linux-kernel - Re: [PATCH] selftests/bpf: fix warning comparing pointer to 0

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Message-ID: <CANoWsw=ga1G6_XPhWmvE5QgUmmOVOEVzX_0HDYF9BZagvKD+Tw@mail.gmail.com>
Date:   Wed, 10 Mar 2021 11:31:56 +0200
From:   Yauheni Kaliuta <ykaliuta@...hat.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     shuah <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, andrii@...nel.org,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john.fastabend@...il.com, kpsingh@...nel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, netdev@...r.kernel.org,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/bpf: fix warning comparing pointer to 0

On Wed, Mar 10, 2021 at 8:23 AM Jiapeng Chong
<jiapeng.chong@...ux.alibaba.com> wrote:
>
> Fix the following coccicheck warning:
>
> ./tools/testing/selftests/bpf/progs/test_global_func10.c:17:12-13:
> WARNING comparing pointer to 0.

but it's ok from the C standard point of view

>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
>  tools/testing/selftests/bpf/progs/test_global_func10.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/test_global_func10.c b/tools/testing/selftests/bpf/progs/test_global_func10.c
> index 61c2ae9..97b7031 100644
> --- a/tools/testing/selftests/bpf/progs/test_global_func10.c
> +++ b/tools/testing/selftests/bpf/progs/test_global_func10.c
> @@ -14,7 +14,7 @@ struct Big {
>
>  __noinline int foo(const struct Big *big)
>  {
> -       if (big == 0)
> +       if (!big)
>                 return 0;
>
>         return bpf_get_prandom_u32() < big->y;
> --
> 1.8.3.1
>


-- 
WBR, Yauheni