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 struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
15 unsigned long addr,
16 pmd_t *pmd,
17 unsigned int flags);
18extern int zap_huge_pmd(struct mmu_gather *tlb,
19 struct vm_area_struct *vma,
20 pmd_t *pmd, unsigned long addr);
21extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
22 unsigned long addr, unsigned long end,
23 unsigned char *vec);
24extern int move_huge_pmd(struct vm_area_struct *vma,
25 struct vm_area_struct *new_vma,
26 unsigned long old_addr,
27 unsigned long new_addr, unsigned long old_end,
28 pmd_t *old_pmd, pmd_t *new_pmd);
29extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
30 unsigned long addr, pgprot_t newprot);
31
32enum transparent_hugepage_flag {
33 TRANSPARENT_HUGEPAGE_FLAG,
34 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
35 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
36 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
37 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
38#ifdef CONFIG_DEBUG_VM
39 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
40#endif
41};
42
43enum page_check_address_pmd_flag {
44 PAGE_CHECK_ADDRESS_PMD_FLAG,
45 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
46 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
47};
48extern pmd_t *page_check_address_pmd(struct page *page,
49 struct mm_struct *mm,
50 unsigned long address,
51 enum page_check_address_pmd_flag flag);
52
53#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
54#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
55
56#ifdef CONFIG_TRANSPARENT_HUGEPAGE
57#define HPAGE_PMD_SHIFT HPAGE_SHIFT
58#define HPAGE_PMD_MASK HPAGE_MASK
59#define HPAGE_PMD_SIZE HPAGE_SIZE
60
61extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
62
63#define transparent_hugepage_enabled(__vma) \
64 ((transparent_hugepage_flags & \
65 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
66 (transparent_hugepage_flags & \
67 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
68 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
69 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
70 !is_vma_temporary_stack(__vma))
71#define transparent_hugepage_defrag(__vma) \
72 ((transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
74 (transparent_hugepage_flags & \
75 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
76 (__vma)->vm_flags & VM_HUGEPAGE))
77#ifdef CONFIG_DEBUG_VM
78#define transparent_hugepage_debug_cow() \
79 (transparent_hugepage_flags & \
80 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
81#else /* CONFIG_DEBUG_VM */
82#define transparent_hugepage_debug_cow() 0
83#endif /* CONFIG_DEBUG_VM */
84
85extern unsigned long transparent_hugepage_flags;
86extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
87 pmd_t *dst_pmd, pmd_t *src_pmd,
88 struct vm_area_struct *vma,
89 unsigned long addr, unsigned long end);
90extern int handle_pte_fault(struct mm_struct *mm,
91 struct vm_area_struct *vma, unsigned long address,
92 pte_t *pte, pmd_t *pmd, unsigned int flags);
93extern int split_huge_page(struct page *page);
94extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
95#define split_huge_page_pmd(__mm, __pmd) \
96 do { \
97 pmd_t *____pmd = (__pmd); \
98 if (unlikely(pmd_trans_huge(*____pmd))) \
99 __split_huge_page_pmd(__mm, ____pmd); \
100 } while (0)
101#define wait_split_huge_page(__anon_vma, __pmd) \
102 do { \
103 pmd_t *____pmd = (__pmd); \
104 anon_vma_lock(__anon_vma); \
105 anon_vma_unlock(__anon_vma); \
106 BUG_ON(pmd_trans_splitting(*____pmd) || \
107 pmd_trans_huge(*____pmd)); \
108 } while (0)
109#if HPAGE_PMD_ORDER > MAX_ORDER
110#error "hugepages can't be allocated by the buddy allocator"
111#endif
112extern int hugepage_madvise(struct vm_area_struct *vma,
113 unsigned long *vm_flags, int advice);
114extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
115 unsigned long start,
116 unsigned long end,
117 long adjust_next);
118extern int __pmd_trans_huge_lock(pmd_t *pmd,
119 struct vm_area_struct *vma);
120/* mmap_sem must be held on entry */
121static inline int pmd_trans_huge_lock(pmd_t *pmd,
122 struct vm_area_struct *vma)
123{
124 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
125 if (pmd_trans_huge(*pmd))
126 return __pmd_trans_huge_lock(pmd, vma);
127 else
128 return 0;
129}
130static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
131 unsigned long start,
132 unsigned long end,
133 long adjust_next)
134{
135 if (!vma->anon_vma || vma->vm_ops)
136 return;
137 __vma_adjust_trans_huge(vma, start, end, adjust_next);
138}
139static inline int hpage_nr_pages(struct page *page)
140{
141 if (unlikely(PageTransHuge(page)))
142 return HPAGE_PMD_NR;
143 return 1;
144}
145static inline struct page *compound_trans_head(struct page *page)
146{
147 if (PageTail(page)) {
148 struct page *head;
149 head = page->first_page;
150 smp_rmb();
151 /*
152 * head may be a dangling pointer.
153 * __split_huge_page_refcount clears PageTail before
154 * overwriting first_page, so if PageTail is still
155 * there it means the head pointer isn't dangling.
156 */
157 if (PageTail(page))
158 return head;
159 }
160 return page;
161}
162#else /* CONFIG_TRANSPARENT_HUGEPAGE */
163#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
164#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
165#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
166
167#define hpage_nr_pages(x) 1
168
169#define transparent_hugepage_enabled(__vma) 0
170
171#define transparent_hugepage_flags 0UL
172static inline int split_huge_page(struct page *page)
173{
174 return 0;
175}
176#define split_huge_page_pmd(__mm, __pmd) \
177 do { } while (0)
178#define wait_split_huge_page(__anon_vma, __pmd) \
179 do { } while (0)
180#define compound_trans_head(page) compound_head(page)
181static inline int hugepage_madvise(struct vm_area_struct *vma,
182 unsigned long *vm_flags, int advice)
183{
184 BUG();
185 return 0;
186}
187static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
188 unsigned long start,
189 unsigned long end,
190 long adjust_next)
191{
192}
193static inline int pmd_trans_huge_lock(pmd_t *pmd,
194 struct vm_area_struct *vma)
195{
196 return 0;
197}
198#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
199
200#endif /* _LINUX_HUGE_MM_H */