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);
36 enum transparent_hugepage_flag {
37 TRANSPARENT_HUGEPAGE_FLAG,
38 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
39 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
40 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
41 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
42 #ifdef CONFIG_DEBUG_VM
43 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
47 enum page_check_address_pmd_flag {
48 PAGE_CHECK_ADDRESS_PMD_FLAG,
49 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
50 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
52 extern pmd_t *page_check_address_pmd(struct page *page,
54 unsigned long address,
55 enum page_check_address_pmd_flag flag);
57 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
58 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
60 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
61 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
62 #define HPAGE_PMD_MASK HPAGE_MASK
63 #define HPAGE_PMD_SIZE HPAGE_SIZE
65 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
67 #define transparent_hugepage_enabled(__vma) \
68 ((transparent_hugepage_flags & \
69 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
70 (transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
72 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
73 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
74 !is_vma_temporary_stack(__vma))
75 #define transparent_hugepage_defrag(__vma) \
76 ((transparent_hugepage_flags & \
77 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
78 (transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
80 (__vma)->vm_flags & VM_HUGEPAGE))
81 #ifdef CONFIG_DEBUG_VM
82 #define transparent_hugepage_debug_cow() \
83 (transparent_hugepage_flags & \
84 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
85 #else /* CONFIG_DEBUG_VM */
86 #define transparent_hugepage_debug_cow() 0
87 #endif /* CONFIG_DEBUG_VM */
89 extern unsigned long transparent_hugepage_flags;
90 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
91 pmd_t *dst_pmd, pmd_t *src_pmd,
92 struct vm_area_struct *vma,
93 unsigned long addr, unsigned long end);
94 extern int handle_pte_fault(struct mm_struct *mm,
95 struct vm_area_struct *vma, unsigned long address,
96 pte_t *pte, pmd_t *pmd, unsigned int flags);
97 extern int split_huge_page(struct page *page);
98 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
99 #define split_huge_page_pmd(__mm, __pmd) \
101 pmd_t *____pmd = (__pmd); \
102 if (unlikely(pmd_trans_huge(*____pmd))) \
103 __split_huge_page_pmd(__mm, ____pmd); \
105 #define wait_split_huge_page(__anon_vma, __pmd) \
107 pmd_t *____pmd = (__pmd); \
108 anon_vma_lock(__anon_vma); \
109 anon_vma_unlock(__anon_vma); \
110 BUG_ON(pmd_trans_splitting(*____pmd) || \
111 pmd_trans_huge(*____pmd)); \
113 #if HPAGE_PMD_ORDER > MAX_ORDER
114 #error "hugepages can't be allocated by the buddy allocator"
116 extern int hugepage_madvise(struct vm_area_struct *vma,
117 unsigned long *vm_flags, int advice);
118 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
122 extern int __pmd_trans_huge_lock(pmd_t *pmd,
123 struct vm_area_struct *vma);
124 /* mmap_sem must be held on entry */
125 static inline int pmd_trans_huge_lock(pmd_t *pmd,
126 struct vm_area_struct *vma)
128 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
129 if (pmd_trans_huge(*pmd))
130 return __pmd_trans_huge_lock(pmd, vma);
134 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
139 if (!vma->anon_vma || vma->vm_ops)
141 __vma_adjust_trans_huge(vma, start, end, adjust_next);
143 static inline int hpage_nr_pages(struct page *page)
145 if (unlikely(PageTransHuge(page)))
149 static inline struct page *compound_trans_head(struct page *page)
151 if (PageTail(page)) {
153 head = page->first_page;
156 * head may be a dangling pointer.
157 * __split_huge_page_refcount clears PageTail before
158 * overwriting first_page, so if PageTail is still
159 * there it means the head pointer isn't dangling.
166 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
167 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
168 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
169 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
171 #define hpage_nr_pages(x) 1
173 #define transparent_hugepage_enabled(__vma) 0
175 #define transparent_hugepage_flags 0UL
176 static inline int split_huge_page(struct page *page)
180 #define split_huge_page_pmd(__mm, __pmd) \
182 #define wait_split_huge_page(__anon_vma, __pmd) \
184 #define compound_trans_head(page) compound_head(page)
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,
198 struct vm_area_struct *vma)
202 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
204 #endif /* _LINUX_HUGE_MM_H */