static void set_ftrace_pid_function(ftrace_func_t func)
{
	/* do not set ftrace_pid_function to itself! */
	if (func != ftrace_pid_func)
		ftrace_pid_function = func;
}
static void set_ftrace_pid_function(ftrace_func_t func)
{
	 
	if (func != ftrace_pid_func)
		ftrace_pid_function = func;
}