4 * Generic pgtable methods declared in asm-generic/pgtable.h
6 * Copyright (C) 2010 Linus Torvalds
9 #include <linux/pagemap.h>
11 #include <asm-generic/pgtable.h>
13 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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
23 int ptep_set_access_flags(struct vm_area_struct
*vma
,
24 unsigned long address
, pte_t
*ptep
,
25 pte_t entry
, int dirty
)
27 int changed
= !pte_same(*ptep
, entry
);
29 set_pte_at(vma
->vm_mm
, address
, ptep
, entry
);
30 flush_tlb_page(vma
, address
);
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
)
41 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
42 int changed
= !pmd_same(*pmdp
, entry
);
43 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
45 set_pmd_at(vma
->vm_mm
, address
, pmdp
, entry
);
46 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
49 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
52 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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
)
61 young
= ptep_test_and_clear_young(vma
, address
, ptep
);
63 flush_tlb_page(vma
, address
);
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
)
73 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
74 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
77 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
78 young
= pmdp_test_and_clear_young(vma
, address
, pmdp
);
80 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
85 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
86 pte_t
ptep_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
90 pte
= ptep_get_and_clear((vma
)->vm_mm
, address
, ptep
);
91 flush_tlb_page(vma
, address
);
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
,
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
);
107 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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
,
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
);
121 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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