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

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Date:   Tue,  7 Jan 2020 22:35:59 +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>, Jens Axboe <axboe@...nel.dk>,
        Willem de Bruijn <willemb@...gle.com>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Pedro Tammela <pctammela@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [net-next] 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)

Change the preprocessor conditional to a compiler conditional
to avoid the warning and let the compiler throw away the
function itself.

Fixes: b4653342b151 ("net: Allow to show socket-specific information in /proc/[pid]/fdinfo/[fd]")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 net/socket.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 5230c9e1bdec..444a617819f0 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -151,9 +151,7 @@ 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
+	.show_fdinfo =	IS_ENABLED(CONFIG_PROC_FS) ? sock_show_fdinfo : NULL,
 };
 
 /*
-- 
2.20.0