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

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Date:   Sat, 11 Dec 2021 19:07:48 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     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>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, kernel@...o.com
Subject: Re: [PATCH v2] samples/bpf: xdpsock: fix swap.cocci warning

Andrii Nakryiko <andrii.nakryiko@...il.com> writes:

> On Fri, Dec 10, 2021 at 6:26 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>>
>> 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:
>
> Good news: I actually do build samples/bpf nowadays after fixing a
> bunch of compilation issues recently.

Awesome!

> Bad news: seems like I didn't pay too much attention after building
> samples/bpf for this particular patch, sorry about that. I've dropped
> this patch, samples/bpf builds for me. We should be good now.

Yup, looks good, thanks!

>>   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? :)
>
> Maybe we could, if someone dedicated their effort towards making this
> happen.

Is it documented anywhere what that would entail? Is it just a matter of
submitting a change to https://github.com/kernel-patches/vmtest ?

-Toke