diff options
author | Rik van Riel <riel@redhat.com> | 2012-10-09 09:31:59 -0400 |
---|---|---|
committer | Mel Gorman <mgorman@suse.de> | 2012-12-11 09:28:34 -0500 |
commit | 8d1acce4537c4e2f5889ed9ba9b8eddb80d99820 (patch) | |
tree | 8032b026c25b3394613abde6d0f22529a1ef4e2a /mm | |
parent | 2c3cf556b2f7ab5823195766eddec6f1a43134f5 (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>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/pgtable-generic.c | 3 |
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, | |||
88 | { | 88 | { |
89 | pte_t pte; | 89 | pte_t pte; |
90 | pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); | 90 | pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); |
91 | flush_tlb_page(vma, address); | 91 | if (pte_accessible(pte)) |
92 | flush_tlb_page(vma, address); | ||
92 | return pte; | 93 | return pte; |
93 | } | 94 | } |
94 | #endif | 95 | #endif |