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

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Message-ID: <CACRpkdaK+8bropqoRCaEw6KH7ZKRHUwNBPtc-cOojJZt+3S+yw@mail.gmail.com>
Date:   Fri, 26 Aug 2022 21:59:34 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>,
        Noralf Trønnes <noralf@...nnes.org>
Subject: Re: ld.lld: error: undefined symbol: drm_gem_fb_get_obj

On Fri, Aug 26, 2022 at 5:48 PM Doug Anderson <dianders@...omium.org> wrote:

> Unfortunately, fixing the error isn't the most trivial thing in the
> world. If you just do this:
>
>  config DRM_MIPI_DBI
>         tristate
> +       select DRM_KMS_HELPER
>         depends on DRM
>
> ...then you get a circular dependency:
>
> drivers/gpu/drm/Kconfig:76:error: recursive dependency detected!
> drivers/gpu/drm/Kconfig:76:     symbol DRM_KMS_HELPER is selected by
> DRM_MIPI_DBI
> drivers/gpu/drm/Kconfig:31:     symbol DRM_MIPI_DBI is selected by
> DRM_PANEL_ILITEK_ILI9341
> drivers/gpu/drm/panel/Kconfig:165:      symbol
> DRM_PANEL_ILITEK_ILI9341 depends on DRM_KMS_HELPER
> For a resolution refer to Documentation/kbuild/kconfig-language.rst
> subsection "Kconfig recursive dependency limitations"

It turns out Randy Dunlap had made the right fixes, and I merged them
before you got the chance to reply!

https://cgit.freedesktop.org/drm/drm-misc/commit/?id=84dfc46594b0167e5d3736273b0e0e05365da641
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=eb7de496451bd969e203f02f66585131228ba4ae

But thanks!

Yours,
Linus Walleij