AHZ
#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
# if HZ < AHZ
return x * (AHZ / HZ);
return x / (HZ / AHZ);
do_div(tmp, (NSEC_PER_SEC / AHZ));
#if (NSEC_PER_SEC % AHZ) == 0
do_div(x, (NSEC_PER_SEC / AHZ));
#elif (AHZ % 512) == 0
x *= AHZ/512;
do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
/ AHZ));
do_div(elapsed, AHZ);
ac->ac_ahz = AHZ;