linux-kernel - Re: [PATCH] selftests/bpf: ignore pointer types check with clang

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Date:   Thu, 13 Apr 2023 21:56:00 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrea Righi <andrea.righi@...onical.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>,
        Shuah Khan <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Paolo Pisati <paolo.pisati@...onical.com>,
        bpf <bpf@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/bpf: ignore pointer types check with clang

On Wed, Apr 12, 2023 at 2:59 AM Andrea Righi <andrea.righi@...onical.com> wrote:
>
> Building bpf selftests with clang can trigger errors like the following:
>
>   CLNG-BPF [test_maps] bpf_iter_netlink.bpf.o
> progs/bpf_iter_netlink.c:32:4: error: incompatible pointer types assigning to 'struct sock *' from 'struct sock___17 *' [-Werror,-Wincompatible-pointer-types]
>         s = &nlk->sk;
>           ^ ~~~~~~~~
> 1 error generated.

I cannot reproduce this and BPF CI doesn't complain about it either.
What kind of clang do you use?
Some special version and build flags?