8#define MOD_INC_USE_COUNT (usecount = usecount + 1)
9#define MOD_DEC_USE_COUNT (usecount = usecount - 1)
10#define MOD_IN_USE (usecount != 0)
13#define MAJOR_NUMBER 42
int register_chrdev(unsigned int, const char *)
int unregister_chrdev(unsigned int, const char *)