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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>
14 * If a p?d_bad entry is found while walking page tables, report
15 * the error, before resetting entry to p?d_none. Usually (but
16 * very seldom) called out from the p?d_none_or_clear_bad macros.
19 void pgd_clear_bad(pgd_t
*pgd
)
25 void pud_clear_bad(pud_t
*pud
)
31 void pmd_clear_bad(pmd_t
*pmd
)
37 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
39 * Only sets the access flags (dirty, accessed), as well as write
40 * permission. Furthermore, we know it always gets set to a "more
41 * permissive" setting, which allows most architectures to optimize
42 * this. We return whether the PTE actually changed, which in turn
43 * instructs the caller to do things like update__mmu_cache. This
44 * used to be done in the caller, but sparc needs minor faults to
45 * force that call on sun4c so we changed this macro slightly
47 int ptep_set_access_flags(struct vm_area_struct
*vma
,
48 unsigned long address
, pte_t
*ptep
,
49 pte_t entry
, int dirty
)
51 int changed
= !pte_same(*ptep
, entry
);
53 set_pte_at(vma
->vm_mm
, address
, ptep
, entry
);
54 flush_tlb_fix_spurious_fault(vma
, address
);
60 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
61 int pmdp_set_access_flags(struct vm_area_struct
*vma
,
62 unsigned long address
, pmd_t
*pmdp
,
63 pmd_t entry
, int dirty
)
65 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
66 int changed
= !pmd_same(*pmdp
, entry
);
67 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
69 set_pmd_at(vma
->vm_mm
, address
, pmdp
, entry
);
70 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
73 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
76 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
80 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
81 int ptep_clear_flush_young(struct vm_area_struct
*vma
,
82 unsigned long address
, pte_t
*ptep
)
85 young
= ptep_test_and_clear_young(vma
, address
, ptep
);
87 flush_tlb_page(vma
, address
);
92 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
93 int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
94 unsigned long address
, pmd_t
*pmdp
)
97 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
98 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
101 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
102 young
= pmdp_test_and_clear_young(vma
, address
, pmdp
);
104 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
109 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
110 pte_t
ptep_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
114 pte
= ptep_get_and_clear((vma
)->vm_mm
, address
, ptep
);
115 if (pte_accessible(pte
))
116 flush_tlb_page(vma
, address
);
121 #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
122 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
123 pmd_t
pmdp_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
127 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
128 pmd
= pmdp_get_and_clear(vma
->vm_mm
, address
, pmdp
);
129 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
132 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
135 #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
136 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
137 void pmdp_splitting_flush(struct vm_area_struct
*vma
, unsigned long address
,
140 pmd_t pmd
= pmd_mksplitting(*pmdp
);
141 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
142 set_pmd_at(vma
->vm_mm
, address
, pmdp
, pmd
);
143 /* tlb flush only to serialize against gup-fast */
144 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
146 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
149 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
150 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
151 void pgtable_trans_huge_deposit(struct mm_struct
*mm
, pmd_t
*pmdp
,
154 assert_spin_locked(pmd_lockptr(mm
, pmdp
));
157 if (!pmd_huge_pte(mm
, pmdp
))
158 INIT_LIST_HEAD(&pgtable
->lru
);
160 list_add(&pgtable
->lru
, &pmd_huge_pte(mm
, pmdp
)->lru
);
161 pmd_huge_pte(mm
, pmdp
) = pgtable
;
163 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
166 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
167 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
168 /* no "address" argument so destroys page coloring of some arch */
169 pgtable_t
pgtable_trans_huge_withdraw(struct mm_struct
*mm
, pmd_t
*pmdp
)
173 assert_spin_locked(pmd_lockptr(mm
, pmdp
));
176 pgtable
= pmd_huge_pte(mm
, pmdp
);
177 if (list_empty(&pgtable
->lru
))
178 pmd_huge_pte(mm
, pmdp
) = NULL
;
180 pmd_huge_pte(mm
, pmdp
) = list_entry(pgtable
->lru
.next
,
182 list_del(&pgtable
->lru
);
186 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
189 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
190 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
191 void pmdp_invalidate(struct vm_area_struct
*vma
, unsigned long address
,
194 set_pmd_at(vma
->vm_mm
, address
, pmdp
, pmd_mknotpresent(*pmdp
));
195 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
197 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */