reproduce (this is a W=1 build):
        # https://github.com/projectacrn/acrn-kernel/commit/f8aee7a312dbbc04e1f182a7a43bd55dfb092292
        git remote add acrn https://github.com/projectacrn/acrn-kernel
        git fetch --no-tags acrn 6.17/linux
        git checkout f8aee7a312dbbc04e1f182a7a43bd55dfb092292
        # apt-get install sparse
        # sparse: v0.6.5-rc1

        # 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/virt/acrn/