[PATCH] hugepage: Move hugetlb_free_pgd_range() prototype to hugetlb.h
[linux-2.6.git] / include / linux / hugetlb.h
1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
3
4 #ifdef CONFIG_HUGETLB_PAGE
5
6 #include <linux/mempolicy.h>
7 #include <asm/tlbflush.h>
8
9 struct ctl_table;
10
11 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
12 {
13         return vma->vm_flags & VM_HUGETLB;
14 }
15
16 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
17 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
18 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
19 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
20 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
21 int hugetlb_report_meminfo(char *);
22 int hugetlb_report_node_meminfo(int, char *);
23 unsigned long hugetlb_total_pages(void);
24 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
25                         unsigned long address, int write_access);
26
27 extern unsigned long max_huge_pages;
28 extern const unsigned long hugetlb_zero, hugetlb_infinity;
29 extern int sysctl_hugetlb_shm_group;
30
31 /* arch callbacks */
32
33 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
34 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
35 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
36                               int write);
37 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
38                                 pmd_t *pmd, int write);
39 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
40 int pmd_huge(pmd_t pmd);
41 void hugetlb_change_protection(struct vm_area_struct *vma,
42                 unsigned long address, unsigned long end, pgprot_t newprot);
43
44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
45 #define is_hugepage_only_range(mm, addr, len)   0
46 #endif
47
48 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
49 #define hugetlb_free_pgd_range  free_pgd_range
50 #else
51 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
52                             unsigned long end, unsigned long floor,
53                             unsigned long ceiling);
54 #endif
55
56 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
57 #define prepare_hugepage_range(addr, len)       \
58         is_aligned_hugepage_range(addr, len)
59 #else
60 int prepare_hugepage_range(unsigned long addr, unsigned long len);
61 #endif
62
63 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
64 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
65 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
66 #else
67 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
68                      pte_t *ptep, pte_t pte);
69 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
70                               pte_t *ptep);
71 #endif
72
73 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
74 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
75 #else
76 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
77 #endif
78
79 #else /* !CONFIG_HUGETLB_PAGE */
80
81 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
82 {
83         return 0;
84 }
85 static inline unsigned long hugetlb_total_pages(void)
86 {
87         return 0;
88 }
89
90 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
91 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
92 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
93 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
94 #define unmap_hugepage_range(vma, start, end)   BUG()
95 #define hugetlb_report_meminfo(buf)             0
96 #define hugetlb_report_node_meminfo(n, buf)     0
97 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
98 #define is_aligned_hugepage_range(addr, len)    0
99 #define prepare_hugepage_range(addr, len)       (-EINVAL)
100 #define pmd_huge(x)     0
101 #define is_hugepage_only_range(mm, addr, len)   0
102 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
103 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
104
105 #define hugetlb_change_protection(vma, address, end, newprot)
106
107 #ifndef HPAGE_MASK
108 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
109 #define HPAGE_SIZE      PAGE_SIZE
110 #endif
111
112 #endif /* !CONFIG_HUGETLB_PAGE */
113
114 #ifdef CONFIG_HUGETLBFS
115 struct hugetlbfs_config {
116         uid_t   uid;
117         gid_t   gid;
118         umode_t mode;
119         long    nr_blocks;
120         long    nr_inodes;
121 };
122
123 struct hugetlbfs_sb_info {
124         long    max_blocks;   /* blocks allowed */
125         long    free_blocks;  /* blocks free */
126         long    max_inodes;   /* inodes allowed */
127         long    free_inodes;  /* inodes free */
128         spinlock_t      stat_lock;
129 };
130
131
132 struct hugetlbfs_inode_info {
133         struct shared_policy policy;
134         /* Protected by the (global) hugetlb_lock */
135         unsigned long prereserved_hpages;
136         struct inode vfs_inode;
137 };
138
139 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
140 {
141         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
142 }
143
144 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
145 {
146         return sb->s_fs_info;
147 }
148
149 extern struct file_operations hugetlbfs_file_operations;
150 extern struct vm_operations_struct hugetlb_vm_ops;
151 struct file *hugetlb_zero_setup(size_t);
152 int hugetlb_extend_reservation(struct hugetlbfs_inode_info *info,
153                                unsigned long atleast_hpages);
154 void hugetlb_truncate_reservation(struct hugetlbfs_inode_info *info,
155                                   unsigned long atmost_hpages);
156 int hugetlb_get_quota(struct address_space *mapping);
157 void hugetlb_put_quota(struct address_space *mapping);
158
159 static inline int is_file_hugepages(struct file *file)
160 {
161         return file->f_op == &hugetlbfs_file_operations;
162 }
163
164 static inline void set_file_hugepages(struct file *file)
165 {
166         file->f_op = &hugetlbfs_file_operations;
167 }
168 #else /* !CONFIG_HUGETLBFS */
169
170 #define is_file_hugepages(file)         0
171 #define set_file_hugepages(file)        BUG()
172 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
173
174 #endif /* !CONFIG_HUGETLBFS */
175
176 #endif /* _LINUX_HUGETLB_H */