--- zzzz-none-000/linux-3.10.107/drivers/mtd/mtdblock_ro.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/mtd/mtdblock_ro.c	2021-02-04 17:41:59.000000000 +0000
@@ -24,6 +24,7 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/blktrans.h>
 #include <linux/module.h>
+#include <linux/major.h>
 
 static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
 			      unsigned long block, char *buf)
@@ -70,7 +71,7 @@
 
 static struct mtd_blktrans_ops mtdblock_tr = {
 	.name		= "mtdblock",
-	.major		= 31,
+	.major		= MTD_BLOCK_MAJOR,
 	.part_bits	= 0,
 	.blksize 	= 512,
 	.readsect	= mtdblock_readsect,