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,
22 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
25 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, pgprot_t newprot);
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,
33 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
34 #ifdef CONFIG_DEBUG_VM
35 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
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,
44 extern pmd_t *page_check_address_pmd(struct page *page,
46 unsigned long address,
47 enum page_check_address_pmd_flag flag);
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
54 #define transparent_hugepage_enabled(__vma) \
55 (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
56 (transparent_hugepage_flags & \
57 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
58 (__vma)->vm_flags & VM_HUGEPAGE))
59 #define transparent_hugepage_defrag(__vma) \
60 ((transparent_hugepage_flags & \
61 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
62 (transparent_hugepage_flags & \
63 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
64 (__vma)->vm_flags & VM_HUGEPAGE))
65 #ifdef CONFIG_DEBUG_VM
66 #define transparent_hugepage_debug_cow() \
67 (transparent_hugepage_flags & \
68 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
69 #else /* CONFIG_DEBUG_VM */
70 #define transparent_hugepage_debug_cow() 0
71 #endif /* CONFIG_DEBUG_VM */
73 extern unsigned long transparent_hugepage_flags;
74 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
75 pmd_t *dst_pmd, pmd_t *src_pmd,
76 struct vm_area_struct *vma,
77 unsigned long addr, unsigned long end);
78 extern int handle_pte_fault(struct mm_struct *mm,
79 struct vm_area_struct *vma, unsigned long address,
80 pte_t *pte, pmd_t *pmd, unsigned int flags);
81 extern int split_huge_page(struct page *page);
82 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
83 #define split_huge_page_pmd(__mm, __pmd) \
85 pmd_t *____pmd = (__pmd); \
86 if (unlikely(pmd_trans_huge(*____pmd))) \
87 __split_huge_page_pmd(__mm, ____pmd); \
89 #define wait_split_huge_page(__anon_vma, __pmd) \
91 pmd_t *____pmd = (__pmd); \
92 spin_unlock_wait(&(__anon_vma)->root->lock); \
94 * spin_unlock_wait() is just a loop in C and so the \
95 * CPU can reorder anything around it. \
98 BUG_ON(pmd_trans_splitting(*____pmd) || \
99 pmd_trans_huge(*____pmd)); \
101 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
102 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
103 #if HPAGE_PMD_ORDER > MAX_ORDER
104 #error "hugepages can't be allocated by the buddy allocator"
106 extern int hugepage_madvise(unsigned long *vm_flags);
107 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
108 #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
109 #define HPAGE_PMD_MASK ({ BUG(); 0; })
110 #define HPAGE_PMD_SIZE ({ BUG(); 0; })
112 #define transparent_hugepage_enabled(__vma) 0
114 #define transparent_hugepage_flags 0UL
115 static inline int split_huge_page(struct page *page)
119 #define split_huge_page_pmd(__mm, __pmd) \
121 #define wait_split_huge_page(__anon_vma, __pmd) \
123 static inline int hugepage_madvise(unsigned long *vm_flags)
128 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
130 #endif /* _LINUX_HUGE_MM_H */