sock_dereference
for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \
pmc = sock_dereference(pmc->next, sk))
psl = sock_dereference(iml->sflist, sk);
(mc_lst = sock_dereference(*lnk, sk)) != NULL;
while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
psl = sock_dereference(pmc->sflist, sk);
psl = sock_dereference(pmc->sflist, sk);
psl = sock_dereference(pmc->sflist, sk);