ftrace_startup    603 kernel/trace/fgraph.c 	ret = ftrace_startup(&graph_ops, FTRACE_START_FUNC_RET);
ftrace_startup   4422 kernel/trace/ftrace.c 		ret = ftrace_startup(&probe->ops, 0);
ftrace_startup   6739 kernel/trace/ftrace.c 	ret = ftrace_startup(ops, 0);
ftrace_startup     34 kernel/trace/ftrace_internal.h int ftrace_startup(struct ftrace_ops *ops, int command);