busy_loop_current_time
unsigned long now = busy_loop_current_time();
busy_start = busy_loop_current_time();
busy_start = busy_loop_current_time();
unsigned long now = busy_loop_current_time();
unsigned long now = busy_loop_current_time();
ktime_t now = net_to_ktime(busy_loop_current_time());
unsigned long start_time = busy_loop_current_time();
unsigned long start_time = loop_end ? busy_loop_current_time() : 0;