diff options
Diffstat (limited to 'mm/pgtable-generic.c')
| -rw-r--r-- | mm/pgtable-generic.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c new file mode 100644 index 000000000000..d030548047e2 --- /dev/null +++ b/mm/pgtable-generic.c @@ -0,0 +1,123 @@ +/* + * mm/pgtable-generic.c + * + * Generic pgtable methods declared in asm-generic/pgtable.h + * + * Copyright (C) 2010 Linus Torvalds + */ + +#include <asm/tlb.h> +#include <asm-generic/pgtable.h> + +#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS +/* + * Only sets the access flags (dirty, accessed, and + * writable). Furthermore, we know it always gets set to a "more + * permissive" setting, which allows most architectures to optimize + * this. We return whether the PTE actually changed, which in turn + * instructs the caller to do things like update__mmu_cache. This + * used to be done in the caller, but sparc needs minor faults to + * force that call on sun4c so we changed this macro slightly + */ +int ptep_set_access_flags(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep, + pte_t entry, int dirty) +{ + int changed = !pte_same(*ptep, entry); + if (changed) { + set_pte_at(vma->vm_mm, address, ptep, entry); + flush_tlb_page(vma, address); + } + return changed; +} +#endif + +#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS +int pmdp_set_access_flags(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp, + pmd_t entry, int dirty) +{ +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + int changed = !pmd_same(*pmdp, entry); + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + if (changed) { + set_pmd_at(vma->vm_mm, address, pmdp, entry); + flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); + } + return changed; +#else /* CONFIG_TRANSPARENT_HUGEPAGE */ + BUG(); + return 0; +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +} +#endif + +#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH +int ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) +{ + int young; + young = ptep_test_and_clear_young(vma, address, ptep); + if (young) + flush_tlb_page(vma, address); + return young; +} +#endif + +#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH +int pmdp_clear_flush_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) +{ + int young; +#ifndef CONFIG_TRANSPARENT_HUGEPAGE + BUG(); +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + young = pmdp_test_and_clear_young(vma, address, pmdp); + if (young) + flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); + return young; +} +#endif + +#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH +pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, + pte_t *ptep) +{ + pte_t pte; + pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); + flush_tlb_page(vma, address); + return pte; +} +#endif + +#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH +pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, + pmd_t *pmdp) +{ + pmd_t pmd; +#ifndef CONFIG_TRANSPARENT_HUGEPAGE + BUG(); +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp); + flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); + return pmd; +} +#endif + +#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH +pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, + pmd_t *pmdp) +{ +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + pmd_t pmd = pmd_mksplitting(*pmdp); + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + set_pmd_at(vma->vm_mm, address, pmdp, pmd); + /* tlb flush only to serialize against gup-fast */ + flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); +#else /* CONFIG_TRANSPARENT_HUGEPAGE */ + BUG(); +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +} +#endif |