parse_u32_arg
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what);
if (parse_u32_arg(&argc, &argv, &key_size,
if (parse_u32_arg(&argc, &argv, &value_size,
if (parse_u32_arg(&argc, &argv, &max_entries,
if (parse_u32_arg(&argc, &argv, &attr.map_flags,