ftrace_func_command  340 include/linux/ftrace.h int register_ftrace_command(struct ftrace_func_command *cmd);
ftrace_func_command  341 include/linux/ftrace.h int unregister_ftrace_command(struct ftrace_func_command *cmd);
ftrace_func_command  554 include/linux/ftrace.h static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)