diff --git a/fs/proc/root.c b/fs/proc/root.c
index 94e9d73..ec9cb3b 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -212,6 +212,22 @@
 	.parent		= &proc_root,
 };
 
+int pid_ns_prepare_proc(struct pid_namespace *ns)
+{
+	struct vfsmount *mnt;
+
+	mnt = kern_mount_data(&proc_fs_type, ns);
+	if (IS_ERR(mnt))
+		return PTR_ERR(mnt);
+
+	return 0;
+}
+
+void pid_ns_release_proc(struct pid_namespace *ns)
+{
+	mntput(ns->proc_mnt);
+}
+
 EXPORT_SYMBOL(proc_symlink);
 EXPORT_SYMBOL(proc_mkdir);
 EXPORT_SYMBOL(create_proc_entry);