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Linux/mm/pgtable-generic.c

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  1 /*
  2  *  mm/pgtable-generic.c
  3  *
  4  *  Generic pgtable methods declared in asm-generic/pgtable.h
  5  *
  6  *  Copyright (C) 2010  Linus Torvalds
  7  */
  8 
  9 #include <linux/pagemap.h>
 10 #include <asm/tlb.h>
 11 #include <asm-generic/pgtable.h>
 12 
 13 /*
 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.
 17  */
 18 
 19 void pgd_clear_bad(pgd_t *pgd)
 20 {
 21         pgd_ERROR(*pgd);
 22         pgd_clear(pgd);
 23 }
 24 
 25 void pud_clear_bad(pud_t *pud)
 26 {
 27         pud_ERROR(*pud);
 28         pud_clear(pud);
 29 }
 30 
 31 void pmd_clear_bad(pmd_t *pmd)
 32 {
 33         pmd_ERROR(*pmd);
 34         pmd_clear(pmd);
 35 }
 36 
 37 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 38 /*
 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
 46  */
 47 int ptep_set_access_flags(struct vm_area_struct *vma,
 48                           unsigned long address, pte_t *ptep,
 49                           pte_t entry, int dirty)
 50 {
 51         int changed = !pte_same(*ptep, entry);
 52         if (changed) {
 53                 set_pte_at(vma->vm_mm, address, ptep, entry);
 54                 flush_tlb_fix_spurious_fault(vma, address);
 55         }
 56         return changed;
 57 }
 58 #endif
 59 
 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)
 64 {
 65 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 66         int changed = !pmd_same(*pmdp, entry);
 67         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 68         if (changed) {
 69                 set_pmd_at(vma->vm_mm, address, pmdp, entry);
 70                 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 71         }
 72         return changed;
 73 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 74         BUG();
 75         return 0;
 76 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 77 }
 78 #endif
 79 
 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)
 83 {
 84         int young;
 85         young = ptep_test_and_clear_young(vma, address, ptep);
 86         if (young)
 87                 flush_tlb_page(vma, address);
 88         return young;
 89 }
 90 #endif
 91 
 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)
 95 {
 96         int young;
 97 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 98         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 99 #else
100         BUG();
101 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
102         young = pmdp_test_and_clear_young(vma, address, pmdp);
103         if (young)
104                 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
105         return young;
106 }
107 #endif
108 
109 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
110 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
111                        pte_t *ptep)
112 {
113         struct mm_struct *mm = (vma)->vm_mm;
114         pte_t pte;
115         pte = ptep_get_and_clear(mm, address, ptep);
116         if (pte_accessible(mm, pte))
117                 flush_tlb_page(vma, address);
118         return pte;
119 }
120 #endif
121 
122 #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
123 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
124 pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
125                        pmd_t *pmdp)
126 {
127         pmd_t pmd;
128         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
129         pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
130         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
131         return pmd;
132 }
133 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
134 #endif
135 
136 #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
137 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
138 void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
139                           pmd_t *pmdp)
140 {
141         pmd_t pmd = pmd_mksplitting(*pmdp);
142         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
143         set_pmd_at(vma->vm_mm, address, pmdp, pmd);
144         /* tlb flush only to serialize against gup-fast */
145         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
146 }
147 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
148 #endif
149 
150 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
151 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
152 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
153                                 pgtable_t pgtable)
154 {
155         assert_spin_locked(pmd_lockptr(mm, pmdp));
156 
157         /* FIFO */
158         if (!pmd_huge_pte(mm, pmdp))
159                 INIT_LIST_HEAD(&pgtable->lru);
160         else
161                 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
162         pmd_huge_pte(mm, pmdp) = pgtable;
163 }
164 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
165 #endif
166 
167 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
168 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
169 /* no "address" argument so destroys page coloring of some arch */
170 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
171 {
172         pgtable_t pgtable;
173 
174         assert_spin_locked(pmd_lockptr(mm, pmdp));
175 
176         /* FIFO */
177         pgtable = pmd_huge_pte(mm, pmdp);
178         if (list_empty(&pgtable->lru))
179                 pmd_huge_pte(mm, pmdp) = NULL;
180         else {
181                 pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next,
182                                               struct page, lru);
183                 list_del(&pgtable->lru);
184         }
185         return pgtable;
186 }
187 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
188 #endif
189 
190 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
191 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
192 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
193                      pmd_t *pmdp)
194 {
195         pmd_t entry = *pmdp;
196         set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
197         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
198 }
199 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
200 #endif
201 

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