- * Enforce compiler-order of store to rcu_gp_ctr before before
- * load rcu_reader ctr.
- * This ensures synchronize_rcu() cannot be starved by readers.
- *
- * Adding a smp_mb() which is _not_ formally required, but makes the
+ * Must commit rcu_gp_ctr update to memory before waiting for quiescent
+ * state. Failure to do so could result in the writer waiting forever
+ * while new readers are always accessing data (no progress). Enforce
+ * compiler-order of store to rcu_gp_ctr before load rcu_reader ctr.
+ */
+ cmm_barrier();
+
+ /*
+ * Adding a cmm_smp_mb() which is _not_ formally required, but makes the