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 p4d_clear_bad(p4d_t *p4d)
31 void pud_clear_bad(pud_t *pud)
37 void pmd_clear_bad(pmd_t *pmd)
43 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
45 * Only sets the access flags (dirty, accessed), as well as write
46 * permission. Furthermore, we know it always gets set to a "more
47 * permissive" setting, which allows most architectures to optimize
48 * this. We return whether the PTE actually changed, which in turn
49 * instructs the caller to do things like update__mmu_cache. This
50 * used to be done in the caller, but sparc needs minor faults to
51 * force that call on sun4c so we changed this macro slightly
53 int ptep_set_access_flags(struct vm_area_struct *vma,
54 unsigned long address, pte_t *ptep,
55 pte_t entry, int dirty)
57 int changed = !pte_same(*ptep, entry);
59 set_pte_at(vma->vm_mm, address, ptep, entry);
60 flush_tlb_fix_spurious_fault(vma, address);
66 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
67 int ptep_clear_flush_young(struct vm_area_struct *vma,
68 unsigned long address, pte_t *ptep)
71 young = ptep_test_and_clear_young(vma, address, ptep);
73 flush_tlb_page(vma, address);
78 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
79 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
82 struct mm_struct *mm = (vma)->vm_mm;
84 pte = ptep_get_and_clear(mm, address, ptep);
85 if (pte_accessible(mm, pte))
86 flush_tlb_page(vma, address);
91 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
93 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
94 int pmdp_set_access_flags(struct vm_area_struct *vma,
95 unsigned long address, pmd_t *pmdp,
96 pmd_t entry, int dirty)
98 int changed = !pmd_same(*pmdp, entry);
99 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
101 set_pmd_at(vma->vm_mm, address, pmdp, entry);
102 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
108 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
109 int pmdp_clear_flush_young(struct vm_area_struct *vma,
110 unsigned long address, pmd_t *pmdp)
113 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
114 young = pmdp_test_and_clear_young(vma, address, pmdp);
116 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
121 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
122 pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
126 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
127 VM_BUG_ON((pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
128 !pmd_devmap(*pmdp)) || !pmd_present(*pmdp));
129 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
130 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
134 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
135 pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
140 VM_BUG_ON(address & ~HPAGE_PUD_MASK);
141 VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
142 pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
143 flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
149 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
150 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
153 assert_spin_locked(pmd_lockptr(mm, pmdp));
156 if (!pmd_huge_pte(mm, pmdp))
157 INIT_LIST_HEAD(&pgtable->lru);
159 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
160 pmd_huge_pte(mm, pmdp) = pgtable;
164 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
165 /* no "address" argument so destroys page coloring of some arch */
166 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
170 assert_spin_locked(pmd_lockptr(mm, pmdp));
173 pgtable = pmd_huge_pte(mm, pmdp);
174 pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
176 if (pmd_huge_pte(mm, pmdp))
177 list_del(&pgtable->lru);
182 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
183 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
187 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
188 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
192 #ifndef pmdp_collapse_flush
193 pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
197 * pmd and hugepage pte format are same. So we could
198 * use the same function.
202 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
203 VM_BUG_ON(pmd_trans_huge(*pmdp));
204 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
206 /* collapse entails shooting down ptes not pmd */
207 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
211 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */