include/linux/rcupdate.h

629  * code demarked by rcu_read_lock() and rcu_read_unlock().  This means
645  * regions of code demarked by rcu_read_lock() and rcu_read_unlock().
726  *	rcu_read_unlock();
745  * and rcu_read_unlock() are guaranteed to be waited for.
797  * rcu_read_unlock() - marks the end of an RCU read-side critical section.
799  * In almost all situations, rcu_read_unlock() is immune from deadlock.
804  * out when rcu_read_unlock() is invoked with interrupts disabled.
808 static inline void rcu_read_unlock(void)
811 			 "rcu_read_unlock() used illegally while idle");
1093 DEFINE_LOCK_GUARD_0(rcu, rcu_read_lock(), rcu_read_unlock())