extern void
get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
extern void
get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);