struct debug_el *el = container_of(cur, struct debug_el, l_h);
int cmp_result = cmp(NULL, cur, cur->next);
if (cur->next->prev != cur) {
struct debug_el *el = container_of(cur, struct debug_el, l_h);
int cmp_result = cmp(NULL, cur, cur->next);
if (cur->next->prev != cur) {