reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-61-g09411a7a-dirty
        # https://github.com/jcmvbkbc/linux-xtensa/commit/45f979e707835f557c2e8a0403e7338bf0f67472
        git remote add jcmvbkbc-xtensa https://github.com/jcmvbkbc/linux-xtensa
        git fetch --no-tags jcmvbkbc-xtensa xtensa-6.8-rc2-esp32
        git checkout 45f979e707835f557c2e8a0403e7338bf0f67472
        # 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/net/wireless/espressif/esp32-ng/