*** old/src/share/vm/gc_implementation/shared/gcTrace.cpp	Tue Feb 19 11:00:19 2013
--- new/src/share/vm/gc_implementation/shared/gcTrace.cpp	Tue Feb 19 11:00:18 2013

*** 25,43 ****
--- 25,42 ----
  #include "precompiled.hpp"
  #include "gc_implementation/shared/gcHeapSummary.hpp"
  #include "gc_implementation/shared/gcTimer.hpp"
  #include "gc_implementation/shared/gcTrace.hpp"
  #include "memory/referenceProcessorStats.hpp"
  #include "runtime/atomic.hpp"
  #include "utilities/globalDefinitions.hpp"
  
  #define assert_unset_gc_id() assert(_shared_gc_info.id() == SharedGCInfo::UNSET_GCID, "GC already started?")
  #define assert_set_gc_id() assert(_shared_gc_info.id() != SharedGCInfo::UNSET_GCID, "GC not started?")
  
- static volatile jlong GCTracer_next_gc_id = 0;
  static GCId create_new_gc_id() {
!   return Atomic::add((jlong)1, &GCTracer_next_gc_id);
!   return GCTracer_next_gc_id++;
  }
  
  void GCTracer::report_gc_start_impl(GCCause::Cause cause, jlong timestamp) {
    assert_unset_gc_id();