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>
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 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 unsigned long hugetlb_total_pages(void);
24 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
25 unsigned long address, int write_access);
27 extern unsigned long max_huge_pages;
28 extern const unsigned long hugetlb_zero, hugetlb_infinity;
29 extern int sysctl_hugetlb_shm_group;
33 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
34 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
35 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
37 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
38 pmd_t *pmd, int write);
39 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
40 int pmd_huge(pmd_t pmd);
41 void hugetlb_change_protection(struct vm_area_struct *vma,
42 unsigned long address, unsigned long end, pgprot_t newprot);
44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
45 #define is_hugepage_only_range(mm, addr, len) 0
48 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
49 #define hugetlb_free_pgd_range free_pgd_range
51 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
52 unsigned long end, unsigned long floor,
53 unsigned long ceiling);
56 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
57 #define prepare_hugepage_range(addr, len) \
58 is_aligned_hugepage_range(addr, len)
60 int prepare_hugepage_range(unsigned long addr, unsigned long len);
63 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
64 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
65 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
67 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
68 pte_t *ptep, pte_t pte);
69 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
73 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
74 #define hugetlb_prefault_arch_hook(mm) do { } while (0)
76 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
79 #else /* !CONFIG_HUGETLB_PAGE */
81 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
85 static inline unsigned long hugetlb_total_pages(void)
90 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
91 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
92 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
93 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
94 #define unmap_hugepage_range(vma, start, end) BUG()
95 #define hugetlb_report_meminfo(buf) 0
96 #define hugetlb_report_node_meminfo(n, buf) 0
97 #define follow_huge_pmd(mm, addr, pmd, write) NULL
98 #define is_aligned_hugepage_range(addr, len) 0
99 #define prepare_hugepage_range(addr, len) (-EINVAL)
100 #define pmd_huge(x) 0
101 #define is_hugepage_only_range(mm, addr, len) 0
102 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
103 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
105 #define hugetlb_change_protection(vma, address, end, newprot)
108 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
109 #define HPAGE_SIZE PAGE_SIZE
112 #endif /* !CONFIG_HUGETLB_PAGE */
114 #ifdef CONFIG_HUGETLBFS
115 struct hugetlbfs_config {
123 struct hugetlbfs_sb_info {
124 long max_blocks; /* blocks allowed */
125 long free_blocks; /* blocks free */
126 long max_inodes; /* inodes allowed */
127 long free_inodes; /* inodes free */
128 spinlock_t stat_lock;
132 struct hugetlbfs_inode_info {
133 struct shared_policy policy;
134 /* Protected by the (global) hugetlb_lock */
135 unsigned long prereserved_hpages;
136 struct inode vfs_inode;
139 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
141 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
144 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
146 return sb->s_fs_info;
149 extern struct file_operations hugetlbfs_file_operations;
150 extern struct vm_operations_struct hugetlb_vm_ops;
151 struct file *hugetlb_zero_setup(size_t);
152 int hugetlb_extend_reservation(struct hugetlbfs_inode_info *info,
153 unsigned long atleast_hpages);
154 void hugetlb_truncate_reservation(struct hugetlbfs_inode_info *info,
155 unsigned long atmost_hpages);
156 int hugetlb_get_quota(struct address_space *mapping);
157 void hugetlb_put_quota(struct address_space *mapping);
159 static inline int is_file_hugepages(struct file *file)
161 return file->f_op == &hugetlbfs_file_operations;
164 static inline void set_file_hugepages(struct file *file)
166 file->f_op = &hugetlbfs_file_operations;
168 #else /* !CONFIG_HUGETLBFS */
170 #define is_file_hugepages(file) 0
171 #define set_file_hugepages(file) BUG()
172 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
174 #endif /* !CONFIG_HUGETLBFS */
176 #endif /* _LINUX_HUGETLB_H */