MC_HASH_SZ_LOG
return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
u32 hash = hash_32((__force u32)addr, MC_HASH_SZ_LOG);
u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);