rcu: Provide a get_completed_synchronize_rcu() function

[linux-2.6-microblaze.git] / kernel / rcu / tree.c

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index c25ba44..46cfcee 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3911,7 +3911,7 @@ EXPORT_SYMBOL_GPL(start_poll_synchronize_rcu);
  *
  * Yes, this function does not take counter wrap into account.
  * But counter wrap is harmless.  If the counter wraps, we have waited for
- * more than 2 billion grace periods (and way more on a 64-bit system!).
+ * more than a billion grace periods (and way more on a 64-bit system!).
  * Those needing to keep oldstate values for very long time periods
  * (many hours even on 32-bit systems) should check them occasionally
  * and either refresh them or set a flag indicating that the grace period
@@ -3924,7 +3924,8 @@ EXPORT_SYMBOL_GPL(start_poll_synchronize_rcu);
  */
 bool poll_state_synchronize_rcu(unsigned long oldstate)
 {
-       if (rcu_seq_done(&rcu_state.gp_seq, oldstate)) {
+       if (oldstate == RCU_GET_STATE_COMPLETED ||
+           rcu_seq_done_exact(&rcu_state.gp_seq, oldstate)) {
                smp_mb(); /* Ensure GP ends before subsequent accesses. */
                return true;
        }