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71e3aac0 AA |
1 | #ifndef _LINUX_HUGE_MM_H |
2 | #define _LINUX_HUGE_MM_H | |
3 | ||
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, | |
7 | unsigned int flags); | |
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 int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, | |
12 | unsigned long address, pmd_t *pmd, | |
13 | pmd_t orig_pmd); | |
14 | extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm); | |
15 | extern struct page *follow_trans_huge_pmd(struct mm_struct *mm, | |
16 | unsigned long addr, | |
17 | pmd_t *pmd, | |
18 | unsigned int flags); | |
19 | extern int zap_huge_pmd(struct mmu_gather *tlb, | |
20 | struct vm_area_struct *vma, | |
21 | pmd_t *pmd); | |
0ca1634d JW |
22 | extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
23 | unsigned long addr, unsigned long end, | |
24 | unsigned char *vec); | |
cd7548ab JW |
25 | extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
26 | unsigned long addr, pgprot_t newprot); | |
71e3aac0 AA |
27 | |
28 | enum transparent_hugepage_flag { | |
29 | TRANSPARENT_HUGEPAGE_FLAG, | |
30 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, | |
31 | TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, | |
32 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, | |
ba76149f | 33 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
71e3aac0 AA |
34 | #ifdef CONFIG_DEBUG_VM |
35 | TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, | |
36 | #endif | |
37 | }; | |
38 | ||
39 | enum page_check_address_pmd_flag { | |
40 | PAGE_CHECK_ADDRESS_PMD_FLAG, | |
41 | PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, | |
42 | PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG, | |
43 | }; | |
44 | extern pmd_t *page_check_address_pmd(struct page *page, | |
45 | struct mm_struct *mm, | |
46 | unsigned long address, | |
47 | enum page_check_address_pmd_flag flag); | |
48 | ||
49 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
50 | #define HPAGE_PMD_SHIFT HPAGE_SHIFT | |
51 | #define HPAGE_PMD_MASK HPAGE_MASK | |
52 | #define HPAGE_PMD_SIZE HPAGE_SIZE | |
53 | ||
54 | #define transparent_hugepage_enabled(__vma) \ | |
a664b2d8 AA |
55 | ((transparent_hugepage_flags & \ |
56 | (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ | |
57 | (transparent_hugepage_flags & \ | |
58 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ | |
59 | ((__vma)->vm_flags & VM_HUGEPAGE))) && \ | |
a7d6e4ec AA |
60 | !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ |
61 | !is_vma_temporary_stack(__vma)) | |
71e3aac0 AA |
62 | #define transparent_hugepage_defrag(__vma) \ |
63 | ((transparent_hugepage_flags & \ | |
64 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ | |
65 | (transparent_hugepage_flags & \ | |
66 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ | |
67 | (__vma)->vm_flags & VM_HUGEPAGE)) | |
68 | #ifdef CONFIG_DEBUG_VM | |
69 | #define transparent_hugepage_debug_cow() \ | |
70 | (transparent_hugepage_flags & \ | |
71 | (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) | |
72 | #else /* CONFIG_DEBUG_VM */ | |
73 | #define transparent_hugepage_debug_cow() 0 | |
74 | #endif /* CONFIG_DEBUG_VM */ | |
75 | ||
76 | extern unsigned long transparent_hugepage_flags; | |
77 | extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, | |
78 | pmd_t *dst_pmd, pmd_t *src_pmd, | |
79 | struct vm_area_struct *vma, | |
80 | unsigned long addr, unsigned long end); | |
81 | extern int handle_pte_fault(struct mm_struct *mm, | |
82 | struct vm_area_struct *vma, unsigned long address, | |
83 | pte_t *pte, pmd_t *pmd, unsigned int flags); | |
84 | extern int split_huge_page(struct page *page); | |
85 | extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd); | |
86 | #define split_huge_page_pmd(__mm, __pmd) \ | |
87 | do { \ | |
88 | pmd_t *____pmd = (__pmd); \ | |
89 | if (unlikely(pmd_trans_huge(*____pmd))) \ | |
90 | __split_huge_page_pmd(__mm, ____pmd); \ | |
91 | } while (0) | |
92 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
93 | do { \ | |
94 | pmd_t *____pmd = (__pmd); \ | |
2b575eb6 PZ |
95 | anon_vma_lock(__anon_vma); \ |
96 | anon_vma_unlock(__anon_vma); \ | |
71e3aac0 AA |
97 | BUG_ON(pmd_trans_splitting(*____pmd) || \ |
98 | pmd_trans_huge(*____pmd)); \ | |
99 | } while (0) | |
100 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) | |
101 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) | |
102 | #if HPAGE_PMD_ORDER > MAX_ORDER | |
103 | #error "hugepages can't be allocated by the buddy allocator" | |
104 | #endif | |
60ab3244 AA |
105 | extern int hugepage_madvise(struct vm_area_struct *vma, |
106 | unsigned long *vm_flags, int advice); | |
94fcc585 AA |
107 | extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, |
108 | unsigned long start, | |
109 | unsigned long end, | |
110 | long adjust_next); | |
111 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, | |
112 | unsigned long start, | |
113 | unsigned long end, | |
114 | long adjust_next) | |
115 | { | |
78f11a25 | 116 | if (!vma->anon_vma || vma->vm_ops) |
94fcc585 AA |
117 | return; |
118 | __vma_adjust_trans_huge(vma, start, end, adjust_next); | |
119 | } | |
2c888cfb RR |
120 | static inline int hpage_nr_pages(struct page *page) |
121 | { | |
122 | if (unlikely(PageTransHuge(page))) | |
123 | return HPAGE_PMD_NR; | |
124 | return 1; | |
125 | } | |
22e5c47e AA |
126 | static inline struct page *compound_trans_head(struct page *page) |
127 | { | |
128 | if (PageTail(page)) { | |
129 | struct page *head; | |
130 | head = page->first_page; | |
131 | smp_rmb(); | |
132 | /* | |
133 | * head may be a dangling pointer. | |
134 | * __split_huge_page_refcount clears PageTail before | |
135 | * overwriting first_page, so if PageTail is still | |
136 | * there it means the head pointer isn't dangling. | |
137 | */ | |
138 | if (PageTail(page)) | |
139 | return head; | |
140 | } | |
141 | return page; | |
142 | } | |
71e3aac0 AA |
143 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
144 | #define HPAGE_PMD_SHIFT ({ BUG(); 0; }) | |
145 | #define HPAGE_PMD_MASK ({ BUG(); 0; }) | |
146 | #define HPAGE_PMD_SIZE ({ BUG(); 0; }) | |
147 | ||
2c888cfb RR |
148 | #define hpage_nr_pages(x) 1 |
149 | ||
71e3aac0 AA |
150 | #define transparent_hugepage_enabled(__vma) 0 |
151 | ||
152 | #define transparent_hugepage_flags 0UL | |
153 | static inline int split_huge_page(struct page *page) | |
154 | { | |
155 | return 0; | |
156 | } | |
157 | #define split_huge_page_pmd(__mm, __pmd) \ | |
158 | do { } while (0) | |
159 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
160 | do { } while (0) | |
22e5c47e | 161 | #define compound_trans_head(page) compound_head(page) |
60ab3244 AA |
162 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
163 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
164 | { |
165 | BUG(); | |
166 | return 0; | |
167 | } | |
94fcc585 AA |
168 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
169 | unsigned long start, | |
170 | unsigned long end, | |
171 | long adjust_next) | |
172 | { | |
173 | } | |
71e3aac0 AA |
174 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
175 | ||
176 | #endif /* _LINUX_HUGE_MM_H */ |