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

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Date:   Fri, 14 Apr 2023 08:15:03 +0200
From:   Andrea Righi <andrea.righi@...onical.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.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 Thu, Apr 13, 2023 at 09:56:00PM -0700, Alexei Starovoitov wrote:
> 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?

I'm using Ubuntu clang version 15.0.7 (Ubuntu 23.04), no special build
flag (unless Ubuntu enables some different default flags, but it
shouldn't be the case... I'll double check).

-Andrea