reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d155030b1e7c0e448aab22a803f7a71ea2e117d7
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d155030b1e7c0e448aab22a803f7a71ea2e117d7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/cpu/sgx/ arch/x86/lib/ drivers/gpu/drm/msm/ drivers/scsi/lpfc/ drivers/scsi/qla2xxx/ drivers/staging/ fs/dlm/ fs/nfsd/ sound/soc/amd/