[CONNECTOR]: Update documentation to match reality.
[linux-2.6/verdex.git] / include / linux / hugetlb.h
blobe670b0d13fe02af741f0f881058bcfb0d43639df
1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #ifdef CONFIG_HUGETLB_PAGE
6 #include <linux/mempolicy.h>
7 #include <asm/tlbflush.h>
9 struct ctl_table;
11 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
13 return vma->vm_flags & VM_HUGETLB;
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 *);
29 extern unsigned long max_huge_pages;
30 extern const unsigned long hugetlb_zero, hugetlb_infinity;
31 extern int sysctl_hugetlb_shm_group;
33 /* arch callbacks */
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);
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
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
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
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
73 #else /* !CONFIG_HUGETLB_PAGE */
75 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
77 return 0;
79 static inline unsigned long hugetlb_total_pages(void)
81 return 0;
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(); })
103 #ifndef HPAGE_MASK
104 #define HPAGE_MASK 0 /* Keep the compiler happy */
105 #define HPAGE_SIZE 0
106 #endif
108 #endif /* !CONFIG_HUGETLB_PAGE */
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;
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;
128 struct hugetlbfs_inode_info {
129 struct shared_policy policy;
130 struct inode vfs_inode;
133 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
135 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
138 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
140 return sb->s_fs_info;
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);
149 static inline int is_file_hugepages(struct file *file)
151 return file->f_op == &hugetlbfs_file_operations;
154 static inline void set_file_hugepages(struct file *file)
156 file->f_op = &hugetlbfs_file_operations;
158 #else /* !CONFIG_HUGETLBFS */
160 #define is_file_hugepages(file) 0
161 #define set_file_hugepages(file) BUG()
162 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
164 #endif /* !CONFIG_HUGETLBFS */
166 #endif /* _LINUX_HUGETLB_H */