reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/zen-kernel/zen-kernel/commit/233cb867f9692c48ca88defda0ce015cd43ef5dd
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 6.7/main
        git checkout 233cb867f9692c48ca88defda0ce015cd43ef5dd
        # 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=i386 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=i386 SHELL=/bin/bash kernel/sched/