netlink: Use FIELD_SIZEOF() in netlink_proto_init().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index c0353d55d56fc4221d72153c6f54849cb89f292b..74827e3b26a1b2da78e0029d250d2e20309ab895 100644 (file)
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2185,7 +2185,6 @@ static struct pernet_operations __net_initdata netlink_net_ops = {
 
 static int __init netlink_proto_init(void)
 {
-       struct sk_buff *dummy_skb;
        int i;
        unsigned long limit;
        unsigned int order;
@@ -2194,7 +2193,7 @@ static int __init netlink_proto_init(void)
        if (err != 0)
                goto out;
 
-       BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb));
+       BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb));
 
        nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL);
        if (!nl_table)