1 files changed, 4 insertions, 4 deletions

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index eb8dcd1bc4b5..cb5879386a02 100644
--- a/kernel/rcutree_plugin.h
+++ b/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. */