tracing_map_add_var 3527 kernel/trace/trace_events_hist.c 	idx = tracing_map_add_var(hist_data->map);
tracing_map_add_var 5210 kernel/trace/trace_events_hist.c 			idx = tracing_map_add_var(map);
tracing_map_add_var  248 kernel/trace/tracing_map.h extern int tracing_map_add_var(struct tracing_map *map);