bonding: add proper __rcu annotation for current_arp_slave

Using __rcu annotation actually helps to spot all accesses to
bond->current_arp_slave are correctly protected, with LOCKDEP support.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index d03d2ae..b2e548e 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -195,7 +195,7 @@
 struct bonding {
 	struct   net_device *dev; /* first - useful for panic debug */
 	struct   slave __rcu *curr_active_slave;
-	struct   slave *current_arp_slave;
+	struct   slave __rcu *current_arp_slave;
 	struct   slave *primary_slave;
 	bool     force_primary;
 	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */