[mirror_ubuntu-focal-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_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;
	/*
	 * For dax vmas, try to always use hugepage mappings. If the kernel does
	 * not support hugepages, fsdax mappings will fallback to PAGE_SIZE
	 * mappings, and device-dax namespaces, that try to guarantee a given
	 * mapping size, will fail to enable
	 */
	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;
f5376699 AK	111	/*
	112	* For dax vmas, try to always use hugepage mappings. If the kernel does
	113	* not support hugepages, fsdax mappings will fallback to PAGE_SIZE
	114	* mappings, and device-dax namespaces, that try to guarantee a given
	115	* mapping size, will fail to enable
	116	*/
baabda26 DW	117	if (vma_is_dax(vma))
	118	return true;
	119
16981d76 DW	120	if (transparent_hugepage_flags &
	121	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	122	return !!(vma->vm_flags & VM_HUGEPAGE);
	123
	124	return false;
	125	}
	126
7635d9cb MH	127	bool transparent_hugepage_enabled(struct vm_area_struct *vma);
7635d9cb MH	128
43675e6f YS	129	#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
	130
	131	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	132	unsigned long haddr)
	133	{
	134	/* Don't have to check pgoff for anonymous vma */
	135	if (!vma_is_anonymous(vma)) {
	136	if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
	137	(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
	138	return false;
	139	}
	140
	141	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	142	return false;
	143	return true;
	144	}
	145
79da5407 KS	146	#define transparent_hugepage_use_zero_page() \
	147	(transparent_hugepage_flags & \
	148	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	149	#ifdef CONFIG_DEBUG_VM
	150	#define transparent_hugepage_debug_cow() \
	151	(transparent_hugepage_flags & \
	152	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	153	#else /* CONFIG_DEBUG_VM */
	154	#define transparent_hugepage_debug_cow() 0
	155	#endif /* CONFIG_DEBUG_VM */
	156
74d2fad1 TK	157	extern unsigned long thp_get_unmapped_area(struct file *filp,
	158	unsigned long addr, unsigned long len, unsigned long pgoff,
	159	unsigned long flags);
	160
9a982250 KS	161	extern void prep_transhuge_page(struct page *page);
	162	extern void free_transhuge_page(struct page *page);
	163
b8f593cd	164	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	165	int split_huge_page_to_list(struct page page, struct list_head list);
	166	static inline int split_huge_page(struct page *page)
	167	{
	168	return split_huge_page_to_list(page, NULL);
	169	}
9a982250	170	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	171
eef1b3ba KS	172	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	173	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	174
	175	#define split_huge_pmd(__vma, __pmd, __address) \
	176	do { \
	177	pmd_t *____pmd = (__pmd); \
84c3fc4e	178	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	179	\|\| pmd_devmap(*____pmd)) \
fec89c10	180	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	181	false, NULL); \
eef1b3ba	182	} while (0)
ad0bed24	183
2a52bcbc	184
fec89c10 KS	185	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	186	bool freeze, struct page *page);
2a52bcbc	187
a00cc7d9 MW	188	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	189	unsigned long address);
	190
	191	#define split_huge_pud(__vma, __pud, __address) \
	192	do { \
	193	pud_t *____pud = (__pud); \
	194	if (pud_trans_huge(*____pud) \
	195	\|\| pud_devmap(*____pud)) \
	196	__split_huge_pud(__vma, __pud, __address); \
	197	} while (0)
	198
60ab3244 AA	199	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	200	unsigned long *vm_flags, int advice);
e1b9996b	201	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	202	unsigned long start,
	203	unsigned long end,
	204	long adjust_next);
b6ec57f4 KS	205	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	206	struct vm_area_struct *vma);
a00cc7d9 MW	207	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	208	struct vm_area_struct *vma);
84c3fc4e ZY	209
	210	static inline int is_swap_pmd(pmd_t pmd)
	211	{
	212	return !pmd_none(pmd) && !pmd_present(pmd);
	213	}
	214
025c5b24	215	/* mmap_sem must be held on entry */
b6ec57f4 KS	216	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	217	struct vm_area_struct *vma)
025c5b24	218	{
81d1b09c	219	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
84c3fc4e	220	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	221	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	222	else
969e8d7e	223	return NULL;
025c5b24	224	}
a00cc7d9 MW	225	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	226	struct vm_area_struct *vma)
	227	{
	228	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	229	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	230	return __pud_trans_huge_lock(pud, vma);
	231	else
	232	return NULL;
	233	}
2c888cfb RR	234	static inline int hpage_nr_pages(struct page *page)
	235	{
	236	if (unlikely(PageTransHuge(page)))
	237	return HPAGE_PMD_NR;
	238	return 1;
	239	}
d10e63f2	240
a00cc7d9	241	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	242	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	243	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	244	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	245
2b740303	246	extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	247
56873f43 WY	248	extern struct page *huge_zero_page;
	249
	250	static inline bool is_huge_zero_page(struct page *page)
	251	{
6aa7de05	252	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	253	}
56873f43 WY	254
fc437044 MW	255	static inline bool is_huge_zero_pmd(pmd_t pmd)
	256	{
	257	return is_huge_zero_page(pmd_page(pmd));
	258	}
	259
a00cc7d9 MW	260	static inline bool is_huge_zero_pud(pud_t pud)
	261	{
	262	return false;
	263	}
	264
6fcb52a5 AL	265	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	266	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	267
10102459 KS	268	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	269
9c670ea3 NH	270	static inline bool thp_migration_supported(void)
	271	{
	272	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	273	}
	274
87eaceb3 YS	275	static inline struct list_head page_deferred_list(struct page page)
	276	{
	277	/*
	278	* Global or memcg deferred list in the second tail pages is
	279	* occupied by compound_head.
