reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/robertosassu/linux/commit/49621962de7e9bad18b99e21dcb8b32f5af7b61e
        git remote add robertosassu https://github.com/robertosassu/linux
        git fetch --no-tags robertosassu evm-fscaps-v2
        git checkout 49621962de7e9bad18b99e21dcb8b32f5af7b61e
        # 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 net/sched/ security/