sz_base          1251 fs/btrfs/compression.c 	u32 p, p_base, sz_base;
sz_base          1254 fs/btrfs/compression.c 	sz_base = ilog2_w(ws->sample_size);
sz_base          1258 fs/btrfs/compression.c 		entropy_sum += p * (sz_base - p_base);