linux-kernel - [PATCH tip/core/rcu 33/52] rcu: Remove rsp parameter from rcu_init

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Date:   Wed, 29 Aug 2018 15:38:35 -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 33/52] rcu: Remove rsp parameter from rcu_init_one() and friends

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
rcu_init_one() and rcu_dump_rcu_node_tree().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 3591633efc33..6183c2889a9f 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3707,7 +3707,7 @@ void rcu_scheduler_starting(void)
 /*
  * Helper function for rcu_init() that initializes one rcu_state structure.
  */
-static void __init rcu_init_one(struct rcu_state *rsp)
+static void __init rcu_init_one(void)
 {
 	static const char * const buf[] = RCU_NODE_NAME_INIT;
 	static const char * const fqs[] = RCU_FQS_NAME_INIT;
@@ -3719,6 +3719,7 @@ static void __init rcu_init_one(struct rcu_state *rsp)
 	int i;
 	int j;
 	struct rcu_node *rnp;
+	struct rcu_state *rsp = &rcu_state;
 
 	BUILD_BUG_ON(RCU_NUM_LVLS > ARRAY_SIZE(buf));  /* Fix buf[] init! */
 
@@ -3869,14 +3870,14 @@ static void __init rcu_init_geometry(void)
  * Dump out the structure of the rcu_node combining tree associated
  * with the rcu_state structure referenced by rsp.
  */
-static void __init rcu_dump_rcu_node_tree(struct rcu_state *rsp)
+static void __init rcu_dump_rcu_node_tree(void)
 {
 	int level = 0;
 	struct rcu_node *rnp;
 
 	pr_info("rcu_node tree layout dump\n");
 	pr_info(" ");
-	rcu_for_each_node_breadth_first(rsp, rnp) {
+	rcu_for_each_node_breadth_first(&rcu_state, rnp) {
 		if (rnp->level != level) {
 			pr_cont("\n");
 			pr_info(" ");
@@ -3898,9 +3899,9 @@ void __init rcu_init(void)
 
 	rcu_bootup_announce();
 	rcu_init_geometry();
-	rcu_init_one(&rcu_state);
+	rcu_init_one();
 	if (dump_tree)
-		rcu_dump_rcu_node_tree(&rcu_state);
+		rcu_dump_rcu_node_tree();
 	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
 
 	/*
-- 
2.17.1