Linux内核模块copy_to_user无法正常工作

I am attepting to write a Linux Kernel Module for the Raspberry Pi. All is good, except that when I try to use either copy_to_user, or put_user, it always returns a value of "34336" if I print it as an llu, and if I print it as a character, it is nothing.I am attepting to write a Linux Kernel Module f