_usec              34 drivers/net/wireless/ath/ath9k/xmit.c #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
_usec              35 drivers/net/wireless/ath/ath9k/xmit.c #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)