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mm/pgtable-generic.c
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/* * mm/pgtable-generic.c * * Generic pgtable methods declared in asm-generic/pgtable.h * * Copyright (C) 2010 Linus Torvalds */ |
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#include <linux/pagemap.h> |
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#include <asm/tlb.h> #include <asm-generic/pgtable.h> |
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/* * If a p?d_bad entry is found while walking page tables, report * the error, before resetting entry to p?d_none. Usually (but * very seldom) called out from the p?d_none_or_clear_bad macros. */ void pgd_clear_bad(pgd_t *pgd) { pgd_ERROR(*pgd); pgd_clear(pgd); } void pud_clear_bad(pud_t *pud) { pud_ERROR(*pud); pud_clear(pud); } void pmd_clear_bad(pmd_t *pmd) { pmd_ERROR(*pmd); pmd_clear(pmd); } |
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#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS /* |
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* Only sets the access flags (dirty, accessed), as well as write * permission. Furthermore, we know it always gets set to a "more |
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* 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); |
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flush_tlb_fix_spurious_fault(vma, address); |
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} 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; |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE VM_BUG_ON(address & ~HPAGE_PMD_MASK); #else |
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BUG(); #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
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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) { |
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struct mm_struct *mm = (vma)->vm_mm; |
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pte_t pte; |
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pte = ptep_get_and_clear(mm, address, ptep); if (pte_accessible(mm, pte)) |
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flush_tlb_page(vma, address); |
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return pte; } #endif #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { pmd_t pmd; |
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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; } |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
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#endif #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) |
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{ |
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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); |
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} |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
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#endif |
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#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable) |
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{ |
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assert_spin_locked(pmd_lockptr(mm, pmdp)); |
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/* FIFO */ |
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if (!pmd_huge_pte(mm, pmdp)) |
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INIT_LIST_HEAD(&pgtable->lru); else |
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list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru); pmd_huge_pte(mm, pmdp) = pgtable; |
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} #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW #ifdef CONFIG_TRANSPARENT_HUGEPAGE /* no "address" argument so destroys page coloring of some arch */ |
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pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) |
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{ pgtable_t pgtable; |
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assert_spin_locked(pmd_lockptr(mm, pmdp)); |
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/* FIFO */ |
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pgtable = pmd_huge_pte(mm, pmdp); |
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if (list_empty(&pgtable->lru)) |
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pmd_huge_pte(mm, pmdp) = NULL; |
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else { |
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pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next, |
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struct page, lru); list_del(&pgtable->lru); } return pgtable; } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif |
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#ifndef __HAVE_ARCH_PMDP_INVALIDATE #ifdef CONFIG_TRANSPARENT_HUGEPAGE void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { |
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pmd_t entry = *pmdp; if (pmd_numa(entry)) entry = pmd_mknonnuma(entry); |
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set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp)); flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif |