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mm: Only flush the TLB when clearing an accessible pte 

If ptep_clear_flush() is called to clear a page table entry that is
accessible anyway by the CPU, eg. a _PAGE_PROTNONE page table entry,
there is no need to flush the TLB on remote CPUs.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-vm3rkzevahelwhejx5uwm8ex@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Rik van Riel 2012-10-09 15:31:59 +02:00 committed by Mel Gorman
parent 2c3cf556b2
commit 8d1acce453
1 changed files with 2 additions and 1 deletions
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3
mm/pgtable-generic.c
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@ -88,7 +88,8 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
{
pte_t pte;
pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
flush_tlb_page(vma, address);
if (pte_accessible(pte))
flush_tlb_page(vma, address);
return pte;
}
#endif