--- zzzz-none-000/linux-3.10.107/mm/backing-dev.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/mm/backing-dev.c	2021-11-10 11:53:56.000000000 +0000
@@ -232,8 +232,6 @@
 			bdi_cap_stable_pages_required(bdi) ? 1 : 0);
 }
 
-#define __ATTR_RW(attr) __ATTR(attr, 0644, attr##_show, attr##_store)
-
 static struct device_attribute bdi_dev_attrs[] = {
 	__ATTR_RW(read_ahead_kb),
 	__ATTR_RW(min_ratio),