entropy_sum      1250 fs/btrfs/compression.c 	u32 entropy_sum = 0;
entropy_sum      1258 fs/btrfs/compression.c 		entropy_sum += p * (sz_base - p_base);
entropy_sum      1261 fs/btrfs/compression.c 	entropy_sum /= ws->sample_size;
entropy_sum      1262 fs/btrfs/compression.c 	return entropy_sum * 100 / entropy_max;