1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 extern int do_huge_pmd_anonymous_page(struct fault_env *fe);
5 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
6 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
7 struct vm_area_struct *vma);
8 extern void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd);
9 extern int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd);
10 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
14 extern int madvise_free_huge_pmd(struct mmu_gather *tlb,
15 struct vm_area_struct *vma,
16 pmd_t *pmd, unsigned long addr, unsigned long next);
17 extern int zap_huge_pmd(struct mmu_gather *tlb,
18 struct vm_area_struct *vma,
19 pmd_t *pmd, unsigned long addr);
20 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
21 unsigned long addr, unsigned long end,
23 extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
24 unsigned long new_addr, unsigned long old_end,
25 pmd_t *old_pmd, pmd_t *new_pmd);
26 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
27 unsigned long addr, pgprot_t newprot,
29 int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
30 pfn_t pfn, bool write);
31 enum transparent_hugepage_flag {
32 TRANSPARENT_HUGEPAGE_FLAG,
33 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
34 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
35 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
36 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
37 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
38 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
39 #ifdef CONFIG_DEBUG_VM
40 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
44 extern struct kobj_attribute shmem_enabled_attr;
46 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
47 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
49 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
50 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
51 pmd_t *pmd, int flags);
53 #define HPAGE_PMD_SHIFT PMD_SHIFT
54 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
55 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
57 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
59 #define transparent_hugepage_enabled(__vma) \
60 ((transparent_hugepage_flags & \
61 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
62 (transparent_hugepage_flags & \
63 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
64 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
65 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
66 !is_vma_temporary_stack(__vma))
67 #define transparent_hugepage_use_zero_page() \
68 (transparent_hugepage_flags & \
69 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
70 #ifdef CONFIG_DEBUG_VM
71 #define transparent_hugepage_debug_cow() \
72 (transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
74 #else /* CONFIG_DEBUG_VM */
75 #define transparent_hugepage_debug_cow() 0
76 #endif /* CONFIG_DEBUG_VM */
78 extern unsigned long transparent_hugepage_flags;
80 extern void prep_transhuge_page(struct page *page);
81 extern void free_transhuge_page(struct page *page);
83 int split_huge_page_to_list(struct page *page, struct list_head *list);
84 static inline int split_huge_page(struct page *page)
86 return split_huge_page_to_list(page, NULL);
88 void deferred_split_huge_page(struct page *page);
90 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
91 unsigned long address, bool freeze, struct page *page);
93 #define split_huge_pmd(__vma, __pmd, __address) \
95 pmd_t *____pmd = (__pmd); \
96 if (pmd_trans_huge(*____pmd) \
97 || pmd_devmap(*____pmd)) \
98 __split_huge_pmd(__vma, __pmd, __address, \
103 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
104 bool freeze, struct page *page);
106 extern int hugepage_madvise(struct vm_area_struct *vma,
107 unsigned long *vm_flags, int advice);
108 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
112 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
113 struct vm_area_struct *vma);
114 /* mmap_sem must be held on entry */
115 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
116 struct vm_area_struct *vma)
118 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
119 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
120 return __pmd_trans_huge_lock(pmd, vma);
124 static inline int hpage_nr_pages(struct page *page)
126 if (unlikely(PageTransHuge(page)))
131 extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
133 extern struct page *huge_zero_page;
135 static inline bool is_huge_zero_page(struct page *page)
137 return ACCESS_ONCE(huge_zero_page) == page;
140 static inline bool is_huge_zero_pmd(pmd_t pmd)
142 return is_huge_zero_page(pmd_page(pmd));
145 struct page *get_huge_zero_page(void);
146 void put_huge_zero_page(void);
148 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
150 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
151 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
152 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
153 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
155 #define hpage_nr_pages(x) 1
157 #define transparent_hugepage_enabled(__vma) 0
159 #define transparent_hugepage_flags 0UL
161 split_huge_page_to_list(struct page *page, struct list_head *list)
165 static inline int split_huge_page(struct page *page)
169 static inline void deferred_split_huge_page(struct page *page) {}
170 #define split_huge_pmd(__vma, __pmd, __address) \
173 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
174 unsigned long address, bool freeze, struct page *page) {}
176 static inline int hugepage_madvise(struct vm_area_struct *vma,
177 unsigned long *vm_flags, int advice)
182 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
188 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
189 struct vm_area_struct *vma)
194 static inline int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd)
199 static inline bool is_huge_zero_page(struct page *page)
204 static inline void put_huge_zero_page(void)
209 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
210 unsigned long addr, pmd_t *pmd, int flags)
214 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
216 #endif /* _LINUX_HUGE_MM_H */