linux-kernel - Re: ld.lld: error: undefined symbol: amba_driver

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Message-ID: <20201029193052.GA389163@kozik-lap>
Date:   Thu, 29 Oct 2020 20:30:52 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: ld.lld: error: undefined symbol: amba_driver_register

On Thu, Oct 29, 2020 at 12:28:54PM -0700, Nick Desaulniers wrote:
> On Wed, Oct 28, 2020 at 9:57 PM kernel test robot <lkp@...el.com> wrote:
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   23859ae44402f4d935b9ee548135dd1e65e2cbf4
> > commit: ea0c0ad6b6eb36726088991d97a55b99cae456d0 memory: Enable compile testing for most of the drivers
> > date:   2 months ago
> > config: arm-randconfig-r024-20201028 (attached as .config)
> 
> ^ Note, this was a randconfig, so the preprocessor guards on CONFIGs
> might be wrong.

The report looks correct. It's possible to craft ARM config without
ARM_AMBA which would cause this issue. I have a fix ready.

Best regards,
Krzysztof