test_cb
typedef int (*test_cb)(struct bpf_object *obj);
test_cb cb)
bpf_for_each_map_elem(&test_array, test_cb, NULL, 0);
bpf_for_each_map_elem(&test_array, test_cb, NULL, 0);
bpf_for_each_map_elem(&test_array, test_cb, NULL, 0);