linux-lab 错误

错误：

/labs/linux-lab/linux-stable is not clean, please run 'make mrproper'
  in the '/labs/linux-lab/linux-stable' directory.
make[3]: *** [prepare3] Error 1
make[2]: *** [sub-make] Error 2
make[1]: *** [kernel-modules-km] Error 2

解决：

pushd linux-stable
make mrproper
popd