bonding: helper macro __ATTR_RO to make code more clear

Signed-off-by: Lianjie Zhang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/bonding/bond_sysfs_slave.c

···
 	ssize_t (*show)(struct slave *, char *);
 };
 
-#define SLAVE_ATTR(_name, _mode, _show)				\
-const struct slave_attribute slave_attr_##_name = {		\
-	.attr = {.name = __stringify(_name),			\
-		 .mode = _mode },				\
-	.show	= _show,					\
-};
 #define SLAVE_ATTR_RO(_name)					\
-	SLAVE_ATTR(_name, 0444, _name##_show)
+const struct slave_attribute slave_attr_##_name = __ATTR_RO(_name)
 
 static ssize_t state_show(struct slave *slave, char *buf)
 {