Commit-ID: a824a287f6eaec65f1cf7aedfd5f6b69d2d3858f
Gitweb: https://git.kernel.org/tip/a824a287f6eaec65f1cf7aedfd5f6b69d2d3858f
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 19 Apr 2018 09:40:32 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 15 May 2018 10:30:20 -0700
rcu: Clear request other than RCU_GP_FLAG_INIT at GP end
Once the grace period has ended, any RCU_GP_FLAG_FQS requests are
irrelevant: The grace period has ended, so there is no longer any
point in forcing quiescent states in order to try to make it end sooner.
This commit therefore causes rcu_gp_cleanup() to clear any bits other
than RCU_GP_FLAG_INIT from ->gp_flags at the end of the grace period.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Tested-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
kernel/rcu/tree.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index c7b1e6b2a3da..25dbbc753fef 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2181,6 +2181,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
READ_ONCE(rsp->gpnum),
TPS("newreq"));
}
+ WRITE_ONCE(rsp->gp_flags, rsp->gp_flags & RCU_GP_FLAG_INIT);
raw_spin_unlock_irq_rcu_node(rnp);
}
--
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