reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        git checkout fbfb8031533c924c2f3fef73759b4cf75a0e6aa7
        # 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/acpi/nfit/ drivers/iommu/ drivers/net/ethernet/huawei/hinic/ drivers/net/ethernet/pensando/ionic/ drivers/scsi/mpt3sas/ drivers/scsi/qla2xxx/ drivers/scsi/smartpqi/ fs/ceph/ kernel/ mm/ net/ceph/