RC_PID_SMOOTHING_SHIFT   18 net/mac80211/rc80211_pid.h #define RC_PID_SMOOTHING		(1 << RC_PID_SMOOTHING_SHIFT)
RC_PID_SMOOTHING_SHIFT  355 net/mac80211/rc80211_pid_algo.c 	pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;