linux-kernel - Re: [PATCH bpf-next] bpf: tcp: Fix unused function warnings

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Message-ID: <CACAyw9_B+qNYHPrDPfYszjOwJbiV92vehT7BA_NGuFtzkj0D0w@mail.gmail.com>
Date:   Thu, 19 Mar 2020 15:38:00 +0000
From:   Lorenz Bauer <lmb@...udflare.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        John Fastabend <john.fastabend@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] bpf: tcp: Fix unused function warnings

On Thu, 19 Mar 2020 at 12:47, YueHaibing <yuehaibing@...wei.com> wrote:
>
> If BPF_STREAM_PARSER is not set, gcc warns:
>
> net/ipv4/tcp_bpf.c:483:12: warning: 'tcp_bpf_sendpage' defined but not used [-Wunused-function]
> net/ipv4/tcp_bpf.c:395:12: warning: 'tcp_bpf_sendmsg' defined but not used [-Wunused-function]
> net/ipv4/tcp_bpf.c:13:13: warning: 'tcp_bpf_stream_read' defined but not used [-Wunused-function]
>
> Moves the unused functions into the #ifdef

Thanks for fixing this.

Reviewed-by: Lorenz Bauer <lmb@...udflare.com>


>
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  net/ipv4/tcp_bpf.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
> index fe7b4fbc31c1..37c91f25cae3 100644
> --- a/net/ipv4/tcp_bpf.c
> +++ b/net/ipv4/tcp_bpf.c
> @@ -10,19 +10,6 @@
>  #include <net/inet_common.h>
>  #include <net/tls.h>
>
> -static bool tcp_bpf_stream_read(const struct sock *sk)
> -{
> -       struct sk_psock *psock;
> -       bool empty = true;
> -
> -       rcu_read_lock();
> -       psock = sk_psock(sk);
> -       if (likely(psock))
> -               empty = list_empty(&psock->ingress_msg);
> -       rcu_read_unlock();
> -       return !empty;
> -}
> -
>  static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
>                              int flags, long timeo, int *err)
>  {
> @@ -298,6 +285,20 @@ int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg,
>  }
>  EXPORT_SYMBOL_GPL(tcp_bpf_sendmsg_redir);
>
> +#ifdef CONFIG_BPF_STREAM_PARSER
> +static bool tcp_bpf_stream_read(const struct sock *sk)
> +{
> +       struct sk_psock *psock;
> +       bool empty = true;
> +
> +       rcu_read_lock();
> +       psock = sk_psock(sk);
> +       if (likely(psock))
> +               empty = list_empty(&psock->ingress_msg);
> +       rcu_read_unlock();
> +       return !empty;
> +}
> +
>  static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
>                                 struct sk_msg *msg, int *copied, int flags)
>  {
> @@ -528,7 +529,6 @@ static int tcp_bpf_sendpage(struct sock *sk, struct page *page, int offset,
>         return copied ? copied : err;
>  }
>
> -#ifdef CONFIG_BPF_STREAM_PARSER
>  enum {
>         TCP_BPF_IPV4,
>         TCP_BPF_IPV6,
> --
> 2.17.1
>
>


--
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

www.cloudflare.com