--- old/src/share/vm/runtime/atomic.cpp	2014-09-11 23:19:49.000000000 +0200
+++ new/src/share/vm/runtime/atomic.cpp	2014-09-11 23:19:49.000000000 +0200
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "runtime/atomic.inline.hpp"
 
+#ifndef X86
 jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
   assert(sizeof(jbyte) == 1, "assumption.");
   uintptr_t dest_addr = (uintptr_t)dest;
@@ -44,6 +45,7 @@
   }
   return cur_as_bytes[offset];
 }
+#endif
 
 unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) {
   assert(sizeof(unsigned int) == sizeof(jint), "more work to do");