reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        git checkout 555c45fe0d04bd817e245a125d242b6a86af4593
        # 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/gpu/drm/i915/ drivers/iommu/ drivers/net/ethernet/ drivers/pci/controller/ drivers/scsi/mpt3sas/ drivers/scsi/qla2xxx/ drivers/scsi/smartpqi/ drivers/thermal/intel/int340x_thermal/ fs/ceph/ kernel/ mm/ net/ceph/