linux-kernel - [PATCH] [net-next] [v2] socket: fix unused-function warning

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Message-Id: <20200108214454.3950090-1-arnd@arndb.de>
Date:   Wed,  8 Jan 2020 22:44:43 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "David S. Miller" <davem@...emloft.net>,
        Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Al Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        Willem de Bruijn <willemb@...gle.com>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Pedro Tammela <pctammela@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [net-next] [v2] socket: fix unused-function warning

When procfs is disabled, the fdinfo code causes a harmless
warning:

net/socket.c:1000:13: error: 'sock_show_fdinfo' defined but not used [-Werror=unused-function]
 static void sock_show_fdinfo(struct seq_file *m, struct file *f)

Move the function definition up so we can use a single #ifdef
around it.

Fixes: b4653342b151 ("net: Allow to show socket-specific information in /proc/[pid]/fdinfo/[fd]")
Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Acked-by: Kirill Tkhai <ktkhai@...tuozzo.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: use an #ifdef instead of a ?: operator
---
 net/socket.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 5230c9e1bdec..f13b84e5c70d 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -128,7 +128,18 @@ static ssize_t sock_sendpage(struct file *file, struct page *page,
 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
 				struct pipe_inode_info *pipe, size_t len,
 				unsigned int flags);
-static void sock_show_fdinfo(struct seq_file *m, struct file *f);
+
+#ifdef CONFIG_PROC_FS
+static void sock_show_fdinfo(struct seq_file *m, struct file *f)
+{
+	struct socket *sock = f->private_data;
+
+	if (sock->ops->show_fdinfo)
+		sock->ops->show_fdinfo(m, sock);
+}
+#else
+#define sock_show_fdinfo NULL
+#endif
 
 /*
  *	Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
@@ -151,9 +162,7 @@ static const struct file_operations socket_file_ops = {
 	.sendpage =	sock_sendpage,
 	.splice_write = generic_splice_sendpage,
 	.splice_read =	sock_splice_read,
-#ifdef CONFIG_PROC_FS
 	.show_fdinfo =	sock_show_fdinfo,
-#endif
 };
 
 /*
@@ -997,14 +1006,6 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	return res;
 }
 
-static void sock_show_fdinfo(struct seq_file *m, struct file *f)
-{
-	struct socket *sock = f->private_data;
-
-	if (sock->ops->show_fdinfo)
-		sock->ops->show_fdinfo(m, sock);
-}
-
 /*
  * Atomic setting of ioctl hooks to avoid race
  * with module unload.
-- 
2.20.0