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

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Message-ID: <q5rj72tmwlpzx6qgkromem5t7q6xmen52aavfr65olnuv52f3z@wzs4p3xz3635>
Date:   Fri, 14 Apr 2023 18:15:38 +0200
From:   Ilya Leoshkevich <iii@...ux.ibm.com>
To:     Andrea Righi <andrea.righi@...onical.com>,
        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 Fri, Apr 14, 2023 at 08:15:03AM +0200, Andrea Righi wrote:
> 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

Hi,

FWIW, I see similar errors when I don't use recent pahole.

Best regards,
Ilya