reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://git.kernel.org/pub/scm/linux/kernel/git/hare/nvme.git/commit/?id=c85200aaab7f1248dd0142da172df0047ddbb812
        git remote add hare-nvme https://git.kernel.org/pub/scm/linux/kernel/git/hare/nvme.git
        git fetch --no-tags hare-nvme secure-concat.v5
        git checkout c85200aaab7f1248dd0142da172df0047ddbb812
        # 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 drivers/nvme/host/