make: Entering directory `/usr/src/linux-headers-4.4.0-142-generic'
CC [M] /home/user/kernrk/kernrk.o
/home/user/kernrk/kernrk.c: In function ‘entry_handler’:
/home/user/kernrk/kernrk.c:22:21: warning: unused variable ‘data’ [-Wunused-variable]
struct my_data *data = (struct my_data *)ri->data;
^
/home/user/kernrk/kernrk.c: In function ‘ret_handler’:
/home/user/kernrk/kernrk.c:69:5: error: implicit declaration of function ‘regs_set_return_value’ [-Werror=implicit-function-declaration]
regs_set_return_value(regs, new_nread); // update return value to new_nread
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