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 is_hugepage_mem_enough(size_t);
23 unsigned long hugetlb_total_pages(void);
24 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
26 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
27 pmd_t *pmd, int write);
28 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
29 int pmd_huge(pmd_t pmd);
30 struct page *alloc_huge_page(void);
31 void free_huge_page(struct page *);
33 extern unsigned long max_huge_pages;
34 extern const unsigned long hugetlb_zero, hugetlb_infinity;
35 extern int sysctl_hugetlb_shm_group;
38 mark_mm_hugetlb(struct mm_struct *mm, struct vm_area_struct *vma)
40 if (is_vm_hugetlb_page(vma))
44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
45 #define is_hugepage_only_range(addr, len) 0
46 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
49 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
50 #define prepare_hugepage_range(addr, len) \
51 is_aligned_hugepage_range(addr, len)
53 int prepare_hugepage_range(unsigned long addr, unsigned long len);
56 #else /* !CONFIG_HUGETLB_PAGE */
58 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
62 static inline unsigned long hugetlb_total_pages(void)
67 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
68 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
69 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
70 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
71 #define zap_hugepage_range(vma, start, len) BUG()
72 #define unmap_hugepage_range(vma, start, end) BUG()
73 #define is_hugepage_mem_enough(size) 0
74 #define hugetlb_report_meminfo(buf) 0
75 #define mark_mm_hugetlb(mm, vma) do { } while (0)
76 #define follow_huge_pmd(mm, addr, pmd, write) 0
77 #define is_aligned_hugepage_range(addr, len) 0
78 #define prepare_hugepage_range(addr, len) (-EINVAL)
80 #define is_hugepage_only_range(addr, len) 0
81 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
82 #define alloc_huge_page() ({ NULL; })
83 #define free_huge_page(p) ({ (void)(p); BUG(); })
86 #define HPAGE_MASK 0 /* Keep the compiler happy */
90 #endif /* !CONFIG_HUGETLB_PAGE */
92 #ifdef CONFIG_HUGETLBFS
93 struct hugetlbfs_config {
101 struct hugetlbfs_sb_info {
102 long max_blocks; /* blocks allowed */
103 long free_blocks; /* blocks free */
104 long max_inodes; /* inodes allowed */
105 long free_inodes; /* inodes free */
106 spinlock_t stat_lock;
110 struct hugetlbfs_inode_info {
111 struct shared_policy policy;
112 struct inode vfs_inode;
115 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
117 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
120 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
122 return sb->s_fs_info;
125 extern struct file_operations hugetlbfs_file_operations;
126 extern struct vm_operations_struct hugetlb_vm_ops;
127 struct file *hugetlb_zero_setup(size_t);
128 int hugetlb_get_quota(struct address_space *mapping);
129 void hugetlb_put_quota(struct address_space *mapping);
131 static inline int is_file_hugepages(struct file *file)
133 return file->f_op == &hugetlbfs_file_operations;
136 static inline void set_file_hugepages(struct file *file)
138 file->f_op = &hugetlbfs_file_operations;
140 #else /* !CONFIG_HUGETLBFS */
142 #define is_file_hugepages(file) 0
143 #define set_file_hugepages(file) BUG()
144 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
146 #endif /* !CONFIG_HUGETLBFS */
148 #endif /* _LINUX_HUGETLB_H */