reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/jsarha/linux/commit/bc7304877066a781782a7b43ea0ed2edcc767637
        git remote add jsarha https://github.com/jsarha/linux
        git fetch --no-tags jsarha topic/chromeos-4.19-s0ix
        git checkout bc7304877066a781782a7b43ea0ed2edcc767637
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 olddefconfig
        make 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/nvme/host/