diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index b7403ff..d4cf178 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -316,6 +316,28 @@
 }
 EXPORT_SYMBOL_GPL(__put_net);
 
+struct net *get_net_ns_by_fd(int fd)
+{
+	struct proc_inode *ei;
+	struct file *file;
+	struct net *net;
+
+	net = ERR_PTR(-EINVAL);
+	file = proc_ns_fget(fd);
+	if (!file)
+		goto out;
+
+	ei = PROC_I(file->f_dentry->d_inode);
+	if (ei->ns_ops != &netns_operations)
+		goto out;
+
+	net = get_net(ei->ns);
+out:
+	if (file)
+		fput(file);
+	return net;
+}
+
 #else
 struct net *copy_net_ns(unsigned long flags, struct net *old_net)
 {
@@ -323,6 +345,11 @@
 		return ERR_PTR(-EINVAL);
 	return old_net;
 }
+
+struct net *get_net_ns_by_fd(int fd)
+{
+	return ERR_PTR(-EINVAL);
+}
 #endif
 
 struct net *get_net_ns_by_pid(pid_t pid)
@@ -345,28 +372,6 @@
 }
 EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
 
-struct net *get_net_ns_by_fd(int fd)
-{
-	struct proc_inode *ei;
-	struct file *file;
-	struct net *net;
-
-	net = ERR_PTR(-EINVAL);
-	file = proc_ns_fget(fd);
-	if (!file)
-		goto out;
-
-	ei = PROC_I(file->f_dentry->d_inode);
-	if (ei->ns_ops != &netns_operations)
-		goto out;
-
-	net = get_net(ei->ns);
-out:
-	if (file)
-		fput(file);
-	return net;
-}
-
 static int __init net_ns_init(void)
 {
 	struct net_generic *ng;