diff --git a/net/core/flow.c b/net/core/flow.c
index c4f2538..55789f8 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -20,6 +20,7 @@
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
+#include <linux/mutex.h>
 #include <net/flow.h>
 #include <asm/atomic.h>
 #include <asm/semaphore.h>
@@ -287,11 +288,11 @@
 void flow_cache_flush(void)
 {
 	struct flow_flush_info info;
-	static DECLARE_MUTEX(flow_flush_sem);
+	static DEFINE_MUTEX(flow_flush_sem);
 
 	/* Don't want cpus going down or up during this. */
 	lock_cpu_hotplug();
-	down(&flow_flush_sem);
+	mutex_lock(&flow_flush_sem);
 	atomic_set(&info.cpuleft, num_online_cpus());
 	init_completion(&info.completion);
 
@@ -301,7 +302,7 @@
 	local_bh_enable();
 
 	wait_for_completion(&info.completion);
-	up(&flow_flush_sem);
+	mutex_unlock(&flow_flush_sem);
 	unlock_cpu_hotplug();
 }