reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=ae83f3b72621bd3187eb7956c7c2993a97d4b187
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout ae83f3b72621bd3187eb7956c7c2993a97d4b187

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # apt-get install sparse
        # sparse version: v0.6.4-73-gfbdde312

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/acpi/ drivers/char/tpm/ drivers/cpufreq/ drivers/gpu/drm/sysfb/ drivers/hwmon/ drivers/iio/accel/ drivers/iio/adc/ drivers/iio/gyro/ drivers/iio/imu/st_lsm9ds0/ drivers/iio/light/ drivers/iio/trigger/ drivers/input/keyboard/ drivers/input/misc/ drivers/mtd/devices/ drivers/platform/chrome/ drivers/power/supply/ drivers/pps/generators/ drivers/video/fbdev/ lib/ samples/tsm-mr/ samples/vfio-mdev/