linux-kernel - ld.lld: error: undefined symbol: backlight_device_get_by

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Date:   Mon, 10 Oct 2022 19:41:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arun R Murthy <arun.r.murthy@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: ld.lld: error: undefined symbol: backlight_device_get_by_name

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   493ffd6605b2d3d4dc7008ab927dba319f36671f
commit: 868e8e5156a1f8d92ca83fdbac6fd52798650792 drm/i915/display: avoid warnings when registering dual panel backlight
date:   7 weeks ago
config: i386-buildonly-randconfig-r005-20221010
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=868e8e5156a1f8d92ca83fdbac6fd52798650792
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 868e8e5156a1f8d92ca83fdbac6fd52798650792
        # 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=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: backlight_device_get_by_name
   >>> referenced by intel_backlight.c:974 (drivers/gpu/drm/i915/display/intel_backlight.c:974)
   >>>               gpu/drm/i915/display/intel_backlight.o:(intel_backlight_device_register) in archive drivers/built-in.a

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

View attachment "config" of type "text/plain" (139436 bytes)