__key_link_begin
extern int __key_link_begin(struct key *keyring,
ret = __key_link_begin(keyring, &key->index_key, &edit);
link_ret = __key_link_begin(keyring, &key->index_key, &edit);
ret = __key_link_begin(keyring, &index_key, &edit);
ret = __key_link_begin(keyring, &key->index_key, &edit);
ret = __key_link_begin(to_keyring, &key->index_key, &to_edit);
ret = __key_link_begin(dest_keyring, &key->index_key, &edit);
ret = __key_link_begin(dest_keyring, &key->index_key, &edit);