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_PTEP_CLEAR_YOUNG_FLUSH
61 int ptep_clear_flush_young(struct vm_area_struct *vma,
62 unsigned long address, pte_t *ptep)
65 young = ptep_test_and_clear_young(vma, address, ptep);
67 flush_tlb_page(vma, address);
72 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
73 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
76 struct mm_struct *mm = (vma)->vm_mm;
78 pte = ptep_get_and_clear(mm, address, ptep);
79 if (pte_accessible(mm, pte))
80 flush_tlb_page(vma, address);
85 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
87 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
88 int pmdp_set_access_flags(struct vm_area_struct *vma,
89 unsigned long address, pmd_t *pmdp,
90 pmd_t entry, int dirty)
92 int changed = !pmd_same(*pmdp, entry);
93 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
95 set_pmd_at(vma->vm_mm, address, pmdp, entry);
96 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
102 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
103 int pmdp_clear_flush_young(struct vm_area_struct *vma,
104 unsigned long address, pmd_t *pmdp)
107 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
108 young = pmdp_test_and_clear_young(vma, address, pmdp);
110 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
115 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
116 pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
120 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
121 VM_BUG_ON(!pmd_trans_huge(*pmdp));
122 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
123 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
128 #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
129 void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
132 pmd_t pmd = pmd_mksplitting(*pmdp);
133 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
134 set_pmd_at(vma->vm_mm, address, pmdp, pmd);
135 /* tlb flush only to serialize against gup-fast */
136 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
140 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
141 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
144 assert_spin_locked(pmd_lockptr(mm, pmdp));
147 if (!pmd_huge_pte(mm, pmdp))
148 INIT_LIST_HEAD(&pgtable->lru);
150 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
151 pmd_huge_pte(mm, pmdp) = pgtable;
155 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
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);
176 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
177 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
181 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
182 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
186 #ifndef pmdp_collapse_flush
187 pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
191 * pmd and hugepage pte format are same. So we could
192 * use the same function.
196 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
197 VM_BUG_ON(pmd_trans_huge(*pmdp));
198 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
199 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
203 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */