From: Rik van Riel 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 Signed-off-by: Peter Zijlstra Cc: Linus Torvalds Cc: Andrew Morton Signed-off-by: Ingo Molnar --- mm/pgtable-generic.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: tip/mm/pgtable-generic.c =================================================================== --- tip.orig/mm/pgtable-generic.c +++ tip/mm/pgtable-generic.c @@ -88,7 +88,8 @@ pte_t ptep_clear_flush(struct vm_area_st { 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/