FPROP_FRAC_BASE
if (unlikely(max_frac < FPROP_FRAC_BASE)) {
} else if (tmp < nr * (FPROP_FRAC_BASE - max_frac)) {
nr = div_u64(tmp + FPROP_FRAC_BASE - max_frac - 1,
FPROP_FRAC_BASE - max_frac);
bdi->max_prop_frac = FPROP_FRAC_BASE;
bdi->max_prop_frac = (FPROP_FRAC_BASE * max_ratio) /