diff --git a/[refs] b/[refs]
index 4a23de225302..36298499004a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 25d30cf4250f74e5ceb35f8f39739782408db633
+refs/heads/master: bcfa57ce10d3d53d37a6e324f3010b1ce6a2784a
diff --git a/trunk/kernel/rcutree_plugin.h b/trunk/kernel/rcutree_plugin.h
index eb8dcd1bc4b5..cb5879386a02 100644
--- a/trunk/kernel/rcutree_plugin.h
+++ b/trunk/kernel/rcutree_plugin.h
@@ -677,7 +677,7 @@ void synchronize_rcu(void)
 EXPORT_SYMBOL_GPL(synchronize_rcu);
 
 static DECLARE_WAIT_QUEUE_HEAD(sync_rcu_preempt_exp_wq);
-static long sync_rcu_preempt_exp_count;
+static unsigned long sync_rcu_preempt_exp_count;
 static DEFINE_MUTEX(sync_rcu_preempt_exp_mutex);
 
 /*
@@ -792,7 +792,7 @@ void synchronize_rcu_expedited(void)
 	unsigned long flags;
 	struct rcu_node *rnp;
 	struct rcu_state *rsp = &rcu_preempt_state;
-	long snap;
+	unsigned long snap;
 	int trycount = 0;
 
 	smp_mb(); /* Caller's modifications seen first by other CPUs. */
@@ -811,10 +811,10 @@ void synchronize_rcu_expedited(void)
 			synchronize_rcu();
 			return;
 		}
-		if ((ACCESS_ONCE(sync_rcu_preempt_exp_count) - snap) > 0)
+		if (ULONG_CMP_LT(snap, ACCESS_ONCE(sync_rcu_preempt_exp_count)))
 			goto mb_ret; /* Others did our work for us. */
 	}
-	if ((ACCESS_ONCE(sync_rcu_preempt_exp_count) - snap) > 0)
+	if (ULONG_CMP_LT(snap, ACCESS_ONCE(sync_rcu_preempt_exp_count)))
 		goto unlock_mb_ret; /* Others did our work for us. */
 
 	/* force all RCU readers onto ->blkd_tasks lists. */