make: Entering directory `/usr/src/linux-headers-4.4.0-142-generic'
  CC [M]  /home/user/kernrk/kernrk.o
/home/user/kernrk/kernrk.c:51:5: warning: initialization from incompatible pointer type [enabled by default]
     .pre_handler = getdents_post_handler,
     ^
/home/user/kernrk/kernrk.c:51:5: warning: (near initialization for ‘kp.pre_handler’) [enabled by default]