net: socket: suppress unused warning

suppress unused warnings and fix the error that there is
with the W=1 enabled.

Warning generated

net/socket.c: In function ‘__sys_getsockopt’:
net/socket.c:2300:13: error: variable ‘max_optlen’ set but not used [-Werror=unused-but-set-variable]
 2300 |         int max_optlen;

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20230310221851.304657-1-vincenzopalazzodev@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/socket.c b/net/socket.c
index 9c92c0e..73e493d 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -2292,9 +2292,9 @@ INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
 int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
                int __user *optlen)
 {
+       int max_optlen __maybe_unused;
        int err, fput_needed;
        struct socket *sock;
-       int max_optlen;
 
        sock = sockfd_lookup_light(fd, &err, &fput_needed);
        if (!sock)