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Commit 17a8212b authored by Paul E. McKenney's avatar Paul E. McKenney
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rcu: Remove failsafe check for lost quiescent state 



Now that quiescent-state reporting is fully event-driven, this commit
removes the check for a lost quiescent state from force_qs_rnp().

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent f34f2f58

kernel/rcu/tree.c

+3 −13
Original line number Diff line number Diff line
@@ -2317,7 +2317,8 @@ rcu_report_qs_rnp(unsigned long mask, struct rcu_state *rsp, 
 * irqs disabled, and this lock is released upon return, but irqs remain

 * disabled.

 */

static void rcu_report_unblock_qs_rnp(struct rcu_state *rsp,

static void __maybe_unused

rcu_report_unblock_qs_rnp(struct rcu_state *rsp,

			  struct rcu_node *rnp, unsigned long flags)

	__releases(rnp->lock)

{
@@ -2679,17 +2680,6 @@ static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *rsp)) 
				/* rcu_initiate_boost() releases rnp->lock */

				continue;

			}

			if (rnp->parent &&

			    (rnp->parent->qsmask & rnp->grpmask)) {

				/*

				 * Race between grace-period

				 * initialization and task exiting RCU

				 * read-side critical section: Report.

				 */

				rcu_report_unblock_qs_rnp(rsp, rnp, flags);

				/* rcu_report_unblock_qs_rnp() rlses ->lock */

				continue;

			}

			raw_spin_unlock_irqrestore_rcu_node(rnp, flags);

			continue;

		}