Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
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);
22extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
24 unsigned char *vec);
25extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, pgprot_t newprot);
27
28enum 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,
36#endif
37};
38
39enum 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,
43};
44extern pmd_t *page_check_address_pmd(struct page *page,
45 struct mm_struct *mm,
46 unsigned long address,
47 enum page_check_address_pmd_flag flag);
48
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
53
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 !is_vma_temporary_stack(__vma))
62#define transparent_hugepage_defrag(__vma) \
63 ((transparent_hugepage_flags & \
64 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
65 (transparent_hugepage_flags & \
66 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
67 (__vma)->vm_flags & VM_HUGEPAGE))
68#ifdef CONFIG_DEBUG_VM
69#define transparent_hugepage_debug_cow() \
70 (transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
72#else /* CONFIG_DEBUG_VM */
73#define transparent_hugepage_debug_cow() 0
74#endif /* CONFIG_DEBUG_VM */
75
76extern unsigned long transparent_hugepage_flags;
77extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
78 pmd_t *dst_pmd, pmd_t *src_pmd,
79 struct vm_area_struct *vma,
80 unsigned long addr, unsigned long end);
81extern int handle_pte_fault(struct mm_struct *mm,
82 struct vm_area_struct *vma, unsigned long address,
83 pte_t *pte, pmd_t *pmd, unsigned int flags);
84extern int split_huge_page(struct page *page);
85extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
86#define split_huge_page_pmd(__mm, __pmd) \
87 do { \
88 pmd_t *____pmd = (__pmd); \
89 if (unlikely(pmd_trans_huge(*____pmd))) \
90 __split_huge_page_pmd(__mm, ____pmd); \
91 } while (0)
92#define wait_split_huge_page(__anon_vma, __pmd) \
93 do { \
94 pmd_t *____pmd = (__pmd); \
95 anon_vma_lock(__anon_vma); \
96 anon_vma_unlock(__anon_vma); \
97 BUG_ON(pmd_trans_splitting(*____pmd) || \
98 pmd_trans_huge(*____pmd)); \
99 } while (0)
100#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
101#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
102#if HPAGE_PMD_ORDER > MAX_ORDER
103#error "hugepages can't be allocated by the buddy allocator"
104#endif
105extern int hugepage_madvise(struct vm_area_struct *vma,
106 unsigned long *vm_flags, int advice);
107extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
108 unsigned long start,
109 unsigned long end,
110 long adjust_next);
111static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
112 unsigned long start,
113 unsigned long end,
114 long adjust_next)
115{
116 if (!vma->anon_vma || vma->vm_ops)
117 return;
118 __vma_adjust_trans_huge(vma, start, end, adjust_next);
119}
120static inline int hpage_nr_pages(struct page *page)
121{
122 if (unlikely(PageTransHuge(page)))
123 return HPAGE_PMD_NR;
124 return 1;
125}
126static inline struct page *compound_trans_head(struct page *page)
127{
128 if (PageTail(page)) {
129 struct page *head;
130 head = page->first_page;
131 smp_rmb();
132 /*
133 * head may be a dangling pointer.
134 * __split_huge_page_refcount clears PageTail before
135 * overwriting first_page, so if PageTail is still
136 * there it means the head pointer isn't dangling.
137 */
138 if (PageTail(page))
139 return head;
140 }
141 return page;
142}
143#else /* CONFIG_TRANSPARENT_HUGEPAGE */
144#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
145#define HPAGE_PMD_MASK ({ BUG(); 0; })
146#define HPAGE_PMD_SIZE ({ BUG(); 0; })
147
148#define hpage_nr_pages(x) 1
149
150#define transparent_hugepage_enabled(__vma) 0
151
152#define transparent_hugepage_flags 0UL
153static inline int split_huge_page(struct page *page)
154{
155 return 0;
156}
157#define split_huge_page_pmd(__mm, __pmd) \
158 do { } while (0)
159#define wait_split_huge_page(__anon_vma, __pmd) \
160 do { } while (0)
161#define compound_trans_head(page) compound_head(page)
162static inline int hugepage_madvise(struct vm_area_struct *vma,
163 unsigned long *vm_flags, int advice)
164{
165 BUG();
166 return 0;
167}
168static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
169 unsigned long start,
170 unsigned long end,
171 long adjust_next)
172{
173}
174#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
175
176#endif /* _LINUX_HUGE_MM_H */