extern struct rb_root key_serial_tree;
extern spinlock_t key_serial_lock;
-extern struct semaphore key_alloc_sem;
extern struct mutex key_construction_mutex;
extern wait_queue_head_t request_key_conswq;
extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
+extern int install_user_keyrings(struct task_struct *tsk);
extern int install_thread_keyring(struct task_struct *tsk);
extern int install_process_keyring(struct task_struct *tsk);