[mirror_ubuntu-bionic-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/fs.h> /* only for vma_is_dax() */

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);
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_fault *vmf, pfn_t pfn, bool write);
int 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;

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 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 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 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;
}

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 DW	5	#include <linux/sched/coredump.h>
16981d76 DW	6
baabda26 DW	7	#include <linux/fs.h> /* only for vma_is_dax() */
baabda26 DW	8
82b0f8c3	9	extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
71e3aac0 AA	10	extern int copy_huge_pmd(struct mm_struct dst_mm, struct mm_struct src_mm,
	11	pmd_t dst_pmd, pmd_t src_pmd, unsigned long addr,
	12	struct vm_area_struct *vma);
82b0f8c3	13	extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
a00cc7d9 MW	14	extern int copy_huge_pud(struct mm_struct dst_mm, struct mm_struct src_mm,
	15	pud_t dst_pud, pud_t src_pud, unsigned long addr,
	16	struct vm_area_struct *vma);
	17
	18	#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
	19	extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
	20	#else
	21	static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
	22	{
	23	}
	24	#endif
	25
82b0f8c3	26	extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
b676b293	27	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	28	unsigned long addr,
	29	pmd_t *pmd,
	30	unsigned int flags);
319904ad	31	extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
b8d3c4c3 MK	32	struct vm_area_struct *vma,
b8d3c4c3 MK	33	pmd_t *pmd, unsigned long addr, unsigned long next);
71e3aac0 AA	34	extern int zap_huge_pmd(struct mmu_gather *tlb,
71e3aac0 AA	35	struct vm_area_struct *vma,
f21760b1	36	pmd_t *pmd, unsigned long addr);
a00cc7d9 MW	37	extern int zap_huge_pud(struct mmu_gather *tlb,
	38	struct vm_area_struct *vma,
	39	pud_t *pud, unsigned long addr);
0ca1634d JW	40	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	41	unsigned long addr, unsigned long end,
	42	unsigned char *vec);
bf8616d5	43	extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
37a1c49a	44	unsigned long new_addr, unsigned long old_end,
5ad4de30	45	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab	46	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5 MG	47	unsigned long addr, pgprot_t newprot,
4b10e7d5 MG	48	int prot_numa);
218fa1c8 DW	49	int vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
218fa1c8 DW	50	int vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
71e3aac0 AA	51	enum transparent_hugepage_flag {
	52	TRANSPARENT_HUGEPAGE_FLAG,
	53	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	54	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	55	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	56	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	57	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	58	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	59	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	60	#ifdef CONFIG_DEBUG_VM
	61	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	62	#endif
	63	};
	64
b46e756f KS	65	struct kobject;
	66	struct kobj_attribute;
	67
	68	extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
	69	struct kobj_attribute *attr,
	70	const char *buf, size_t count,
	71	enum transparent_hugepage_flag flag);
	72	extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
	73	struct kobj_attribute attr, char buf,
	74	enum transparent_hugepage_flag flag);
5a6e75f8 KS	75	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	76
d8c37c48 NH	77	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	78	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	79
71e3aac0	80	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	81	#define HPAGE_PMD_SHIFT PMD_SHIFT
	82	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	83	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	84
a00cc7d9 MW	85	#define HPAGE_PUD_SHIFT PUD_SHIFT
	86	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	87	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	88
20995974 AS	89	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	90
16981d76 DW	91	extern unsigned long transparent_hugepage_flags;
	92
	93	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	94	{
	95	if (vma->vm_flags & VM_NOHUGEPAGE)
	96	return false;
	97
	98	if (is_vma_temporary_stack(vma))
	99	return false;
	100
	101	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	102	return false;
	103
	104	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
	105	return true;
	106
baabda26 DW	107	if (vma_is_dax(vma))
	108	return true;
	109
16981d76 DW	110	if (transparent_hugepage_flags &
	111	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	112	return !!(vma->vm_flags & VM_HUGEPAGE);
	113
	114	return false;
	115	}
	116
79da5407 KS	117	#define transparent_hugepage_use_zero_page() \
	118	(transparent_hugepage_flags & \
	119	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	120	#ifdef CONFIG_DEBUG_VM
	121	#define transparent_hugepage_debug_cow() \
	122	(transparent_hugepage_flags & \
	123	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	124	#else /* CONFIG_DEBUG_VM */
	125	#define transparent_hugepage_debug_cow() 0
	126	#endif /* CONFIG_DEBUG_VM */
	127
74d2fad1 TK	128	extern unsigned long thp_get_unmapped_area(struct file *filp,
	129	unsigned long addr, unsigned long len, unsigned long pgoff,
	130	unsigned long flags);
	131
9a982250 KS	132	extern void prep_transhuge_page(struct page *page);
	133	extern void free_transhuge_page(struct page *page);
	134
b8f593cd	135	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	136	int split_huge_page_to_list(struct page page, struct list_head list);
	137	static inline int split_huge_page(struct page *page)
	138	{
	139	return split_huge_page_to_list(page, NULL);
	140	}
9a982250	141	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	142
eef1b3ba KS	143	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	144	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	145
	146	#define split_huge_pmd(__vma, __pmd, __address) \
	147	do { \
	148	pmd_t *____pmd = (__pmd); \
84c3fc4e	149	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	150	\|\| pmd_devmap(*____pmd)) \
fec89c10	151	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	152	false, NULL); \
