rxrpc: Use FIELD_SIZEOF() in af_rxrpc_init().

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

1 files changed, 2 insertions, 2 deletions

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 05996d0dd828..5b0fd291babb 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/kernel.h>
 #include <linux/net.h>
 #include <linux/slab.h>
 #include <linux/skbuff.h>
@@ -792,10 +793,9 @@ static const struct net_proto_family rxrpc_family_ops = {
  */
 static int __init af_rxrpc_init(void)
 {
-        struct sk_buff *dummy_skb;
         int ret = -1;
 
-        BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
+        BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 
         rxrpc_epoch = htonl(get_seconds());