map__refcnt
refcount_read(map__refcnt(map)) != 1) {
refcount_read(map__refcnt(map)));
refcount_set(map__refcnt(map), 1);
BUG_ON(refcount_read(map__refcnt(map)) != 0);
if (map && refcount_dec_and_test(map__refcnt(map)))
refcount_inc(map__refcnt(map));
assert(refcount_read(map__refcnt(map)) > 1);
assert(refcount_read(map__refcnt(map)) > 0);