eef1b3ba	153	} while (0)
ad0bed24	154
2a52bcbc	155
fec89c10 KS	156	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	157	bool freeze, struct page *page);
2a52bcbc	158
a00cc7d9 MW	159	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	160	unsigned long address);
	161
	162	#define split_huge_pud(__vma, __pud, __address) \
	163	do { \
	164	pud_t *____pud = (__pud); \
	165	if (pud_trans_huge(*____pud) \
	166	\|\| pud_devmap(*____pud)) \
	167	__split_huge_pud(__vma, __pud, __address); \
	168	} while (0)
	169
60ab3244 AA	170	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	171	unsigned long *vm_flags, int advice);
e1b9996b	172	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	173	unsigned long start,
	174	unsigned long end,
	175	long adjust_next);
b6ec57f4 KS	176	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	177	struct vm_area_struct *vma);
a00cc7d9 MW	178	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	179	struct vm_area_struct *vma);
84c3fc4e ZY	180
	181	static inline int is_swap_pmd(pmd_t pmd)
	182	{
	183	return !pmd_none(pmd) && !pmd_present(pmd);
	184	}
	185
025c5b24	186	/* mmap_sem must be held on entry */
b6ec57f4 KS	187	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	188	struct vm_area_struct *vma)
025c5b24	189	{
81d1b09c	190	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
84c3fc4e	191	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	192	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	193	else
969e8d7e	194	return NULL;
025c5b24	195	}
a00cc7d9 MW	196	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	197	struct vm_area_struct *vma)
	198	{
	199	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	200	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	201	return __pud_trans_huge_lock(pud, vma);
	202	else
	203	return NULL;
	204	}
2c888cfb RR	205	static inline int hpage_nr_pages(struct page *page)
	206	{
	207	if (unlikely(PageTransHuge(page)))
	208	return HPAGE_PMD_NR;
	209	return 1;
	210	}
d10e63f2	211
a00cc7d9 MW	212	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
	213	pmd_t *pmd, int flags);
	214	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
	215	pud_t *pud, int flags);
	216
82b0f8c3	217	extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	218
56873f43 WY	219	extern struct page *huge_zero_page;
	220
	221	static inline bool is_huge_zero_page(struct page *page)
	222	{
6aa7de05	223	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	224	}
56873f43 WY	225
fc437044 MW	226	static inline bool is_huge_zero_pmd(pmd_t pmd)
	227	{
	228	return is_huge_zero_page(pmd_page(pmd));
	229	}
	230
a00cc7d9 MW	231	static inline bool is_huge_zero_pud(pud_t pud)
	232	{
	233	return false;
	234	}
	235
6fcb52a5 AL	236	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	237	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	238
10102459 KS	239	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	240
9c670ea3 NH	241	static inline bool thp_migration_supported(void)
	242	{
	243	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	244	}
	245
71e3aac0	246	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	247	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	248	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	249	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	250
a00cc7d9 MW	251	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	252	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	253	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	254
2c888cfb RR	255	#define hpage_nr_pages(x) 1
2c888cfb RR	256
16981d76 DW	257	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	258	{
	259	return false;
	260	}
71e3aac0	261
800d8c63 KS	262	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	263
71e3aac0	264	#define transparent_hugepage_flags 0UL
74d2fad1 TK	265
	266	#define thp_get_unmapped_area NULL
	267
b8f593cd HY	268	static inline bool
	269	can_split_huge_page(struct page page, int pextra_pins)
	270	{
	271	BUILD_BUG();
	272	return false;
	273	}
5bc7b8ac SL	274	static inline int
	275	split_huge_page_to_list(struct page page, struct list_head list)
	276	{
	277	return 0;
	278	}
71e3aac0 AA	279	static inline int split_huge_page(struct page *page)
	280	{
	281	return 0;
	282	}
9a982250	283	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	284	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	285	do { } while (0)
2a52bcbc	286
fd60775a DR	287	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	288	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	289	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	290	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	291
a00cc7d9 MW	292	#define split_huge_pud(__vma, __pmd, __address) \
	293	do { } while (0)
	294
60ab3244 AA	295	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	296	unsigned long *vm_flags, int advice)
0af4e98b AA	297	{
	298	BUG();
	299	return 0;
	300	}
94fcc585 AA	301	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	302	unsigned long start,
	303	unsigned long end,
	304	long adjust_next)
	305	{
	306	}
84c3fc4e ZY	307	static inline int is_swap_pmd(pmd_t pmd)
	308	{
	309	return 0;
	310	}
b6ec57f4 KS	311	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	312	struct vm_area_struct *vma)
025c5b24	313	{
b6ec57f4	314	return NULL;
025c5b24	315	}
a00cc7d9 MW	316	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	317	struct vm_area_struct *vma)
	318	{
	319	return NULL;
	320	}
d10e63f2	321
82b0f8c3	322	static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
d10e63f2	323	{
4daae3b4	324	return 0;
d10e63f2 MG	325	}
d10e63f2 MG	326
56873f43 WY	327	static inline bool is_huge_zero_page(struct page *page)
	328	{
	329	return false;
	330	}
	331
a00cc7d9 MW	332	static inline bool is_huge_zero_pud(pud_t pud)
	333	{
	334	return false;
	335	}
	336
6fcb52a5	337	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	338	{
6fcb52a5	339	return;
aa88b68c	340	}
3565fce3 DW	341
	342	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
	343	unsigned long addr, pmd_t *pmd, int flags)
	344	{
	345	return NULL;
	346	}
a00cc7d9 MW	347
	348	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
	349	unsigned long addr, pud_t *pud, int flags)
	350	{
	351	return NULL;
	352	}
9c670ea3 NH	353
	354	static inline bool thp_migration_supported(void)
	355	{
	356	return false;
	357	}
71e3aac0 AA	358	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	359
	360	#endif /* _LINUX_HUGE_MM_H */