sparc64: Define pte_accessible()

We can elide flush_tlb_*() calls when _PAGE_VALID is clear
as that is the test used to determine whether or not to
queue up a TLB flush in set_pte_at().

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/pgtable_64.h

@@ -617,6 +617,12 @@ static inline unsigned long pte_present(pte_t pte)
 	return val;
 }
 
+#define pte_accessible pte_accessible
+static inline unsigned long pte_accessible(pte_t a)
+{
+	return pte_val(a) & _PAGE_VALID;
+}
+
 static inline unsigned long pte_special(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SPECIAL;
@@ -802,7 +808,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 	 * SUN4V NOTE: _PAGE_VALID is the same value in both the SUN4U
 	 *             and SUN4V pte layout, so this inline test is fine.
 	 */
-	if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID))
+	if (likely(mm != &init_mm) && pte_accessible(orig))
 		tlb_batch_add(mm, addr, ptep, orig, fullmm);
 }