debugfs: fix sparse warnings
[wrt350n-kernel.git] / include / linux / hugetlb.h
blobaddca4cd4f11c6d706cccfac2f4a81476ca133bb
1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/fs.h>
6 #ifdef CONFIG_HUGETLB_PAGE
8 #include <linux/mempolicy.h>
9 #include <linux/shm.h>
10 #include <asm/tlbflush.h>
12 struct ctl_table;
14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
16 return vma->vm_flags & VM_HUGETLB;
19 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
20 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
22 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
23 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
24 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
25 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
26 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
27 int hugetlb_report_meminfo(char *);
28 int hugetlb_report_node_meminfo(int, char *);
29 unsigned long hugetlb_total_pages(void);
30 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
31 unsigned long address, int write_access);
32 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
33 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
35 extern unsigned long max_huge_pages;
36 extern unsigned long sysctl_overcommit_huge_pages;
37 extern unsigned long hugepages_treat_as_movable;
38 extern const unsigned long hugetlb_zero, hugetlb_infinity;
39 extern int sysctl_hugetlb_shm_group;
41 /* arch callbacks */
43 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
44 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
45 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
46 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
47 int write);
48 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
49 pmd_t *pmd, int write);
50 int pmd_huge(pmd_t pmd);
51 void hugetlb_change_protection(struct vm_area_struct *vma,
52 unsigned long address, unsigned long end, pgprot_t newprot);
54 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
55 #define is_hugepage_only_range(mm, addr, len) 0
56 #endif
58 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
59 #define hugetlb_free_pgd_range free_pgd_range
60 #else
61 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
62 unsigned long end, unsigned long floor,
63 unsigned long ceiling);
64 #endif
66 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
68 * If the arch doesn't supply something else, assume that hugepage
69 * size aligned regions are ok without further preparation.
71 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
73 if (len & ~HPAGE_MASK)
74 return -EINVAL;
75 if (addr & ~HPAGE_MASK)
76 return -EINVAL;
77 return 0;
79 #else
80 int prepare_hugepage_range(unsigned long addr, unsigned long len);
81 #endif
83 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
84 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
85 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
86 #else
87 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
88 pte_t *ptep, pte_t pte);
89 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
90 pte_t *ptep);
91 #endif
93 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
94 #define hugetlb_prefault_arch_hook(mm) do { } while (0)
95 #else
96 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
97 #endif
99 #else /* !CONFIG_HUGETLB_PAGE */
101 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
103 return 0;
105 static inline unsigned long hugetlb_total_pages(void)
107 return 0;
110 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
111 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
112 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
113 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
114 #define unmap_hugepage_range(vma, start, end) BUG()
115 #define hugetlb_report_meminfo(buf) 0
116 #define hugetlb_report_node_meminfo(n, buf) 0
117 #define follow_huge_pmd(mm, addr, pmd, write) NULL
118 #define prepare_hugepage_range(addr,len) (-EINVAL)
119 #define pmd_huge(x) 0
120 #define is_hugepage_only_range(mm, addr, len) 0
121 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
122 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
124 #define hugetlb_change_protection(vma, address, end, newprot)
126 #ifndef HPAGE_MASK
127 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
128 #define HPAGE_SIZE PAGE_SIZE
129 #endif
131 #endif /* !CONFIG_HUGETLB_PAGE */
133 #ifdef CONFIG_HUGETLBFS
134 struct hugetlbfs_config {
135 uid_t uid;
136 gid_t gid;
137 umode_t mode;
138 long nr_blocks;
139 long nr_inodes;
142 struct hugetlbfs_sb_info {
143 long max_blocks; /* blocks allowed */
144 long free_blocks; /* blocks free */
145 long max_inodes; /* inodes allowed */
146 long free_inodes; /* inodes free */
147 spinlock_t stat_lock;
151 struct hugetlbfs_inode_info {
152 struct shared_policy policy;
153 struct inode vfs_inode;
156 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
158 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
161 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
163 return sb->s_fs_info;
166 extern const struct file_operations hugetlbfs_file_operations;
167 extern struct vm_operations_struct hugetlb_vm_ops;
168 struct file *hugetlb_file_setup(const char *name, size_t);
169 int hugetlb_get_quota(struct address_space *mapping, long delta);
170 void hugetlb_put_quota(struct address_space *mapping, long delta);
172 #define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
174 static inline int is_file_hugepages(struct file *file)
176 if (file->f_op == &hugetlbfs_file_operations)
177 return 1;
178 if (is_file_shm_hugepages(file))
179 return 1;
181 return 0;
184 static inline void set_file_hugepages(struct file *file)
186 file->f_op = &hugetlbfs_file_operations;
188 #else /* !CONFIG_HUGETLBFS */
190 #define is_file_hugepages(file) 0
191 #define set_file_hugepages(file) BUG()
192 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
194 #endif /* !CONFIG_HUGETLBFS */
196 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
197 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
198 unsigned long len, unsigned long pgoff,
199 unsigned long flags);
200 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
202 #endif /* _LINUX_HUGETLB_H */