1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
5 struct vm_area_struct *vma,
6 unsigned long address, pmd_t *pmd,
8 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
9 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
10 struct vm_area_struct *vma);
11 extern void huge_pmd_set_accessed(struct mm_struct *mm,
12 struct vm_area_struct *vma,
13 unsigned long address, pmd_t *pmd,
14 pmd_t orig_pmd, int dirty);
15 extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
16 unsigned long address, pmd_t *pmd,
18 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
22 extern int zap_huge_pmd(struct mmu_gather *tlb,
23 struct vm_area_struct *vma,
24 pmd_t *pmd, unsigned long addr);
25 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, unsigned long end,
28 extern int move_huge_pmd(struct vm_area_struct *vma,
29 struct vm_area_struct *new_vma,
30 unsigned long old_addr,
31 unsigned long new_addr, unsigned long old_end,
32 pmd_t *old_pmd, pmd_t *new_pmd);
33 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
34 unsigned long addr, pgprot_t newprot,
37 enum transparent_hugepage_flag {
38 TRANSPARENT_HUGEPAGE_FLAG,
39 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
40 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
41 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
42 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
43 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
44 #ifdef CONFIG_DEBUG_VM
45 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
49 enum page_check_address_pmd_flag {
50 PAGE_CHECK_ADDRESS_PMD_FLAG,
51 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
52 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
54 extern pmd_t *page_check_address_pmd(struct page *page,
56 unsigned long address,
57 enum page_check_address_pmd_flag flag,
60 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
61 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
63 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
64 #define HPAGE_PMD_SHIFT PMD_SHIFT
65 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
66 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
68 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
70 #define transparent_hugepage_enabled(__vma) \
71 ((transparent_hugepage_flags & \
72 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
73 (transparent_hugepage_flags & \
74 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
75 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
76 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
77 !is_vma_temporary_stack(__vma))
78 #define transparent_hugepage_defrag(__vma) \
79 ((transparent_hugepage_flags & \
80 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
81 (transparent_hugepage_flags & \
82 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
83 (__vma)->vm_flags & VM_HUGEPAGE))
84 #define transparent_hugepage_use_zero_page() \
85 (transparent_hugepage_flags & \
86 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
87 #ifdef CONFIG_DEBUG_VM
88 #define transparent_hugepage_debug_cow() \
89 (transparent_hugepage_flags & \
90 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
91 #else /* CONFIG_DEBUG_VM */
92 #define transparent_hugepage_debug_cow() 0
93 #endif /* CONFIG_DEBUG_VM */
95 extern unsigned long transparent_hugepage_flags;
96 extern int split_huge_page_to_list(struct page *page, struct list_head *list);
97 static inline int split_huge_page(struct page *page)
99 return split_huge_page_to_list(page, NULL);
101 extern void __split_huge_page_pmd(struct vm_area_struct *vma,
102 unsigned long address, pmd_t *pmd);
103 #define split_huge_page_pmd(__vma, __address, __pmd) \
105 pmd_t *____pmd = (__pmd); \
106 if (unlikely(pmd_trans_huge(*____pmd))) \
107 __split_huge_page_pmd(__vma, __address, \
110 #define wait_split_huge_page(__anon_vma, __pmd) \
112 pmd_t *____pmd = (__pmd); \
113 anon_vma_lock_write(__anon_vma); \
114 anon_vma_unlock_write(__anon_vma); \
115 BUG_ON(pmd_trans_splitting(*____pmd) || \
116 pmd_trans_huge(*____pmd)); \
118 extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
120 #if HPAGE_PMD_ORDER >= MAX_ORDER
121 #error "hugepages can't be allocated by the buddy allocator"
123 extern int hugepage_madvise(struct vm_area_struct *vma,
124 unsigned long *vm_flags, int advice);
125 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
129 extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
131 /* mmap_sem must be held on entry */
132 static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
135 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
136 if (pmd_trans_huge(*pmd))
137 return __pmd_trans_huge_lock(pmd, vma, ptl);
141 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
146 if (!vma->anon_vma || vma->vm_ops)
148 __vma_adjust_trans_huge(vma, start, end, adjust_next);
150 static inline int hpage_nr_pages(struct page *page)
152 if (unlikely(PageTransHuge(page)))
157 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
158 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
160 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
161 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
162 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
163 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
165 #define hpage_nr_pages(x) 1
167 #define transparent_hugepage_enabled(__vma) 0
169 #define transparent_hugepage_flags 0UL
171 split_huge_page_to_list(struct page *page, struct list_head *list)
175 static inline int split_huge_page(struct page *page)
179 #define split_huge_page_pmd(__vma, __address, __pmd) \
181 #define wait_split_huge_page(__anon_vma, __pmd) \
183 #define split_huge_page_pmd_mm(__mm, __address, __pmd) \
185 static inline int hugepage_madvise(struct vm_area_struct *vma,
186 unsigned long *vm_flags, int advice)
191 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
197 static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
203 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
204 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
209 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
211 #endif /* _LINUX_HUGE_MM_H */