reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://git.kernel.org/pub/scm/linux/kernel/git/pali/linux.git/commit/?id=5801c666d8325f01e5ab138fd3a0f8760df43f21
        git remote add pali https://git.kernel.org/pub/scm/linux/kernel/git/pali/linux.git
        git fetch --no-tags pali cifs
        git checkout 5801c666d8325f01e5ab138fd3a0f8760df43f21
        # 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 fs/smb/client/