单编kernel提示kernel/msm-4.9/Makefile:1154: recipe for target ‘prepare3‘ failed

我在单编kernel 模块的时候用错了单编命令，然后用Ctrl+C 方式强制终止编译。然后后面在编译就会报如下错误：

Using /home/ator/workspace/projects/alphard11_git/kernel/msm-4.9 as source for kernel
  /home/ator/workspace/projects/alphard11_git/kernel/msm-4.9 is not clean, please run 'make mrproper'
  in the '/home/ator/workspace/projects/alphard11_git/kernel/msm-4.9' directory.
/home/ator/workspace/projects/alphard11_git/kernel/msm-4.9/Makefile:1154: recipe for target 'prepare3' failed
make[1]: *** [prepare3] Error 1
make[1]: Leaving directory '/home/ator/workspace/projects/alphard11_git/out/target/product/msm8937_32go/obj/kernel/msm-4.9'
Makefile:152: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
make: Leaving directory '/home/ator/workspace/projects/alphard11_git/kernel/msm-4.9'
ninja: build stopped: subcommand failed.
16:22:02 ninja failed with: exit status 1

根据提示编译窗口提示：

/home/ator/workspace/projects/alphard11_git/kernel/msm-4.9 is not clean, please run 'make mrproper'
  in the '/home/ator/workspace/projects/alphard11_git/kernel/msm-4.9' directory.

   make mrproper(一定在上述提示路径执行kernel/msm-4.9') 再进行编译，问题解决，原因是srctree不干净了

ator@ator-hp-prodesk-680-g4-mt:~/workspace/projects/alphard11_git/kernel/msm-4.9$ make mrproper
Restriction Checker not present, skipping..
Skipping vendor HAL hidl-gen - no changes detected
  CLEAN   scripts/basic
  CLEAN   scripts/kconfig
  CLEAN   include/config include/generated

#### build completed successfully (14 seconds) ####