--- zzzz-none-000/linux-4.4.60/fs/fcntl.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/fs/fcntl.c	2021-02-04 17:41:59.000000000 +0000
@@ -52,8 +52,10 @@
 		   arg |= O_NONBLOCK;
 
 	if (arg & O_DIRECT) {
+#ifdef CONFIG_DIRECT_IO
 		if (!filp->f_mapping || !filp->f_mapping->a_ops ||
 			!filp->f_mapping->a_ops->direct_IO)
+#endif
 				return -EINVAL;
 	}
 
@@ -138,6 +140,7 @@
 	read_unlock(&filp->f_owner.lock);
 	return pid;
 }
+EXPORT_SYMBOL(sys_dup);
 
 static int f_setown_ex(struct file *filp, unsigned long arg)
 {