tracing: Add WARN_ON_ONCE when returned value is negative

[linux-2.6-microblaze.git] / kernel / trace / trace_events_hist.c

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index dacd6fe..ba03b7d 100644 (file)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -5232,6 +5232,7 @@ static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
                cmd = hist_data->field_var_hists[i]->cmd;
                ret = event_hist_trigger_func(&trigger_hist_cmd, file,
                                              "!hist", "hist", cmd);
+               WARN_ON_ONCE(ret < 0);
        }
 }