ftrace_graph_init_idle_task  812 include/linux/ftrace.h extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
ftrace_graph_init_idle_task 6071 kernel/sched/core.c 	ftrace_graph_init_idle_task(idle, cpu);
ftrace_graph_init_idle_task  552 kernel/trace/fgraph.c 			ftrace_graph_init_idle_task(idle_task(cpu), cpu);