Merge branch 'akpm' (patches from Andrew)
[firefly-linux-kernel-4.4.55.git] / arch / tile / include / asm / hugetlb.h
1 /*
2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
3  *
4  *   This program is free software; you can redistribute it and/or
5  *   modify it under the terms of the GNU General Public License
6  *   as published by the Free Software Foundation, version 2.
7  *
8  *   This program is distributed in the hope that it will be useful, but
9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11  *   NON INFRINGEMENT.  See the GNU General Public License for
12  *   more details.
13  */
14
15 #ifndef _ASM_TILE_HUGETLB_H
16 #define _ASM_TILE_HUGETLB_H
17
18 #include <asm/page.h>
19 #include <asm-generic/hugetlb.h>
20
21
22 static inline int is_hugepage_only_range(struct mm_struct *mm,
23                                          unsigned long addr,
24                                          unsigned long len) {
25         return 0;
26 }
27
28 /*
29  * If the arch doesn't supply something else, assume that hugepage
30  * size aligned regions are ok without further preparation.
31  */
32 static inline int prepare_hugepage_range(struct file *file,
33                                          unsigned long addr, unsigned long len)
34 {
35         struct hstate *h = hstate_file(file);
36         if (len & ~huge_page_mask(h))
37                 return -EINVAL;
38         if (addr & ~huge_page_mask(h))
39                 return -EINVAL;
40         return 0;
41 }
42
43 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
44                                           unsigned long addr, unsigned long end,
45                                           unsigned long floor,
46                                           unsigned long ceiling)
47 {
48         free_pgd_range(tlb, addr, end, floor, ceiling);
49 }
50
51 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
52                                    pte_t *ptep, pte_t pte)
53 {
54         set_pte(ptep, pte);
55 }
56
57 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
58                                             unsigned long addr, pte_t *ptep)
59 {
60         return ptep_get_and_clear(mm, addr, ptep);
61 }
62
63 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
64                                          unsigned long addr, pte_t *ptep)
65 {
66         ptep_clear_flush(vma, addr, ptep);
67 }
68
69 static inline int huge_pte_none(pte_t pte)
70 {
71         return pte_none(pte);
72 }
73
74 static inline pte_t huge_pte_wrprotect(pte_t pte)
75 {
76         return pte_wrprotect(pte);
77 }
78
79 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
80                                            unsigned long addr, pte_t *ptep)
81 {
82         ptep_set_wrprotect(mm, addr, ptep);
83 }
84
85 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
86                                              unsigned long addr, pte_t *ptep,
87                                              pte_t pte, int dirty)
88 {
89         return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
90 }
91
92 static inline pte_t huge_ptep_get(pte_t *ptep)
93 {
94         return *ptep;
95 }
96
97 static inline void arch_clear_hugepage_flags(struct page *page)
98 {
99 }
100
101 #ifdef CONFIG_HUGETLB_SUPER_PAGES
102 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
103                                        struct page *page, int writable)
104 {
105         size_t pagesize = huge_page_size(hstate_vma(vma));
106         if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
107                 entry = pte_mksuper(entry);
108         return entry;
109 }
110 #define arch_make_huge_pte arch_make_huge_pte
111
112 /* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
113 enum {
114         HUGE_SHIFT_PGDIR = 0,
115         HUGE_SHIFT_PMD = 1,
116         HUGE_SHIFT_PAGE = 2,
117         HUGE_SHIFT_ENTRIES
118 };
119 extern int huge_shift[HUGE_SHIFT_ENTRIES];
120 #endif
121
122 #endif /* _ASM_TILE_HUGETLB_H */