destroy_field_var 4163 kernel/trace/trace_events_hist.c destroy_field_var(hist_data->field_vars[i]); destroy_field_var 4166 kernel/trace/trace_events_hist.c destroy_field_var(hist_data->save_vars[i]); destroy_field_var 4267 kernel/trace/trace_events_hist.c destroy_field_var(field_var);