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gerrit-public.fairphone.software / kernel / msm-4.9 / ba76149f47d8c939efa0acc07a191237af900471 / . / include / linux / huge_mm.h
blob: 43a694ef8904f3fabd8ffb26159a9bd569dbb239 [file] [log] [blame]
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800[diff] [blame]1#ifndef _LINUX_HUGE_MM_H
2#define _LINUX_HUGE_MM_H
3
4extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
5 struct vm_area_struct *vma,
6 unsigned long address, pmd_t *pmd,
7 unsigned int flags);
8extern 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);
11extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
12 unsigned long address, pmd_t *pmd,
13 pmd_t orig_pmd);
14extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
15extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
16 unsigned long addr,
17 pmd_t *pmd,
18 unsigned int flags);
19extern int zap_huge_pmd(struct mmu_gather *tlb,
20 struct vm_area_struct *vma,
21 pmd_t *pmd);
22
23enum transparent_hugepage_flag {
24 TRANSPARENT_HUGEPAGE_FLAG,
25 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
26 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
27 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame^]28 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800[diff] [blame]29#ifdef CONFIG_DEBUG_VM
30 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
31#endif
32};
33
34enum page_check_address_pmd_flag {
35 PAGE_CHECK_ADDRESS_PMD_FLAG,
36 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
37 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
38};
39extern pmd_t *page_check_address_pmd(struct page *page,
40 struct mm_struct *mm,
41 unsigned long address,
42 enum page_check_address_pmd_flag flag);
43
44#ifdef CONFIG_TRANSPARENT_HUGEPAGE
45#define HPAGE_PMD_SHIFT HPAGE_SHIFT
46#define HPAGE_PMD_MASK HPAGE_MASK
47#define HPAGE_PMD_SIZE HPAGE_SIZE
48
49#define transparent_hugepage_enabled(__vma) \
50 (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
51 (transparent_hugepage_flags & \
52 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
53 (__vma)->vm_flags & VM_HUGEPAGE))
54#define transparent_hugepage_defrag(__vma) \
55 ((transparent_hugepage_flags & \
56 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
57 (transparent_hugepage_flags & \
58 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
59 (__vma)->vm_flags & VM_HUGEPAGE))
60#ifdef CONFIG_DEBUG_VM
61#define transparent_hugepage_debug_cow() \
62 (transparent_hugepage_flags & \
63 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
64#else /* CONFIG_DEBUG_VM */
65#define transparent_hugepage_debug_cow() 0
66#endif /* CONFIG_DEBUG_VM */
67
68extern unsigned long transparent_hugepage_flags;
69extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
70 pmd_t *dst_pmd, pmd_t *src_pmd,
71 struct vm_area_struct *vma,
72 unsigned long addr, unsigned long end);
73extern int handle_pte_fault(struct mm_struct *mm,
74 struct vm_area_struct *vma, unsigned long address,
75 pte_t *pte, pmd_t *pmd, unsigned int flags);
76extern int split_huge_page(struct page *page);
77extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
78#define split_huge_page_pmd(__mm, __pmd) \
79 do { \
80 pmd_t *____pmd = (__pmd); \
81 if (unlikely(pmd_trans_huge(*____pmd))) \
82 __split_huge_page_pmd(__mm, ____pmd); \
83 } while (0)
84#define wait_split_huge_page(__anon_vma, __pmd) \
85 do { \
86 pmd_t *____pmd = (__pmd); \
87 spin_unlock_wait(&(__anon_vma)->root->lock); \
88 /* \
89 * spin_unlock_wait() is just a loop in C and so the \
90 * CPU can reorder anything around it. \
91 */ \
92 smp_mb(); \
93 BUG_ON(pmd_trans_splitting(*____pmd) || \
94 pmd_trans_huge(*____pmd)); \
95 } while (0)
96#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
97#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
98#if HPAGE_PMD_ORDER > MAX_ORDER
99#error "hugepages can't be allocated by the buddy allocator"
100#endif
Andrea Arcangeli0af4e982011-01-13 15:46:55 -0800[diff] [blame]101extern int hugepage_madvise(unsigned long *vm_flags);
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800[diff] [blame]102#else /* CONFIG_TRANSPARENT_HUGEPAGE */
103#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
104#define HPAGE_PMD_MASK ({ BUG(); 0; })
105#define HPAGE_PMD_SIZE ({ BUG(); 0; })
106
107#define transparent_hugepage_enabled(__vma) 0
108
109#define transparent_hugepage_flags 0UL
110static inline int split_huge_page(struct page *page)
111{
112 return 0;
113}
114#define split_huge_page_pmd(__mm, __pmd) \
115 do { } while (0)
116#define wait_split_huge_page(__anon_vma, __pmd) \
117 do { } while (0)
Andrea Arcangeli0af4e982011-01-13 15:46:55 -0800[diff] [blame]118static inline int hugepage_madvise(unsigned long *vm_flags)
119{
120 BUG();
121 return 0;
122}
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800[diff] [blame]123#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
124
125#endif /* _LINUX_HUGE_MM_H */