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1 | /* |
2 | * mm/pgtable-generic.c |
3 | * |
4 | * Generic pgtable methods declared in asm-generic/pgtable.h |
5 | * |
6 | * Copyright (C) 2010 Linus Torvalds |
7 | */ |
8 | |
9 | #include <linux/pagemap.h> |
10 | #include <asm/tlb.h> |
11 | #include <asm-generic/pgtable.h> |
12 | |
13 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
14 | /* |
15 | * Only sets the access flags (dirty, accessed, and |
16 | * writable). Furthermore, we know it always gets set to a "more |
17 | * permissive" setting, which allows most architectures to optimize |
18 | * this. We return whether the PTE actually changed, which in turn |
19 | * instructs the caller to do things like update__mmu_cache. This |
20 | * used to be done in the caller, but sparc needs minor faults to |
21 | * force that call on sun4c so we changed this macro slightly |
22 | */ |
23 | int ptep_set_access_flags(struct vm_area_struct *vma, |
24 | unsigned long address, pte_t *ptep, |
25 | pte_t entry, int dirty) |
26 | { |
27 | int changed = !pte_same(*ptep, entry); |
28 | if (changed) { |
29 | set_pte_at(vma->vm_mm, address, ptep, entry); |
30 | flush_tlb_page(vma, address); |
31 | } |
32 | return changed; |
33 | } |
34 | #endif |
35 | |
36 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS |
37 | int pmdp_set_access_flags(struct vm_area_struct *vma, |
38 | unsigned long address, pmd_t *pmdp, |
39 | pmd_t entry, int dirty) |
40 | { |
41 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
42 | int changed = !pmd_same(*pmdp, entry); |
43 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
44 | if (changed) { |
45 | set_pmd_at(vma->vm_mm, address, pmdp, entry); |
46 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
47 | } |
48 | return changed; |
49 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
50 | BUG(); |
51 | return 0; |
52 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
53 | } |
54 | #endif |
55 | |
56 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
57 | int ptep_clear_flush_young(struct vm_area_struct *vma, |
58 | unsigned long address, pte_t *ptep) |
59 | { |
60 | int young; |
61 | young = ptep_test_and_clear_young(vma, address, ptep); |
62 | if (young) |
63 | flush_tlb_page(vma, address); |
64 | return young; |
65 | } |
66 | #endif |
67 | |
68 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH |
69 | int pmdp_clear_flush_young(struct vm_area_struct *vma, |
70 | unsigned long address, pmd_t *pmdp) |
71 | { |
72 | int young; |
73 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
74 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
75 | #else |
76 | BUG(); |
77 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
78 | young = pmdp_test_and_clear_young(vma, address, pmdp); |
79 | if (young) |
80 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
81 | return young; |
82 | } |
83 | #endif |
84 | |
85 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH |
86 | pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, |
87 | pte_t *ptep) |
88 | { |
89 | pte_t pte; |
90 | pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); |
91 | flush_tlb_page(vma, address); |
92 | return pte; |
93 | } |
94 | #endif |
95 | |
96 | #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH |
97 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
98 | pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, |
99 | pmd_t *pmdp) |
100 | { |
101 | pmd_t pmd; |
102 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
103 | pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp); |
104 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
105 | return pmd; |
106 | } |
107 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
108 | #endif |
109 | |
110 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH |
111 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
112 | void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, |
113 | pmd_t *pmdp) |
114 | { |
115 | pmd_t pmd = pmd_mksplitting(*pmdp); |
116 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
117 | set_pmd_at(vma->vm_mm, address, pmdp, pmd); |
118 | /* tlb flush only to serialize against gup-fast */ |
119 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
120 | } |
121 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
122 | #endif |
123 |
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