MINSTREL_SCALE     15 net/mac80211/rc80211_minstrel.h #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
MINSTREL_SCALE     16 net/mac80211/rc80211_minstrel.h #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)