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 int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
12 unsigned long address, pmd_t *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,
19 extern int zap_huge_pmd(struct mmu_gather *tlb,
20 struct vm_area_struct *vma,
21 pmd_t *pmd, unsigned long addr);
22 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
25 extern int move_huge_pmd(struct vm_area_struct *vma,
26 struct vm_area_struct *new_vma,
27 unsigned long old_addr,
28 unsigned long new_addr, unsigned long old_end,
29 pmd_t *old_pmd, pmd_t *new_pmd);
30 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
31 unsigned long addr, pgprot_t newprot);
33 enum transparent_hugepage_flag {
34 TRANSPARENT_HUGEPAGE_FLAG,
35 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
36 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
37 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
38 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
39 #ifdef CONFIG_DEBUG_VM
40 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
44 enum page_check_address_pmd_flag {
45 PAGE_CHECK_ADDRESS_PMD_FLAG,
46 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
47 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
49 extern pmd_t *page_check_address_pmd(struct page *page,
51 unsigned long address,
52 enum page_check_address_pmd_flag flag);
54 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
55 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
57 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
58 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
59 #define HPAGE_PMD_MASK HPAGE_MASK
60 #define HPAGE_PMD_SIZE HPAGE_SIZE
62 #define transparent_hugepage_enabled(__vma) \
63 ((transparent_hugepage_flags & \
64 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
65 (transparent_hugepage_flags & \
66 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
67 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
68 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
69 !is_vma_temporary_stack(__vma))
70 #define transparent_hugepage_defrag(__vma) \
71 ((transparent_hugepage_flags & \
72 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
73 (transparent_hugepage_flags & \
74 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
75 (__vma)->vm_flags & VM_HUGEPAGE))
76 #ifdef CONFIG_DEBUG_VM
77 #define transparent_hugepage_debug_cow() \
78 (transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
80 #else /* CONFIG_DEBUG_VM */
81 #define transparent_hugepage_debug_cow() 0
82 #endif /* CONFIG_DEBUG_VM */
84 extern unsigned long transparent_hugepage_flags;
85 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
86 pmd_t *dst_pmd, pmd_t *src_pmd,
87 struct vm_area_struct *vma,
88 unsigned long addr, unsigned long end);
89 extern int handle_pte_fault(struct mm_struct *mm,
90 struct vm_area_struct *vma, unsigned long address,
91 pte_t *pte, pmd_t *pmd, unsigned int flags);
92 extern int split_huge_page(struct page *page);
93 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
94 #define split_huge_page_pmd(__mm, __pmd) \
96 pmd_t *____pmd = (__pmd); \
97 if (unlikely(pmd_trans_huge(*____pmd))) \
98 __split_huge_page_pmd(__mm, ____pmd); \
100 #define wait_split_huge_page(__anon_vma, __pmd) \
102 pmd_t *____pmd = (__pmd); \
103 anon_vma_lock(__anon_vma); \
104 anon_vma_unlock(__anon_vma); \
105 BUG_ON(pmd_trans_splitting(*____pmd) || \
106 pmd_trans_huge(*____pmd)); \
108 #if HPAGE_PMD_ORDER > MAX_ORDER
109 #error "hugepages can't be allocated by the buddy allocator"
111 extern int hugepage_madvise(struct vm_area_struct *vma,
112 unsigned long *vm_flags, int advice);
113 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
117 extern int __pmd_trans_huge_lock(pmd_t *pmd,
118 struct vm_area_struct *vma);
119 /* mmap_sem must be held on entry */
120 static inline int pmd_trans_huge_lock(pmd_t *pmd,
121 struct vm_area_struct *vma)
123 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
124 if (pmd_trans_huge(*pmd))
125 return __pmd_trans_huge_lock(pmd, vma);
129 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
134 if (!vma->anon_vma || vma->vm_ops)
136 __vma_adjust_trans_huge(vma, start, end, adjust_next);
138 static inline int hpage_nr_pages(struct page *page)
140 if (unlikely(PageTransHuge(page)))
144 static inline struct page *compound_trans_head(struct page *page)
146 if (PageTail(page)) {
148 head = page->first_page;
151 * head may be a dangling pointer.
152 * __split_huge_page_refcount clears PageTail before
153 * overwriting first_page, so if PageTail is still
154 * there it means the head pointer isn't dangling.
161 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
162 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
163 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
164 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
166 #define hpage_nr_pages(x) 1
168 #define transparent_hugepage_enabled(__vma) 0
170 #define transparent_hugepage_flags 0UL
171 static inline int split_huge_page(struct page *page)
175 #define split_huge_page_pmd(__mm, __pmd) \
177 #define wait_split_huge_page(__anon_vma, __pmd) \
179 #define compound_trans_head(page) compound_head(page)
180 static inline int hugepage_madvise(struct vm_area_struct *vma,
181 unsigned long *vm_flags, int advice)
186 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
192 static inline int pmd_trans_huge_lock(pmd_t *pmd,
193 struct vm_area_struct *vma)
197 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
199 #endif /* _LINUX_HUGE_MM_H */