netdev - Re: [PATCH v2 bpf-next 15/17] selftests/bpf: add function linking selftest

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Message-ID: <CAADnVQKjasq6sf_AFjGOkoWCeZ5_SJTYzuvWb_byHe32FHS5Vw@mail.gmail.com>
Date:   Thu, 22 Apr 2021 19:34:57 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 15/17] selftests/bpf: add function linking selftest

On Thu, Apr 22, 2021 at 5:51 PM Yonghong Song <yhs@...com> wrote:
> > +
> > +/* weak and shared between two files */
> > +const volatile int my_tid __weak = 0;
> > +const volatile long syscall_id __weak = 0;
>
> Since the new compiler (llvm13) is recommended for this patch set.
> We can simplify the above two definition with
>    int my_tid __weak;
>    long syscall_id __weak;
> The same for the other file.
>
> But I am also okay with the current form
> to *satisfy* llvm10 some people may still use.

The test won't work with anything, but the latest llvm trunk,
so " = 0" is useless.
Let's remove it.
Especially from the tests that rely on the latest llvm.
No one can backport the latest llvm BPF backend to llvm10 front-end.