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From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Mon, 7 Dec 2020 09:53:55 +0100
Message-ID: <CAMj1kXGUxTf_Mezgna0S1LAQ4ANMHtCqUqc995NPwAiOp+-6Eg@mail.gmail.com>
Subject: Re: [PATCH] kbuild: avoid static_assert for genksyms
To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Arnd Bergmann <arnd@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Arnd Bergmann <arnd@arndb.de>, stable <stable@vger.kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Rikard Falkeborn <rikard.falkeborn@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sun, 6 Dec 2020 at 03:49, Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Fri, Dec 4, 2020 at 8:10 AM Arnd Bergmann <arnd@kernel.org> wrote:
> >
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > genksyms does not know or care about the _Static_assert() built-in,
> > and sometimes falls back to ignoring the later symbols, which causes
> > undefined behavior such as
> >
> > WARNING: modpost: EXPORT symbol "ethtool_set_ethtool_phy_ops" [vmlinux] version generation failed, symbol will not be versioned.
> > ld: net/ethtool/common.o: relocation R_AARCH64_ABS32 against `__crc_ethtool_set_ethtool_phy_ops' can not be used when making a shared object
> > net/ethtool/common.o:(_ftrace_annotated_branch+0x0): dangerous relocation: unsupported relocation
> >
> > Redefine static_assert for genksyms to avoid that.
>
>
> Please tell the CONFIG options needed to reproduce this.
> I do not see it.
>

https://people.linaro.org/~ard.biesheuvel/randconfig-modversions-error