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>
13 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
15 * Only sets the access flags (dirty, accessed, and
16 * writable). Furthermore, we know it always gets set to a "more
17 * permissive" setting, which allows most architectures to optimize
18 * this. We return whether the PTE actually changed, which in turn
19 * instructs the caller to do things like update__mmu_cache. This
20 * used to be done in the caller, but sparc needs minor faults to
21 * force that call on sun4c so we changed this macro slightly
23 int ptep_set_access_flags(struct vm_area_struct *vma,
24 unsigned long address, pte_t *ptep,
25 pte_t entry, int dirty)
27 int changed = !pte_same(*ptep, entry);
29 set_pte_at(vma->vm_mm, address, ptep, entry);
30 flush_tlb_page(vma, address);
36 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
37 int pmdp_set_access_flags(struct vm_area_struct *vma,
38 unsigned long address, pmd_t *pmdp,
39 pmd_t entry, int dirty)
41 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
42 int changed = !pmd_same(*pmdp, entry);
43 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
45 set_pmd_at(vma->vm_mm, address, pmdp, entry);
46 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
49 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
52 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
56 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
57 int ptep_clear_flush_young(struct vm_area_struct *vma,
58 unsigned long address, pte_t *ptep)
61 young = ptep_test_and_clear_young(vma, address, ptep);
63 flush_tlb_page(vma, address);
68 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
69 int pmdp_clear_flush_young(struct vm_area_struct *vma,
70 unsigned long address, pmd_t *pmdp)
73 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
75 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
76 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
77 young = pmdp_test_and_clear_young(vma, address, pmdp);
79 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
84 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
85 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
89 pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
90 flush_tlb_page(vma, address);
95 #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
96 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
97 pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
101 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
102 pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
103 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
106 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
109 #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
110 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
111 pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
114 pmd_t pmd = pmd_mksplitting(*pmdp);
115 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
116 set_pmd_at(vma->vm_mm, address, pmdp, pmd);
117 /* tlb flush only to serialize against gup-fast */
118 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
120 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */