b3697c0255
pmdp_get_and_clear/pmdp_clear_flush/pmdp_splitting_flush were trapped as BUG() and they were defined only to diminish the risk of build issues on not-x86 archs and to be consistent with the generic pte methods previously defined in include/asm-generic/pgtable.h. But they are causing more trouble than they were supposed to solve, so it's simpler not to define them when THP is off. This is also correcting the export of pmdp_splitting_flush which is currently unused (x86 isn't using the generic implementation in mm/pgtable-generic.c and no other arch needs that [yet]). Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Sam Ravnborg <sam@ravnborg.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* mm/pgtable-generic.c
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*
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* Generic pgtable methods declared in asm-generic/pgtable.h
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*
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* Copyright (C) 2010 Linus Torvalds
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*/
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#include <asm/tlb.h>
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#include <asm-generic/pgtable.h>
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#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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/*
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* Only sets the access flags (dirty, accessed, and
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* writable). Furthermore, we know it always gets set to a "more
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* permissive" setting, which allows most architectures to optimize
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* this. We return whether the PTE actually changed, which in turn
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* instructs the caller to do things like update__mmu_cache. This
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* used to be done in the caller, but sparc needs minor faults to
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* force that call on sun4c so we changed this macro slightly
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*/
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int ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep,
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pte_t entry, int dirty)
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{
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int changed = !pte_same(*ptep, entry);
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if (changed) {
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set_pte_at(vma->vm_mm, address, ptep, entry);
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flush_tlb_page(vma, address);
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}
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return changed;
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}
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#endif
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#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
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int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty)
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{
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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int changed = !pmd_same(*pmdp, entry);
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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if (changed) {
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set_pmd_at(vma->vm_mm, address, pmdp, entry);
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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}
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return changed;
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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BUG();
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return 0;
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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}
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#endif
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#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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int ptep_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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int young;
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young = ptep_test_and_clear_young(vma, address, ptep);
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if (young)
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flush_tlb_page(vma, address);
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return young;
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}
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#endif
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#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
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int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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int young;
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
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BUG();
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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young = pmdp_test_and_clear_young(vma, address, pmdp);
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if (young)
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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return young;
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}
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#endif
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#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
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pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
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pte_t *ptep)
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{
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pte_t pte;
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pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
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flush_tlb_page(vma, address);
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return pte;
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}
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#endif
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#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,
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pmd_t *pmdp)
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{
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pmd_t pmd;
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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return pmd;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t pmd = pmd_mksplitting(*pmdp);
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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set_pmd_at(vma->vm_mm, address, pmdp, pmd);
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/* tlb flush only to serialize against gup-fast */
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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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