Commit-ID: 17a8212b8de21ce1b9a91fb75c8a6fb337685b9a
Gitweb: https://git.kernel.org/tip/17a8212b8de21ce1b9a91fb75c8a6fb337685b9a
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 3 May 2018 14:30:02 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 12 Jul 2018 15:39:06 -0700
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@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 16 +++-------------
1 file changed, 3 insertions(+), 13 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index c577cadcc4f8..770f0df54015 100644
--- 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;
}
--
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