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authorRik van Riel <riel@redhat.com>2012-10-09 15:31:59 +0200
committerMel Gorman <mgorman@suse.de>2012-12-11 14:28:34 +0000
commit8d1acce4537c4e2f5889ed9ba9b8eddb80d99820 (patch)
tree8032b026c25b3394613abde6d0f22529a1ef4e2a
parent2c3cf556b2f7ab5823195766eddec6f1a43134f5 (diff)
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>
-rw-r--r--mm/pgtable-generic.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index d8397da42fe6..0c8323fe6c8f 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -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