ARM: proc: add definition of cpu_reset for ARMv6 and ARMv7 cores
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / huge_mm.h
blob48c32ebf65a77a2c19b35fe900bc28daf3f64e86
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,
7 unsigned int flags);
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,
13 pmd_t orig_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,
16 unsigned long addr,
17 pmd_t *pmd,
18 unsigned int flags);
19 extern int zap_huge_pmd(struct mmu_gather *tlb,
20 struct vm_area_struct *vma,
21 pmd_t *pmd);
22 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
24 unsigned char *vec);
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,
36 #endif
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,
45 struct mm_struct *mm,
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 !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 */
76 extern unsigned long transparent_hugepage_flags;
77 extern 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);
81 extern 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);
84 extern int split_huge_page(struct page *page);
85 extern 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
105 extern int hugepage_madvise(struct vm_area_struct *vma,
106 unsigned long *vm_flags, int advice);
107 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
108 unsigned long start,
109 unsigned long end,
110 long adjust_next);
111 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
112 unsigned long start,
113 unsigned long end,
114 long adjust_next)
116 if (!vma->anon_vma || vma->vm_ops)
117 return;
118 __vma_adjust_trans_huge(vma, start, end, adjust_next);
120 static inline int hpage_nr_pages(struct page *page)
122 if (unlikely(PageTransHuge(page)))
123 return HPAGE_PMD_NR;
124 return 1;
126 static inline struct page *compound_trans_head(struct page *page)
128 if (PageTail(page)) {
129 struct page *head;
130 head = page->first_page;
131 smp_rmb();
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.
138 if (PageTail(page))
139 return head;
141 return page;
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; })
148 #define hpage_nr_pages(x) 1
150 #define transparent_hugepage_enabled(__vma) 0
152 #define transparent_hugepage_flags 0UL
153 static inline int split_huge_page(struct page *page)
155 return 0;
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)
162 static inline int hugepage_madvise(struct vm_area_struct *vma,
163 unsigned long *vm_flags, int advice)
165 BUG();
166 return 0;
168 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
169 unsigned long start,
170 unsigned long end,
171 long adjust_next)
174 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
176 #endif /* _LINUX_HUGE_MM_H */