Re: [linux-next:master 5636/9540] ld.lld: error: undefined symbol: drm_of_get_data_lanes_count_ep

["Chen, Rong A" <rong.a.chen@xxxxxxxxx>]

On 11/22/2022 11:17 PM, Biju Das wrote:
> Hi kernel test robot,
>
> > Subject: [linux-next:master 5636/9540] ld.lld: error: undefined symbol:
> > drm_of_get_data_lanes_count_ep
> >
> > tree:
> >
> > head:   771a207d1ee9f38da8c0cee1412228f18b900bac
> > commit: 7a043f978ed1433bddb088a732e9bb91501ebd76 [5636/9540] drm: rcar-
> > du: Add RZ/G2L DSI driver
> > config: arm64-randconfig-r026-20221122
> > compiler: clang version 16.0.0
> > reproduce (this is a W=1 build):
> >          wget
> -O ~/bin/make.cross
> >          chmod +x ~/bin/make.cross
> >          # install arm64 cross compiling tool for clang build
> >          # apt-get install binutils-aarch64-linux-gnu
> >          #
> >          git remote add linux-next
> >          git fetch --no-tags linux-next master
> >          git checkout 7a043f978ed1433bddb088a732e9bb91501ebd76
> >          # save the config file
> >          mkdir build_dir && cp config build_dir/.config
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1
> > O=build_dir ARCH=arm64 SHELL=/bin/bash
> >
> > If you fix the issue, kindly add following tag where applicable
> > | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >
> > All errors (new ones prefixed by >>):
> >
> > > > ld.lld: error: undefined symbol: drm_of_get_data_lanes_count_ep
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_probe) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol: drm_bridge_attach
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_attach) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol:
> > drm_atomic_get_new_connector_for_encoder
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_atomic_enable) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol: devm_drm_of_get_bridge
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_host_attach) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol: drm_bridge_add
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_host_attach) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol: drm_bridge_remove
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_host_detach) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol:
> > drm_atomic_helper_bridge_duplicate_state
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_bridge_ops) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol:
> > drm_atomic_helper_bridge_destroy_state
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_bridge_ops) in archive vmlinux.a
> > --
> > > > ld.lld: error: undefined symbol: drm_atomic_helper_bridge_reset
> >     >>> referenced by rzg2l_mipi_dsi.c
> >     >>>               drivers/gpu/drm/rcar-
> > du/rzg2l_mipi_dsi.o:(rzg2l_mipi_dsi_bridge_ops) in archive vmlinux.a
>
> I was able to reproduce the issue and the same fix[1], will fix the issue
> here for clang compiler as well. Can you please apply [1] to avoid
> repeatedly sending the same issue for different compilers on the kernel test robot?

Hi Biju,

Thanks for your advice, we'll add it to ignore list.

Best Regards,
Rong Chen

> [1] https://lore.kernel.org/linux-renesas-soc/Y3wVLU01mHp2zozI@xxxxxxxxxxxxxxxxxxxxxxxxxx/T/#t
>
> Cheers,
> Biju