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,
113 struct mm_struct *mm = (vma)->vm_mm;
115 pte = ptep_get_and_clear(mm, address, ptep);
116 if (pte_accessible(mm, pte))
117 flush_tlb_page(vma, address);
122 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
123 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
124 pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
128 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
129 VM_BUG_ON(!pmd_trans_huge(*pmdp));
130 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
131 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
134 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
137 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
138 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
139 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
142 assert_spin_locked(pmd_lockptr(mm, pmdp));
145 if (!pmd_huge_pte(mm, pmdp))
146 INIT_LIST_HEAD(&pgtable->lru);
148 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
149 pmd_huge_pte(mm, pmdp) = pgtable;
151 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
154 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
155 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
156 /* no "address" argument so destroys page coloring of some arch */
157 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
161 assert_spin_locked(pmd_lockptr(mm, pmdp));
164 pgtable = pmd_huge_pte(mm, pmdp);
165 if (list_empty(&pgtable->lru))
166 pmd_huge_pte(mm, pmdp) = NULL;
168 pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next,
170 list_del(&pgtable->lru);
174 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
177 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
178 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
179 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
183 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
184 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
186 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
189 #ifndef pmdp_collapse_flush
190 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
191 pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
195 * pmd and hugepage pte format are same. So we could
196 * use the same function.
200 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
201 VM_BUG_ON(pmd_trans_huge(*pmdp));
202 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
203 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
206 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */