reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=63ef02da5ddb725555cd41f125ec0bd8e893da3a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 63ef02da5ddb725555cd41f125ec0bd8e893da3a

        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/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=arm64 SHELL=/bin/bash drivers/char/hw_random/ drivers/clk/hisilicon/ drivers/clk/mmp/ drivers/cpufreq/ drivers/crypto/hisilicon/ drivers/edac/ drivers/firmware/arm_scmi/transports/ drivers/hwtracing/coresight/ drivers/i2c/busses/ drivers/interconnect/qcom/ drivers/irqchip/ drivers/mailbox/ drivers/mtd/parsers/ drivers/pci/controller/dwc/ drivers/perf/ drivers/pinctrl/ drivers/remoteproc/ drivers/rtc/ drivers/soc/hisilicon/ drivers/staging/fbtft/ drivers/watchdog/