bpf_map_kzalloc
void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
storage = bpf_map_kzalloc(&smap->map, sizeof(*storage),
selem = bpf_map_kzalloc(&smap->map, smap->elem_size,
node = bpf_map_kzalloc(&map->map, sizeof(*node),