1 files changed, 12 insertions, 5 deletions

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index dc8f99ee305f..7d7bcf990e99 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -27,13 +27,20 @@ do {				  					\
  * Largely same as above, but only sets the access flags (dirty,
  * accessed, and writable). Furthermore, we know it always gets set
  * to a "more permissive" setting, which allows most architectures
- * to optimize this.
+ * to optimize this. We return whether the PTE actually changed, which
+ * in turn instructs the caller to do things like update__mmu_cache.
+ * This used to be done in the caller, but sparc needs minor faults to
+ * force that call on sun4c so we changed this macro slightly
  */
 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
-do {                                                                      \
-        set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry);         \
-        flush_tlb_page(__vma, __address);                                 \
-} while (0)
+({                                                                        \
+        int __changed = !pte_same(*(__ptep), __entry);                    \
+        if (__changed) {                                                  \
+                set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
+                flush_tlb_page(__vma, __address);                         \
+        }                                                                 \
+        __changed;                                                        \
+})
 #endif
 
 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG