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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index c577cadcc4f878b70524d00f84185a68937a054a..770f0df5401587f3199c02e5444ed81ff4681adc 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2317,8 +2317,9 @@ 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,
-                                     struct rcu_node *rnp, unsigned long flags)
+static void __maybe_unused
+rcu_report_unblock_qs_rnp(struct rcu_state *rsp,
+                         struct rcu_node *rnp, unsigned long flags)
        __releases(rnp->lock)
 {
        unsigned long gps;
@@ -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;
                }