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Date: Sun, 22 Apr 2018 20:03:36 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com, oleg@...hat.com, joel.opensrc@...il.com, torvalds@...ux-foundation.org, npiggin@...il.com, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Subject: [PATCH tip/core/rcu 13/21] 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@...ux.vnet.ibm.com> --- 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); } -- 2.5.2
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