huge_zero_page(struct page *page)
	343	{
	344	return false;
	345	}
	346
a00cc7d9 MW	347	static inline bool is_huge_zero_pud(pud_t pud)
	348	{
	349	return false;
	350	}
	351
6fcb52a5	352	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	353	{
6fcb52a5	354	return;
aa88b68c	355	}
3565fce3 DW	356
3565fce3 DW	357	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	358	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	359	{
	360	return NULL;
	361	}
a00cc7d9 MW	362
a00cc7d9 MW	363	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	364	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	365	{
	366	return NULL;
	367	}
9c670ea3 NH	368
	369	static inline bool thp_migration_supported(void)
	370	{
	371	return false;
	372	}
71e3aac0 AA	373	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	374
	375	#endif /* _LINUX_HUGE_MM_H */