__class_create — create a struct class structure
| struct class * __class_create ( | struct module * owner, | 
| const char * name, | |
| struct lock_class_key * key ); | 
ownerpointer to the module that is to “own” this struct class
namepointer to a string for the name of this class.
keythe lock_class_key for this class; used by mutex lock debugging
   This is used to create a struct class pointer that can then be used
   in calls to device_create.
   
   Returns struct class pointer on success, or ERR_PTR on error.
   
   Note, the pointer created here is to be destroyed when finished by
   making a call to class_destroy.