[PATCH] remove hugetlb_clean_stale_pgtable() and fix huge_pte_alloc()
[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 zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
20 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
21 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
22 int hugetlb_report_meminfo(char *);
23 int hugetlb_report_node_meminfo(int, char *);
24 int is_hugepage_mem_enough(size_t);
25 unsigned long hugetlb_total_pages(void);
26 struct page *alloc_huge_page(void);
27 void free_huge_page(struct page *);
28
29 extern unsigned long max_huge_pages;
30 extern const unsigned long hugetlb_zero, hugetlb_infinity;
31 extern int sysctl_hugetlb_shm_group;
32
33 /* arch callbacks */
34
35 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
36 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
37 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
38                               int write);
39 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
40                                 pmd_t *pmd, int write);
41 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
42 int pmd_huge(pmd_t pmd);
43
44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
45 #define is_hugepage_only_range(mm, addr, len)   0
46 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
47                                                 do { } while (0)
48 #endif
49
50 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
51 #define prepare_hugepage_range(addr, len)       \
52         is_aligned_hugepage_range(addr, len)
53 #else
54 int prepare_hugepage_range(unsigned long addr, unsigned long len);
55 #endif
56
57 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
58 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
59 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
60 #else
61 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
62                      pte_t *ptep, pte_t pte);
63 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
64                               pte_t *ptep);
65 #endif
66
67 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
68 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
69 #else
70 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
71 #endif
72
73 #else /* !CONFIG_HUGETLB_PAGE */
74
75 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
76 {
77         return 0;
78 }
79 static inline unsigned long hugetlb_total_pages(void)
80 {
81         return 0;
82 }
83
84 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
85 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
86 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
87 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
88 #define zap_hugepage_range(vma, start, len)     BUG()
89 #define unmap_hugepage_range(vma, start, end)   BUG()
90 #define is_hugepage_mem_enough(size)            0
91 #define hugetlb_report_meminfo(buf)             0
92 #define hugetlb_report_node_meminfo(n, buf)     0
93 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
94 #define is_aligned_hugepage_range(addr, len)    0
95 #define prepare_hugepage_range(addr, len)       (-EINVAL)
96 #define pmd_huge(x)     0
97 #define is_hugepage_only_range(mm, addr, len)   0
98 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
99                                                 do { } while (0)
100 #define alloc_huge_page()                       ({ NULL; })
101 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
102
103 #ifndef HPAGE_MASK
104 #define HPAGE_MASK      0               /* Keep the compiler happy */
105 #define HPAGE_SIZE      0
106 #endif
107
108 #endif /* !CONFIG_HUGETLB_PAGE */
109
110 #ifdef CONFIG_HUGETLBFS
111 struct hugetlbfs_config {
112         uid_t   uid;
113         gid_t   gid;
114         umode_t mode;
115         long    nr_blocks;
116         long    nr_inodes;
117 };
118
119 struct hugetlbfs_sb_info {
120         long    max_blocks;   /* blocks allowed */
121         long    free_blocks;  /* blocks free */
122         long    max_inodes;   /* inodes allowed */
123         long    free_inodes;  /* inodes free */
124         spinlock_t      stat_lock;
125 };
126
127
128 struct hugetlbfs_inode_info {
129         struct shared_policy policy;
130         struct inode vfs_inode;
131 };
132
133 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
134 {
135         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
136 }
137
138 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
139 {
140         return sb->s_fs_info;
141 }
142
143 extern struct file_operations hugetlbfs_file_operations;
144 extern struct vm_operations_struct hugetlb_vm_ops;
145 struct file *hugetlb_zero_setup(size_t);
146 int hugetlb_get_quota(struct address_space *mapping);
147 void hugetlb_put_quota(struct address_space *mapping);
148
149 static inline int is_file_hugepages(struct file *file)
150 {
151         return file->f_op == &hugetlbfs_file_operations;
152 }
153
154 static inline void set_file_hugepages(struct file *file)
155 {
156         file->f_op = &hugetlbfs_file_operations;
157 }
158 #else /* !CONFIG_HUGETLBFS */
159
160 #define is_file_hugepages(file)         0
161 #define set_file_hugepages(file)        BUG()
162 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
163
164 #endif /* !CONFIG_HUGETLBFS */
165
166 #endif /* _LINUX_HUGETLB_H */