tcp: change ICSK_CA_PRIV_SIZE definition

Instead of a magic number (13 currently) and having
to change it every other year, use sizeof_field() macro.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 3c8c59471bc19d53c0cebd4a7e5ef42886d34783..b06c2d02ec84e96c6222ac608473d7eaf71e5590 100644 (file)
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -135,7 +135,7 @@ struct inet_connection_sock {
        u32                       icsk_user_timeout;
 
        u64                       icsk_ca_priv[104 / sizeof(u64)];
-#define ICSK_CA_PRIV_SIZE      (13 * sizeof(u64))
+#define ICSK_CA_PRIV_SIZE        sizeof_field(struct inet_connection_sock, icsk_ca_priv)
 };
 
 #define ICSK_TIME_RETRANS      1       /* Retransmit timer */