1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #ifdef CONFIG_HUGETLB_PAGE
6 #include <linux/mempolicy.h>
10 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
12 return vma->vm_flags & VM_HUGETLB;
15 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *);
16 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
17 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
18 void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
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 int is_hugepage_mem_enough(size_t);
24 unsigned long hugetlb_total_pages(void);
25 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
27 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
28 pmd_t *pmd, int write);
29 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
30 int pmd_huge(pmd_t pmd);
31 struct page *alloc_huge_page(void);
32 void free_huge_page(struct page *);
34 extern unsigned long max_huge_pages;
35 extern const unsigned long hugetlb_zero, hugetlb_infinity;
37 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
38 #define is_hugepage_only_range(addr, len) 0
39 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
42 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
43 #define prepare_hugepage_range(addr, len) \
44 is_aligned_hugepage_range(addr, len)
46 int prepare_hugepage_range(unsigned long addr, unsigned long len);
49 #else /* !CONFIG_HUGETLB_PAGE */
51 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
55 static inline unsigned long hugetlb_total_pages(void)
60 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
61 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
62 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
63 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
64 #define zap_hugepage_range(vma, start, len) BUG()
65 #define unmap_hugepage_range(vma, start, end) BUG()
66 #define is_hugepage_mem_enough(size) 0
67 #define hugetlb_report_meminfo(buf) 0
68 #define hugetlb_report_node_meminfo(n, buf) 0
69 #define follow_huge_pmd(mm, addr, pmd, write) NULL
70 #define is_aligned_hugepage_range(addr, len) 0
71 #define prepare_hugepage_range(addr, len) (-EINVAL)
73 #define is_hugepage_only_range(addr, len) 0
74 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
75 #define alloc_huge_page() ({ NULL; })
76 #define free_huge_page(p) ({ (void)(p); BUG(); })
79 #define HPAGE_MASK 0 /* Keep the compiler happy */
83 #endif /* !CONFIG_HUGETLB_PAGE */
85 #ifdef CONFIG_HUGETLBFS
86 struct hugetlbfs_config {
94 struct hugetlbfs_sb_info {
95 long max_blocks; /* blocks allowed */
96 long free_blocks; /* blocks free */
97 long max_inodes; /* inodes allowed */
98 long free_inodes; /* inodes free */
103 struct hugetlbfs_inode_info {
104 struct shared_policy policy;
105 struct inode vfs_inode;
108 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
110 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
113 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
115 return sb->s_fs_info;
118 extern struct file_operations hugetlbfs_file_operations;
119 extern struct vm_operations_struct hugetlb_vm_ops;
120 struct file *hugetlb_zero_setup(size_t);
121 int hugetlb_get_quota(struct address_space *mapping);
122 void hugetlb_put_quota(struct address_space *mapping);
124 static inline int is_file_hugepages(struct file *file)
126 return file->f_op == &hugetlbfs_file_operations;
129 static inline void set_file_hugepages(struct file *file)
131 file->f_op = &hugetlbfs_file_operations;
133 #else /* !CONFIG_HUGETLBFS */
135 #define is_file_hugepages(file) 0
136 #define set_file_hugepages(file) BUG()
137 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
139 #endif /* !CONFIG_HUGETLBFS */
141 #endif /* _LINUX_HUGETLB_H */