linux-kernel - Re: [PATCH v2] samples/bpf: xdpsock: fix swap.cocci warning

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Message-ID: <877dccwn6x.fsf@toke.dk>
Date:   Fri, 10 Dec 2021 15:26:30 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Yihao Han <hanyihao@...o.com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kernel@...o.com, Yihao Han <hanyihao@...o.com>
Subject: Re: [PATCH v2] samples/bpf: xdpsock: fix swap.cocci warning

Yihao Han <hanyihao@...o.com> writes:

> Fix following swap.cocci warning:
> ./samples/bpf/xdpsock_user.c:528:22-23:
> WARNING opportunity for swap()
>
> Signed-off-by: Yihao Han <hanyihao@...o.com>

Erm, did this get applied without anyone actually trying to compile
samples? I'm getting build errors as:

  CC  /home/build/linux/samples/bpf/xsk_fwd.o
/home/build/linux/samples/bpf/xsk_fwd.c: In function ‘swap_mac_addresses’:
/home/build/linux/samples/bpf/xsk_fwd.c:658:9: warning: implicit declaration of function ‘swap’; did you mean ‘swab’? [-Wimplicit-function-declaration]
  658 |         swap(*src_addr, *dst_addr);
      |         ^~~~
      |         swab

/usr/bin/ld: /home/build/linux/samples/bpf/xsk_fwd.o: in function `thread_func':
xsk_fwd.c:(.text+0x440): undefined reference to `swap'
collect2: error: ld returned 1 exit status


Could we maybe get samples/bpf added to the BPF CI builds? :)

-Toke