Re: [next] arm: panel-edp.c:(.text+0xb74): undefined reference to `drm_panel_dp_aux_backlight'

On Wed, 2 Feb 2022 at 10:08, Thomas Zimmermann tzimmermann@suse.de wrote:

Hi

Am 02.02.22 um 10:02 schrieb Naresh Kamboju:

...

Following builds failed on Linux next 20220202 arm architecture.

• arm-gcc-10-omap2plus_defconfig
• arm-clang-nightly-shmobile_defconfig
• arm-gcc-8-lpc32xx_defconfig
• arm-clang-13-shmobile_defconfig
• arm-gcc-10-shmobile_defconfig
• arm-clang-11-shmobile_defconfig
• arm-clang-11-omap2plus_defconfig
• arm-clang-13-omap2plus_defconfig
• arm-clang-11-lpc32xx_defconfig
• arm-gcc-8-omap2plus_defconfig
• arm-gcc-9-vexpress_defconfig
• arm-clang-nightly-lpc32xx_defconfig
• arm-gcc-9-shmobile_defconfig
• arm-clang-13-lpc32xx_defconfig
• arm-gcc-10-sama5_defconfig
• arm-clang-11-vexpress_defconfig
• arm-clang-11-sama5_defconfig
• arm-gcc-9-omap2plus_defconfig
• arm-clang-nightly-sama5_defconfig
• arm-clang-13-vexpress_defconfig
• arm-clang-nightly-vexpress_defconfig
• arm-gcc-9-lpc32xx_defconfig
• arm-clang-12-vexpress_defconfig
• arm-gcc-10-vexpress_defconfig
• arm-clang-12-shmobile_defconfig
• arm-gcc-11-omap2plus_defconfig
• arm-gcc-9-sama5_defconfig
• arm-gcc-8-shmobile_defconfig
• arm-gcc-10-lpc32xx_defconfig
• arm-clang-12-omap2plus_defconfig
• arm-gcc-8-vexpress_defconfig
• arm-clang-12-sama5_defconfig
• arm-clang-nightly-omap2plus_defconfig
• arm-gcc-11-lpc32xx_defconfig
• arm-gcc-11-sama5_defconfig
• arm-gcc-11-shmobile_defconfig
• arm-gcc-11-vexpress_defconfig
• arm-gcc-8-sama5_defconfig
• arm-clang-13-sama5_defconfig
• arm-clang-12-lpc32xx_defconfig

make --silent --keep-going --jobs=8 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- 'CC=sccache arm-linux-gnueabihf-gcc' 'HOSTCC=sccache gcc' vexpress_defconfig make --silent --keep-going --jobs=8 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- 'CC=sccache arm-linux-gnueabihf-gcc' 'HOSTCC=sccache gcc' arm-linux-gnueabihf-ld: drivers/gpu/drm/panel/panel-edp.o: in function `panel_edp_probe': panel-edp.c:(.text+0xb74): undefined reference to `drm_panel_dp_aux_backlight' make[1]: *** [/builds/linux/Makefile:1222: vmlinux] Error 1

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

meta data:

 git describe: next-20220202
 git_repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
 target_arch: arm
 kconfig: vexpress_defconfig
 toolchain: gcc-11

Build log:

https://builds.tuxbuild.com/24XRim72vFXix6l6MdAJNENy6je/

Steps to reproduce:

# To install tuxmake on your system globally: # sudo pip3 install -U tuxmake # # See https://docs.tuxmake.org/ for complete documentation. # Original tuxmake command with fragments listed below.

tuxmake --runtime podman --target-arch arm --toolchain gcc-11 --kconfig vexpress_defconfig

tuxmake --runtime podman --target-arch arm --toolchain gcc-11 --kconfig https://builds.tuxbuild.com/24XRim72vFXix6l6MdAJNENy6je/config

You'll now need

CONFIG_DRM_DP_HELPER=y

in your config.

That should never be the solution for linker errors such as this one.

If CONFIG_DRM_PANEL_EDP relies on something provided by CONFIG_DRM_DP_HELPER, it should select it or depend on it in Kconfig.