const: make block_device_operations const

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 8f05d4d..635d16d 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -106,7 +106,7 @@
 
 #define MAX_DEV (16)
 
-static struct block_device_operations ubd_blops = {
+static const struct block_device_operations ubd_blops = {
         .owner		= THIS_MODULE,
         .open		= ubd_open,
         .release	= ubd_release,