[PATCH] l2tp: fix unused function warning

[PATCH] l2tp: fix unused function warning

[Arnd Bergmann]

Removing one of the callers of pppol2tp_session_get_sock caused a harmless
warning in some configurations:

net/l2tp/l2tp_ppp.c:142:21: 'pppol2tp_session_get_sock' defined but not used [-Wunused-function]

Rather than adding another #ifdef here, using a proper IS_ENABLED()
check makes the code more readable and avoids those warnings while
letting the compiler figure out for itself which code is needed.

This adds one pointer for the unused show() callback in struct
l2tp_session, but that seems harmless.

Fixes: b0e29063dcb3 ("l2tp: remove pppol2tp_session_ioctl()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 net/l2tp/l2tp_core.h | 2 --
 net/l2tp/l2tp_eth.c  | 7 ++-----
 net/l2tp/l2tp_ppp.c  | 7 ++-----
 3 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 8480a0af973e..9c9afe94d389 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -118,9 +118,7 @@ struct l2tp_session {
 	int (*build_header)(struct l2tp_session *session, void *buf);
 	void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
 	void (*session_close)(struct l2tp_session *session);
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
 	void (*show)(struct seq_file *m, void *priv);
-#endif
 	uint8_t			priv[0];	/* private data */
 };
 
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 3728986ec885..8aadc4f3bb9e 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -199,7 +199,6 @@ static void l2tp_eth_delete(struct l2tp_session *session)
 	}
 }
 
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
 static void l2tp_eth_show(struct seq_file *m, void *arg)
 {
 	struct l2tp_session *session = arg;
@@ -219,7 +218,6 @@ static void l2tp_eth_show(struct seq_file *m, void *arg)
 
 	dev_put(dev);
 }
-#endif
 
 static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
 				struct l2tp_session *session,
@@ -305,9 +303,8 @@ static int l2tp_eth_create(struct net *net, struct l2tp_tunnel *tunnel,
 
 	session->recv_skb = l2tp_eth_dev_recv;
 	session->session_close = l2tp_eth_delete;
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
-	session->show = l2tp_eth_show;
-#endif
+	if (IS_ENABLED(CONFIG_L2TP_DEBUGFS))
+		session->show = l2tp_eth_show;
 
 	spriv = l2tp_session_priv(session);
 
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 62f2d3f1e431..04d9946dcdba 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -533,7 +533,6 @@ static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
 	return error;
 }
 
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
 static void pppol2tp_show(struct seq_file *m, void *arg)
 {
 	struct l2tp_session *session = arg;
@@ -547,16 +546,14 @@ static void pppol2tp_show(struct seq_file *m, void *arg)
 		sock_put(sk);
 	}
 }
-#endif
 
 static void pppol2tp_session_init(struct l2tp_session *session)
 {
 	struct pppol2tp_session *ps;
 
 	session->recv_skb = pppol2tp_recv;
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
-	session->show = pppol2tp_show;
-#endif
+	if (IS_ENABLED(CONFIG_L2TP_DEBUGFS))
+		session->show = pppol2tp_show;
 
 	ps = l2tp_session_priv(session);
 	mutex_init(&ps->sk_lock);
-- 
2.18.0

Re: [PATCH] l2tp: fix unused function warning

[David Miller]

From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 13 Aug 2018 23:43:05 +0200

> Removing one of the callers of pppol2tp_session_get_sock caused a harmless
> warning in some configurations:
> 
> net/l2tp/l2tp_ppp.c:142:21: 'pppol2tp_session_get_sock' defined but not used [-Wunused-function]
> 
> Rather than adding another #ifdef here, using a proper IS_ENABLED()
> check makes the code more readable and avoids those warnings while
> letting the compiler figure out for itself which code is needed.
> 
> This adds one pointer for the unused show() callback in struct
> l2tp_session, but that seems harmless.
> 
> Fixes: b0e29063dcb3 ("l2tp: remove pppol2tp_session_ioctl()")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Applied.