--- zzzz-none-000/linux-4.4.60/include/linux/fs.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/include/linux/fs.h	2021-02-04 17:41:59.000000000 +0000
@@ -2717,6 +2717,7 @@
 	DIO_SKIP_DIO_COUNT = 0x08,
 };
 
+#ifdef CONFIG_DIRECT_IO
 void dio_end_io(struct bio *bio, int error);
 
 ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
@@ -2724,6 +2725,18 @@
 			     loff_t offset, get_block_t get_block,
 			     dio_iodone_t end_io, dio_submit_t submit_io,
 			     int flags);
+#else
+static inline void dio_end_io(struct bio *bio, int error)
+{
+}
+static inline ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
+	struct block_device *bdev, struct iov_iter *iter, loff_t offset,
+	get_block_t get_block, dio_iodone_t end_io,
+	dio_submit_t submit_io,	int flags)
+{
+	return -EOPNOTSUPP;
+}
+#endif
 
 static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
 					 struct inode *inode,