kernel/rcu/tree_plugin.h

267 	 * Report the quiescent state for the expedited GP.  This expedited  in rcu_preempt_ctxt_queue()
270 	 * still in a quiescent state in any case.)  in rcu_preempt_ctxt_queue()
281  * Record a preemptible-RCU quiescent state for the specified CPU.
283  * on the CPU is in a quiescent state:  Instead, it means that the current
291  * Unlike non-preemptible-RCU, quiescent state reports for expedited
292  * grace periods are handled separately via deferred quiescent states
361 	 * globally.  Either way, we can now note a quiescent state  in rcu_note_context_switch()
472  * Report deferred quiescent states.  The deferral time can
512 	 * quiescent state from this CPU.  Note that requests from  in rcu_preempt_deferred_qs_irqrestore()
555 		 * we aren't waiting on any CPUs, report the quiescent state.  in rcu_preempt_deferred_qs_irqrestore()
589  * Is a deferred quiescent-state pending, and are we also not in
591  * to ensure it is otherwise safe to report any deferred quiescent
593  * quiescent state during context switch even though preemption
605  * Report a deferred quiescent state if needed and safe to do so.
661 		// Need to defer quiescent state until everything is enabled.  in rcu_read_unlock_special()
724  * Check for a quiescent state from the current CPU, including voluntary
727  * elsewhere, hence this function need only check for quiescent states
828  * __rcu_read_unlock() marks the beginning of a quiescent state, immediately
829  * report that quiescent state and, if requested, spin for a bit.
854  * Note a quiescent state for PREEMPTION=n.  Because we do not need to know
855  * how many quiescent states passed, just if there was at least one since
872  * Register an urgently needed quiescent state.  If there is an
874  * dyntick-idle quiescent state visible to other CPUs, which will in
876  * Either way, register a lightweight quiescent state.
938  * Because there is no preemptible RCU, there can be no deferred quiescent
947 // grace period for a quiescent state from this CPU.  Note that in
951 // actually check it.  Instead, a quiescent state from this CPU suffices,
952 // and this function is only called from such a quiescent state.
972  * Check to see if this CPU is in a non-context-switch quiescent state,
983 		 * a quiescent state, so note it.  in rcu_flavor_sched_clock_irq()