Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.9 / 0af4e98b6b095c74588af04872f83d333c958c32 / . / include / linux / huge_mm.h
blob: d9ab70d776e295473f146bb1a61ea7d5d50a8566 [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,
28#ifdef CONFIG_DEBUG_VM
29 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
30#endif
31};
32
33enum page_check_address_pmd_flag {
34 PAGE_CHECK_ADDRESS_PMD_FLAG,
35 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
36 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
37};
38extern pmd_t *page_check_address_pmd(struct page *page,
39 struct mm_struct *mm,
40 unsigned long address,
41 enum page_check_address_pmd_flag flag);
42
43#ifdef CONFIG_TRANSPARENT_HUGEPAGE
44#define HPAGE_PMD_SHIFT HPAGE_SHIFT
45#define HPAGE_PMD_MASK HPAGE_MASK
46#define HPAGE_PMD_SIZE HPAGE_SIZE
47
48#define transparent_hugepage_enabled(__vma) \
49 (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
50 (transparent_hugepage_flags & \
51 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
52 (__vma)->vm_flags & VM_HUGEPAGE))
53#define transparent_hugepage_defrag(__vma) \
54 ((transparent_hugepage_flags & \
55 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
56 (transparent_hugepage_flags & \
57 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
58 (__vma)->vm_flags & VM_HUGEPAGE))
59#ifdef CONFIG_DEBUG_VM
60#define transparent_hugepage_debug_cow() \
61 (transparent_hugepage_flags & \
62 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
63#else /* CONFIG_DEBUG_VM */
64#define transparent_hugepage_debug_cow() 0
65#endif /* CONFIG_DEBUG_VM */
66
67extern unsigned long transparent_hugepage_flags;
68extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
69 pmd_t *dst_pmd, pmd_t *src_pmd,
70 struct vm_area_struct *vma,
71 unsigned long addr, unsigned long end);
72extern int handle_pte_fault(struct mm_struct *mm,
73 struct vm_area_struct *vma, unsigned long address,
74 pte_t *pte, pmd_t *pmd, unsigned int flags);
75extern int split_huge_page(struct page *page);
76extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
77#define split_huge_page_pmd(__mm, __pmd) \
78 do { \
79 pmd_t *____pmd = (__pmd); \
80 if (unlikely(pmd_trans_huge(*____pmd))) \
81 __split_huge_page_pmd(__mm, ____pmd); \
82 } while (0)
83#define wait_split_huge_page(__anon_vma, __pmd) \
84 do { \
85 pmd_t *____pmd = (__pmd); \
86 spin_unlock_wait(&(__anon_vma)->root->lock); \
87 /* \
88 * spin_unlock_wait() is just a loop in C and so the \
89 * CPU can reorder anything around it. \
90 */ \
91 smp_mb(); \
92 BUG_ON(pmd_trans_splitting(*____pmd) || \
93 pmd_trans_huge(*____pmd)); \
94 } while (0)
95#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
96#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
97#if HPAGE_PMD_ORDER > MAX_ORDER
98#error "hugepages can't be allocated by the buddy allocator"
99#endif
Andrea Arcangeli0af4e982011-01-13 15:46:55 -0800[diff] [blame^]100extern int hugepage_madvise(unsigned long *vm_flags);
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800[diff] [blame]101#else /* CONFIG_TRANSPARENT_HUGEPAGE */
102#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
103#define HPAGE_PMD_MASK ({ BUG(); 0; })
104#define HPAGE_PMD_SIZE ({ BUG(); 0; })
105
106#define transparent_hugepage_enabled(__vma) 0
107
108#define transparent_hugepage_flags 0UL
109static inline int split_huge_page(struct page *page)
110{
111 return 0;
112}
113#define split_huge_page_pmd(__mm, __pmd) \
114 do { } while (0)
115#define wait_split_huge_page(__anon_vma, __pmd) \
116 do { } while (0)
Andrea Arcangeli0af4e982011-01-13 15:46:55 -0800[diff] [blame^]117static inline int hugepage_madvise(unsigned long *vm_flags)
118{
119 BUG();
120 return 0;
121}
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800[diff] [blame]122#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
123
124#endif /* _LINUX_HUGE_MM_H */