linux-kernel - [PATCH tip/core/rcu 19/52] rcu: Remove rsp parameter from __note_gp

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Message-Id: <20180829223854.4055-19-paulmck@linux.vnet.ibm.com>
Date:   Wed, 29 Aug 2018 15:38:21 -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@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 19/52] rcu: Remove rsp parameter from __note_gp_changes()

There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions.  This commit therefore removes the rsp parameter from
__note_gp_changes().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index dae8c1ad6a9e..4dd9d68af702 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1757,11 +1757,11 @@ static bool rcu_advance_cbs(struct rcu_node *rnp, struct rcu_data *rdp)
  * structure corresponding to the current CPU, and must have irqs disabled.
  * Returns true if the grace-period kthread needs to be awakened.
  */
-static bool __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp,
-			      struct rcu_data *rdp)
+static bool __note_gp_changes(struct rcu_node *rnp, struct rcu_data *rdp)
 {
 	bool ret;
 	bool need_gp;
+	struct rcu_state __maybe_unused *rsp = &rcu_state;
 
 	raw_lockdep_assert_held_rcu_node(rnp);
 
@@ -1814,7 +1814,7 @@ static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp)
 		local_irq_restore(flags);
 		return;
 	}
-	needwake = __note_gp_changes(rsp, rnp, rdp);
+	needwake = __note_gp_changes(rnp, rdp);
 	raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
 	if (needwake)
 		rcu_gp_kthread_wake();
@@ -1939,7 +1939,7 @@ static bool rcu_gp_init(struct rcu_state *rsp)
 		rnp->qsmask = rnp->qsmaskinit;
 		WRITE_ONCE(rnp->gp_seq, rsp->gp_seq);
 		if (rnp == rdp->mynode)
-			(void)__note_gp_changes(rsp, rnp, rdp);
+			(void)__note_gp_changes(rnp, rdp);
 		rcu_preempt_boost_start_gp(rnp);
 		trace_rcu_grace_period_init(rsp->name, rnp->gp_seq,
 					    rnp->level, rnp->grplo,
@@ -2050,7 +2050,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
 		WRITE_ONCE(rnp->gp_seq, new_gp_seq);
 		rdp = this_cpu_ptr(&rcu_data);
 		if (rnp == rdp->mynode)
-			needgp = __note_gp_changes(rsp, rnp, rdp) || needgp;
+			needgp = __note_gp_changes(rnp, rdp) || needgp;
 		/* smp_mb() provided by prior unlock-lock pair. */
 		needgp = rcu_future_gp_cleanup(rnp) || needgp;
 		sq = rcu_nocb_gp_get(rnp);
-- 
2.17.1