tools/testing/radix-tree/linux/lockdep.h

#ifndef _LINUX_LOCKDEP_H
#define _LINUX_LOCKDEP_H
struct lock_class_key {
	unsigned int a;
};

static inline void lockdep_set_class(spinlock_t *lock,
					struct lock_class_key *key)
{
}
#endif /* _LINUX_LOCKDEP_H */