can_merge
if (can_merge(entry, new_entry)) {
if (can_merge(new_entry, entry)) {
struct page *can_merge = NULL, *page;
if (pr->from == 0 && pr->from != pr->to && page == can_merge) {
can_merge = page + pr->to / PAGE_SIZE;
can_merge = NULL;
if (can_merge(prev_class, pages_per_zspage, objs_per_zspage)) {