--- old/src/os_cpu/linux_ppc/vm/atomic_linux_ppc.hpp	2016-10-10 22:31:59.000000000 +0900
+++ new/src/os_cpu/linux_ppc/vm/atomic_linux_ppc.hpp	2016-10-10 22:31:59.000000000 +0900
@@ -289,7 +289,12 @@
 }
 
 inline void cmpxchg_pre_membar(cmpxchg_memory_order order) {
-  if (order != memory_order_relaxed) {
+  if (order == memory_order_release) {
+    __asm__ __volatile__ (
+      /* release */
+      strasm_lwsync
+      );
+  } else if (order != memory_order_relaxed) {
     __asm__ __volatile__ (
       /* fence */
       strasm_sync
@@ -298,7 +303,9 @@
 }
 
 inline void cmpxchg_post_membar(cmpxchg_memory_order order) {
-  if (order != memory_order_relaxed) {
+  if (order == memory_order_release) {
+    // no post membar
+  } else if (order == memory_order_conservative) {
     __asm__ __volatile__ (
       /* fence */
       strasm_sync