	280	*/
	281	return &page[2].deferred_list;
	282	}
	283
71e3aac0	284	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	285	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	286	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	287	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	288
a00cc7d9 MW	289	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	290	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	291	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	292
2c888cfb RR	293	#define hpage_nr_pages(x) 1
2c888cfb RR	294
7635d9cb MH	295	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	296	{
	297	return false;
	298	}
	299
16981d76 DW	300	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	301	{
	302	return false;
	303	}
71e3aac0	304
43675e6f YS	305	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	306	unsigned long haddr)
	307	{
	308	return false;
	309	}
	310
800d8c63 KS	311	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	312
71e3aac0	313	#define transparent_hugepage_flags 0UL
74d2fad1 TK	314
	315	#define thp_get_unmapped_area NULL
	316
b8f593cd HY	317	static inline bool
	318	can_split_huge_page(struct page page, int pextra_pins)
	319	{
	320	BUILD_BUG();
	321	return false;
	322	}
5bc7b8ac SL	323	static inline int
	324	split_huge_page_to_list(struct page page, struct list_head list)
	325	{
	326	return 0;
	327	}
71e3aac0 AA	328	static inline int split_huge_page(struct page *page)
	329	{
	330	return 0;
	331	}
9a982250	332	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	333	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	334	do { } while (0)
2a52bcbc	335
fd60775a DR	336	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	337	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	338	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	339	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	340
a00cc7d9 MW	341	#define split_huge_pud(__vma, __pmd, __address) \
	342	do { } while (0)
	343
60ab3244 AA	344	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	345	unsigned long *vm_flags, int advice)
0af4e98b AA	346	{
	347	BUG();
	348	return 0;
	349	}
94fcc585 AA	350	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	351	unsigned long start,
	352	unsigned long end,
	353	long adjust_next)
	354	{
	355	}
84c3fc4e ZY	356	static inline int is_swap_pmd(pmd_t pmd)
	357	{
	358	return 0;
	359	}
b6ec57f4 KS	360	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	361	struct vm_area_struct *vma)
025c5b24	362	{
b6ec57f4	363	return NULL;
025c5b24	364	}
a00cc7d9 MW	365	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	366	struct vm_area_struct *vma)
	367	{
	368	return NULL;
	369	}
d10e63f2	370
2b740303 SJ	371	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	372	pmd_t orig_pmd)
d10e63f2	373	{
4daae3b4	374	return 0;
d10e63f2 MG	375	}
d10e63f2 MG	376
56873f43 WY	377	static inline bool is_huge_zero_page(struct page *page)
	378	{
	379	return false;
	380	}
	381
a00cc7d9 MW	382	static inline bool is_huge_zero_pud(pud_t pud)
	383	{
	384	return false;
	385	}
	386
6fcb52a5	387	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	388	{
6fcb52a5	389	return;
aa88b68c	390	}
3565fce3 DW	391
3565fce3 DW	392	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	393	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	394	{
	395	return NULL;
	396	}
a00cc7d9 MW	397
a00cc7d9 MW	398	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	399	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	400	{
	401	return NULL;
	402	}
9c670ea3 NH	403
	404	static inline bool thp_migration_supported(void)
	405	{
	406	return false;
	407	}
71e3aac0 AA	408	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	409
	410	#endif /* _LINUX_HUGE_MM_H */