linux-kernel - Re: [PATCH] net/core/filter: fix unused-variable warning

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Message-ID: <20180911221326.cwsf6rfpkhvoywhw@ast-mbp>
Date:   Tue, 11 Sep 2018 15:13:28 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        tehnerd@...com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/core/filter: fix unused-variable warning

On Fri, Sep 07, 2018 at 02:50:05PM +0200, Anders Roxell wrote:
> Building with CONFIG_INET=n will show the warning below:
> net/core/filter.c: In function ‘____bpf_getsockopt’:
> net/core/filter.c:4048:19: warning: unused variable ‘tp’ [-Wunused-variable]
>   struct tcp_sock *tp;
>                    ^~
> net/core/filter.c:4046:31: warning: unused variable ‘icsk’ [-Wunused-variable]
>   struct inet_connection_sock *icsk;
>                                ^~~~
> Move the variable declarations inside the {} block where they are used.
> 
> Fixes: 1e215300f138 ("bpf: add TCP_SAVE_SYN/TCP_SAVED_SYN options for bpf_(set|get)sockopt")
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>  net/core/filter.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/core/filter.c b/net/core/filter.c
> index d301134bca3a..0ae7185b2207 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -4043,14 +4043,14 @@ static const struct bpf_func_proto bpf_setsockopt_proto = {
>  BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
>  	   int, level, int, optname, char *, optval, int, optlen)
>  {
> -	struct inet_connection_sock *icsk;
>  	struct sock *sk = bpf_sock->sk;
> -	struct tcp_sock *tp;
>  
>  	if (!sk_fullsock(sk))
>  		goto err_clear;
>  #ifdef CONFIG_INET
>  	if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
> +		struct inet_connection_sock *icsk;
> +		struct tcp_sock *tp;
>  		switch (optname) {

I've added empty line after variable decl and applied.