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hugetlb: introduce generic version of set_huge_pte_at()
[linux.git] / arch / arm64 / include / asm / hugetlb.h
1 /*
2  * arch/arm64/include/asm/hugetlb.h
3  *
4  * Copyright (C) 2013 Linaro Ltd.
5  *
6  * Based on arch/x86/include/asm/hugetlb.h
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17
18 #ifndef __ASM_HUGETLB_H
19 #define __ASM_HUGETLB_H
20
21 #include <asm/page.h>
22
23 static inline pte_t huge_ptep_get(pte_t *ptep)
24 {
25         return READ_ONCE(*ptep);
26 }
27
28 static inline int is_hugepage_only_range(struct mm_struct *mm,
29                                          unsigned long addr, unsigned long len)
30 {
31         return 0;
32 }
33
34 static inline int prepare_hugepage_range(struct file *file,
35                                          unsigned long addr, unsigned long len)
36 {
37         struct hstate *h = hstate_file(file);
38         if (len & ~huge_page_mask(h))
39                 return -EINVAL;
40         if (addr & ~huge_page_mask(h))
41                 return -EINVAL;
42         return 0;
43 }
44
45 static inline int huge_pte_none(pte_t pte)
46 {
47         return pte_none(pte);
48 }
49
50 static inline pte_t huge_pte_wrprotect(pte_t pte)
51 {
52         return pte_wrprotect(pte);
53 }
54
55 static inline void arch_clear_hugepage_flags(struct page *page)
56 {
57         clear_bit(PG_dcache_clean, &page->flags);
58 }
59
60 extern pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
61                                 struct page *page, int writable);
62 #define arch_make_huge_pte arch_make_huge_pte
63 #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
64 extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
65                             pte_t *ptep, pte_t pte);
66 extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
67                                       unsigned long addr, pte_t *ptep,
68                                       pte_t pte, int dirty);
69 extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
70                                      unsigned long addr, pte_t *ptep);
71 extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
72                                     unsigned long addr, pte_t *ptep);
73 extern void huge_ptep_clear_flush(struct vm_area_struct *vma,
74                                   unsigned long addr, pte_t *ptep);
75 #define __HAVE_ARCH_HUGE_PTE_CLEAR
76 extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
77                            pte_t *ptep, unsigned long sz);
78 extern void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
79                                  pte_t *ptep, pte_t pte, unsigned long sz);
80 #define set_huge_swap_pte_at set_huge_swap_pte_at
81
82 #include <asm-generic/hugetlb.h>
83
84 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
85 static inline bool gigantic_page_supported(void) { return true; }
86 #endif
87
88 #endif /* __ASM_HUGETLB_H */