link_fn 501 crypto/asymmetric_keys/asymmetric_type.c key_restrict_link_func_t link_fn = link_fn 511 crypto/asymmetric_keys/asymmetric_type.c link_fn = restrict_link_by_key_or_keyring_chain; link_fn 528 crypto/asymmetric_keys/asymmetric_type.c ret = asymmetric_restriction_alloc(link_fn, key);