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-rw-r--r--stubs/trace-control.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/stubs/trace-control.c b/stubs/trace-control.c
index 3740c38589..2dfcd9fb2b 100644
--- a/stubs/trace-control.c
+++ b/stubs/trace-control.c
@@ -19,10 +19,23 @@ void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
 {
     TraceEventID id;
+    bool state_pre;
     assert(trace_event_get_state_static(ev));
     id = trace_event_get_id(ev);
-    trace_events_enabled_count += state - trace_events_dstate[id];
-    trace_events_dstate[id] = state;
+    /*
+     * We ignore the "vcpu" property here, since there's no target code. Then
+     * dstate can only be 1 or 0.
+     */
+    state_pre = trace_events_dstate[id];
+    if (state_pre != state) {
+        if (state) {
+            trace_events_enabled_count++;
+            trace_events_dstate[id] = 1;
+        } else {
+            trace_events_enabled_count--;
+            trace_events_dstate[id] = 0;
+        }
+    }
 }
 
 void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,