1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #ifdef CONFIG_HUGETLB_PAGE
8 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
10 return vma->vm_flags & VM_HUGETLB;
13 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void *, size_t *);
14 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
15 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
16 void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
17 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
18 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
19 int hugetlb_report_meminfo(char *);
20 int is_hugepage_mem_enough(size_t);
21 unsigned long hugetlb_total_pages(void);
22 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
24 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
25 pmd_t *pmd, int write);
26 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
27 int pmd_huge(pmd_t pmd);
28 struct page *alloc_huge_page(void);
29 void free_huge_page(struct page *);
31 extern unsigned long max_huge_pages;
32 extern const unsigned long hugetlb_zero, hugetlb_infinity;
35 mark_mm_hugetlb(struct mm_struct *mm, struct vm_area_struct *vma)
37 if (is_vm_hugetlb_page(vma))
41 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
42 #define is_hugepage_only_range(addr, len) 0
43 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
46 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
47 #define prepare_hugepage_range(addr, len) \
48 is_aligned_hugepage_range(addr, len)
50 int prepare_hugepage_range(unsigned long addr, unsigned long len);
53 #else /* !CONFIG_HUGETLB_PAGE */
55 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
59 static inline unsigned long hugetlb_total_pages(void)
64 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
65 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
66 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
67 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
68 #define zap_hugepage_range(vma, start, len) BUG()
69 #define unmap_hugepage_range(vma, start, end) BUG()
70 #define is_hugepage_mem_enough(size) 0
71 #define hugetlb_report_meminfo(buf) 0
72 #define mark_mm_hugetlb(mm, vma) do { } while (0)
73 #define follow_huge_pmd(mm, addr, pmd, write) 0
74 #define is_aligned_hugepage_range(addr, len) 0
75 #define prepare_hugepage_range(addr, len) (-EINVAL)
77 #define is_hugepage_only_range(addr, len) 0
78 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
79 #define alloc_huge_page() ({ NULL; })
80 #define free_huge_page(p) ({ (void)(p); BUG(); })
83 #define HPAGE_MASK 0 /* Keep the compiler happy */
87 #endif /* !CONFIG_HUGETLB_PAGE */
89 #ifdef CONFIG_HUGETLBFS
90 struct hugetlbfs_config {
98 struct hugetlbfs_sb_info {
99 long max_blocks; /* blocks allowed */
100 long free_blocks; /* blocks free */
101 long max_inodes; /* inodes allowed */
102 long free_inodes; /* inodes free */
103 spinlock_t stat_lock;
106 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
108 return sb->s_fs_info;
111 extern struct file_operations hugetlbfs_file_operations;
112 extern struct vm_operations_struct hugetlb_vm_ops;
113 struct file *hugetlb_zero_setup(size_t);
114 int hugetlb_get_quota(struct address_space *mapping);
115 void hugetlb_put_quota(struct address_space *mapping);
117 static inline int is_file_hugepages(struct file *file)
119 return file->f_op == &hugetlbfs_file_operations;
122 static inline void set_file_hugepages(struct file *file)
124 file->f_op = &hugetlbfs_file_operations;
126 #else /* !CONFIG_HUGETLBFS */
128 #define is_file_hugepages(file) 0
129 #define set_file_hugepages(file) BUG()
130 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
132 #endif /* !CONFIG_HUGETLBFS */
134 #endif /* _LINUX_HUGETLB_H */