+/*
+ * Dispose of the shared task group credentials
+ */
+#ifdef CONFIG_KEYS
+static void release_tgcred_rcu(struct rcu_head *rcu)
+{
+ struct thread_group_cred *tgcred =
+ container_of(rcu, struct thread_group_cred, rcu);
+
+ BUG_ON(atomic_read(&tgcred->usage) != 0);
+
+ key_put(tgcred->session_keyring);
+ key_put(tgcred->process_keyring);
+ kfree(tgcred);
+}
+#endif
+
+/*
+ * Release a set of thread group credentials.
+ */
+static void release_tgcred(struct cred *cred)
+{
+#ifdef CONFIG_KEYS
+ struct thread_group_cred *tgcred = cred->tgcred;
+
+ if (atomic_dec_and_test(&tgcred->usage))
+ call_rcu(&tgcred->rcu, release_tgcred_rcu);
+#endif
+}
+