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rcu: Clear request other than RCU_GP_FLAG_INIT at GP end

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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>
This commit is contained in:
Paul E. McKenney 2018-04-19 09:40:32 -07:00
parent a508aa597e
commit a824a287f6
1 changed files with 1 additions and 0 deletions
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kernel/rcu/tree.c
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@ -2181,6 +2181,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
READ_ONCE(rsp->gpnum), READ_ONCE(rsp->gpnum),
TPS("newreq")); TPS("newreq"));
} }
WRITE_ONCE(rsp->gp_flags, rsp->gp_flags & RCU_GP_FLAG_INIT);
raw_spin_unlock_irq_rcu_node(rnp); raw_spin_unlock_irq_rcu_node(rnp);
} }