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 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 unsigned long hugetlb_total_pages(void);
25 int hugetlb_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
26 unsigned long address
, int write_access
);
27 int hugetlb_reserve_pages(struct inode
*inode
, long from
, long to
);
28 void hugetlb_unreserve_pages(struct inode
*inode
, long offset
, long freed
);
30 extern unsigned long max_huge_pages
;
31 extern const unsigned long hugetlb_zero
, hugetlb_infinity
;
32 extern int sysctl_hugetlb_shm_group
;
36 pte_t
*huge_pte_alloc(struct mm_struct
*mm
, unsigned long addr
);
37 pte_t
*huge_pte_offset(struct mm_struct
*mm
, unsigned long addr
);
38 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
40 struct page
*follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
41 pmd_t
*pmd
, int write
);
42 int pmd_huge(pmd_t pmd
);
43 void hugetlb_change_protection(struct vm_area_struct
*vma
,
44 unsigned long address
, unsigned long end
, pgprot_t newprot
);
46 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
47 #define is_hugepage_only_range(mm, addr, len) 0
50 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
51 #define hugetlb_free_pgd_range free_pgd_range
53 void hugetlb_free_pgd_range(struct mmu_gather
**tlb
, unsigned long addr
,
54 unsigned long end
, unsigned long floor
,
55 unsigned long ceiling
);
58 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
60 * If the arch doesn't supply something else, assume that hugepage
61 * size aligned regions are ok without further preparation.
63 static inline int prepare_hugepage_range(unsigned long addr
, unsigned long len
,
66 if (pgoff
& (~HPAGE_MASK
>> PAGE_SHIFT
))
68 if (len
& ~HPAGE_MASK
)
70 if (addr
& ~HPAGE_MASK
)
75 int prepare_hugepage_range(unsigned long addr
, unsigned long len
,
79 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
80 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
81 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
83 void set_huge_pte_at(struct mm_struct
*mm
, unsigned long addr
,
84 pte_t
*ptep
, pte_t pte
);
85 pte_t
huge_ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
89 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
90 #define hugetlb_prefault_arch_hook(mm) do { } while (0)
92 void hugetlb_prefault_arch_hook(struct mm_struct
*mm
);
95 #else /* !CONFIG_HUGETLB_PAGE */
97 static inline int is_vm_hugetlb_page(struct vm_area_struct
*vma
)
101 static inline unsigned long hugetlb_total_pages(void)
106 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
107 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
108 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
109 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
110 #define unmap_hugepage_range(vma, start, end) BUG()
111 #define hugetlb_report_meminfo(buf) 0
112 #define hugetlb_report_node_meminfo(n, buf) 0
113 #define follow_huge_pmd(mm, addr, pmd, write) NULL
114 #define prepare_hugepage_range(addr,len,pgoff) (-EINVAL)
115 #define pmd_huge(x) 0
116 #define is_hugepage_only_range(mm, addr, len) 0
117 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
118 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
120 #define hugetlb_change_protection(vma, address, end, newprot)
123 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
124 #define HPAGE_SIZE PAGE_SIZE
127 #endif /* !CONFIG_HUGETLB_PAGE */
129 #ifdef CONFIG_HUGETLBFS
130 struct hugetlbfs_config
{
138 struct hugetlbfs_sb_info
{
139 long max_blocks
; /* blocks allowed */
140 long free_blocks
; /* blocks free */
141 long max_inodes
; /* inodes allowed */
142 long free_inodes
; /* inodes free */
143 spinlock_t stat_lock
;
147 struct hugetlbfs_inode_info
{
148 struct shared_policy policy
;
149 struct inode vfs_inode
;
152 static inline struct hugetlbfs_inode_info
*HUGETLBFS_I(struct inode
*inode
)
154 return container_of(inode
, struct hugetlbfs_inode_info
, vfs_inode
);
157 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
159 return sb
->s_fs_info
;
162 extern const struct file_operations hugetlbfs_file_operations
;
163 extern struct vm_operations_struct hugetlb_vm_ops
;
164 struct file
*hugetlb_zero_setup(size_t);
165 int hugetlb_get_quota(struct address_space
*mapping
);
166 void hugetlb_put_quota(struct address_space
*mapping
);
168 static inline int is_file_hugepages(struct file
*file
)
170 return file
->f_op
== &hugetlbfs_file_operations
;
173 static inline void set_file_hugepages(struct file
*file
)
175 file
->f_op
= &hugetlbfs_file_operations
;
177 #else /* !CONFIG_HUGETLBFS */
179 #define is_file_hugepages(file) 0
180 #define set_file_hugepages(file) BUG()
181 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
183 #endif /* !CONFIG_HUGETLBFS */
185 #endif /* _LINUX_HUGETLB_H */