netdev - [PATCH net-next 05/10] dccp: preserve const qualifier in dccp

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Message-ID: <20230317155539.2552954-6-edumazet@google.com>
Date:   Fri, 17 Mar 2023 15:55:34 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Simon Horman <simon.horman@...igine.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 05/10] dccp: preserve const qualifier in dccp_sk()

We can change dccp_sk() to propagate its argument const qualifier,
thanks to container_of_const().

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/dccp.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 07e547c02fd8b23e05f1f45a3915b2987faddbe9..325af611909f99793491b437231eba20b589c032 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -305,10 +305,8 @@ struct dccp_sock {
 	struct timer_list		dccps_xmit_timer;
 };
 
-static inline struct dccp_sock *dccp_sk(const struct sock *sk)
-{
-	return (struct dccp_sock *)sk;
-}
+#define dccp_sk(ptr)	container_of_const(ptr, struct dccp_sock, \
+					   dccps_inet_connection.icsk_inet.sk)
 
 static inline const char *dccp_role(const struct sock *sk)
 {
-- 
2.40.0.rc2.332.ga46443480c-goog