Commit a824a287 authored Apr 19, 2018 by Paul E. McKenney

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@linux.vnet.ibm.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>

parent a508aa59

kernel/rcu/tree.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}