KMEM_HASH
uintptr_t bucket = (uintptr_t)KMEM_HASH(cp, buf);
for (bcp = *KMEM_HASH(cp, buf); bcp; bcp = bcp->bc_next)
hash_bucket = KMEM_HASH(cp, buf);
prev_bcpp = KMEM_HASH(cp, buf);
kmem_bufctl_t **hash_bucket = KMEM_HASH(cp, addr);
for (bcp = *KMEM_HASH(cp, buf);