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 pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
19 extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
23 extern int zap_huge_pmd(struct mmu_gather *tlb,
24 struct vm_area_struct *vma,
26 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
27 unsigned long addr, unsigned long end,
29 extern int move_huge_pmd(struct vm_area_struct *vma,
30 struct vm_area_struct *new_vma,
31 unsigned long old_addr,
32 unsigned long new_addr, unsigned long old_end,
33 pmd_t *old_pmd, pmd_t *new_pmd);
34 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
35 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 #ifdef CONFIG_DEBUG_VM
44 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
48 enum page_check_address_pmd_flag {
49 PAGE_CHECK_ADDRESS_PMD_FLAG,
50 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
51 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
53 extern pmd_t *page_check_address_pmd(struct page *page,
55 unsigned long address,
56 enum page_check_address_pmd_flag flag);
58 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
59 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
60 #define HPAGE_PMD_MASK HPAGE_MASK
61 #define HPAGE_PMD_SIZE HPAGE_SIZE
63 #define transparent_hugepage_enabled(__vma) \
64 ((transparent_hugepage_flags & \
65 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
66 (transparent_hugepage_flags & \
67 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
68 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
69 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
70 !is_vma_temporary_stack(__vma))
71 #define transparent_hugepage_defrag(__vma) \
72 ((transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
74 (transparent_hugepage_flags & \
75 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
76 (__vma)->vm_flags & VM_HUGEPAGE))
77 #ifdef CONFIG_DEBUG_VM
78 #define transparent_hugepage_debug_cow() \
79 (transparent_hugepage_flags & \
80 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
81 #else /* CONFIG_DEBUG_VM */
82 #define transparent_hugepage_debug_cow() 0
83 #endif /* CONFIG_DEBUG_VM */
85 extern unsigned long transparent_hugepage_flags;
86 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
87 pmd_t *dst_pmd, pmd_t *src_pmd,
88 struct vm_area_struct *vma,
89 unsigned long addr, unsigned long end);
90 extern int handle_pte_fault(struct mm_struct *mm,
91 struct vm_area_struct *vma, unsigned long address,
92 pte_t *pte, pmd_t *pmd, unsigned int flags);
93 extern int split_huge_page(struct page *page);
94 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
95 #define split_huge_page_pmd(__mm, __pmd) \
97 pmd_t *____pmd = (__pmd); \
98 if (unlikely(pmd_trans_huge(*____pmd))) \
99 __split_huge_page_pmd(__mm, ____pmd); \
101 #define wait_split_huge_page(__anon_vma, __pmd) \
103 pmd_t *____pmd = (__pmd); \
104 anon_vma_lock(__anon_vma); \
105 anon_vma_unlock(__anon_vma); \
106 BUG_ON(pmd_trans_splitting(*____pmd) || \
107 pmd_trans_huge(*____pmd)); \
109 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
110 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
111 #if HPAGE_PMD_ORDER > MAX_ORDER
112 #error "hugepages can't be allocated by the buddy allocator"
114 extern int hugepage_madvise(struct vm_area_struct *vma,
115 unsigned long *vm_flags, int advice);
116 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
120 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
125 if (!vma->anon_vma || vma->vm_ops)
127 __vma_adjust_trans_huge(vma, start, end, adjust_next);
129 static inline int hpage_nr_pages(struct page *page)
131 if (unlikely(PageTransHuge(page)))
135 static inline struct page *compound_trans_head(struct page *page)
137 if (PageTail(page)) {
139 head = page->first_page;
142 * head may be a dangling pointer.
143 * __split_huge_page_refcount clears PageTail before
144 * overwriting first_page, so if PageTail is still
145 * there it means the head pointer isn't dangling.
152 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
153 #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
154 #define HPAGE_PMD_MASK ({ BUG(); 0; })
155 #define HPAGE_PMD_SIZE ({ BUG(); 0; })
157 #define hpage_nr_pages(x) 1
159 #define transparent_hugepage_enabled(__vma) 0
161 #define transparent_hugepage_flags 0UL
162 static inline int split_huge_page(struct page *page)
166 #define split_huge_page_pmd(__mm, __pmd) \
168 #define wait_split_huge_page(__anon_vma, __pmd) \
170 #define compound_trans_head(page) compound_head(page)
171 static inline int hugepage_madvise(struct vm_area_struct *vma,
172 unsigned long *vm_flags, int advice)
177 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
183 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
185 #endif /* _LINUX_HUGE_MM_H */