diff_by_scaled_ppm
negative = diff_by_scaled_ppm(base, scaled_ppm, &adj);
neg_adj = diff_by_scaled_ppm(1 << 24, scaled_ppm, &correction);
neg_adj = diff_by_scaled_ppm(IGB_82580_BASE_PERIOD, scaled_ppm, &rate);
neg_adj = diff_by_scaled_ppm(base, scaled_ppm, &rate);
if (diff_by_scaled_ppm(1ULL << 35, scaled_ppm, &u64_delta))
if (diff_by_scaled_ppm(base, scaled_ppm, &diff))