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 & \
56 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
57 (transparent_hugepage_flags & \
58 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
59 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
60 !((__vma)->vm_flags & VM_NOHUGEPAGE))
61 #define transparent_hugepage_defrag(__vma) \
62 ((transparent_hugepage_flags & \
63 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
64 (transparent_hugepage_flags & \
65 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
66 (__vma)->vm_flags & VM_HUGEPAGE))
67 #ifdef CONFIG_DEBUG_VM
68 #define transparent_hugepage_debug_cow() \
69 (transparent_hugepage_flags & \
70 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
71 #else /* CONFIG_DEBUG_VM */
72 #define transparent_hugepage_debug_cow() 0
73 #endif /* CONFIG_DEBUG_VM */
75 extern unsigned long transparent_hugepage_flags
;
76 extern int copy_pte_range(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
77 pmd_t
*dst_pmd
, pmd_t
*src_pmd
,
78 struct vm_area_struct
*vma
,
79 unsigned long addr
, unsigned long end
);
80 extern int handle_pte_fault(struct mm_struct
*mm
,
81 struct vm_area_struct
*vma
, unsigned long address
,
82 pte_t
*pte
, pmd_t
*pmd
, unsigned int flags
);
83 extern int split_huge_page(struct page
*page
);
84 extern void __split_huge_page_pmd(struct mm_struct
*mm
, pmd_t
*pmd
);
85 #define split_huge_page_pmd(__mm, __pmd) \
87 pmd_t *____pmd = (__pmd); \
88 if (unlikely(pmd_trans_huge(*____pmd))) \
89 __split_huge_page_pmd(__mm, ____pmd); \
91 #define wait_split_huge_page(__anon_vma, __pmd) \
93 pmd_t *____pmd = (__pmd); \
94 spin_unlock_wait(&(__anon_vma)->root->lock); \
96 * spin_unlock_wait() is just a loop in C and so the \
97 * CPU can reorder anything around it. \
100 BUG_ON(pmd_trans_splitting(*____pmd) || \
101 pmd_trans_huge(*____pmd)); \
103 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
104 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
105 #if HPAGE_PMD_ORDER > MAX_ORDER
106 #error "hugepages can't be allocated by the buddy allocator"
108 extern int hugepage_madvise(struct vm_area_struct
*vma
,
109 unsigned long *vm_flags
, int advice
);
110 extern void __vma_adjust_trans_huge(struct vm_area_struct
*vma
,
114 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
119 if (!vma
->anon_vma
|| vma
->vm_ops
|| vma
->vm_file
)
121 __vma_adjust_trans_huge(vma
, start
, end
, adjust_next
);
123 static inline int hpage_nr_pages(struct page
*page
)
125 if (unlikely(PageTransHuge(page
)))
129 static inline struct page
*compound_trans_head(struct page
*page
)
131 if (PageTail(page
)) {
133 head
= page
->first_page
;
136 * head may be a dangling pointer.
137 * __split_huge_page_refcount clears PageTail before
138 * overwriting first_page, so if PageTail is still
139 * there it means the head pointer isn't dangling.
146 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
147 #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
148 #define HPAGE_PMD_MASK ({ BUG(); 0; })
149 #define HPAGE_PMD_SIZE ({ BUG(); 0; })
151 #define hpage_nr_pages(x) 1
153 #define transparent_hugepage_enabled(__vma) 0
155 #define transparent_hugepage_flags 0UL
156 static inline int split_huge_page(struct page
*page
)
160 #define split_huge_page_pmd(__mm, __pmd) \
162 #define wait_split_huge_page(__anon_vma, __pmd) \
164 #define compound_trans_head(page) compound_head(page)
165 static inline int hugepage_madvise(struct vm_area_struct
*vma
,
166 unsigned long *vm_flags
, int advice
)
171 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
177 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
179 #endif /* _LINUX_HUGE_MM_H */