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

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

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@intel.com>
>>
>> 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@pendragon.ideasonboard.com/T/#t
> 
> Cheers,
> Biju
>