linux-kernel - [PATCH tip/core/rcu 21/52] rcu: Remove rsp parameter from rcu_gp

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Date:   Wed, 29 Aug 2018 15:38:23 -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 21/52] rcu: Remove rsp parameter from rcu_gp_slow()

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_gp_slow().

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 752cd23860ed..751c28ddf5b1 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1820,10 +1820,10 @@ static void note_gp_changes(struct rcu_data *rdp)
 		rcu_gp_kthread_wake();
 }
 
-static void rcu_gp_slow(struct rcu_state *rsp, int delay)
+static void rcu_gp_slow(int delay)
 {
 	if (delay > 0 &&
-	    !(rcu_seq_ctr(rsp->gp_seq) %
+	    !(rcu_seq_ctr(rcu_state.gp_seq) %
 	      (rcu_num_nodes * PER_RCU_NODE_PERIOD * delay)))
 		schedule_timeout_uninterruptible(delay);
 }
@@ -1916,7 +1916,7 @@ static bool rcu_gp_init(struct rcu_state *rsp)
 		raw_spin_unlock_irq_rcu_node(rnp);
 		spin_unlock(&rsp->ofl_lock);
 	}
-	rcu_gp_slow(rsp, gp_preinit_delay); /* Races with CPU hotplug. */
+	rcu_gp_slow(gp_preinit_delay); /* Races with CPU hotplug. */
 
 	/*
 	 * Set the quiescent-state-needed bits in all the rcu_node
@@ -1932,7 +1932,7 @@ static bool rcu_gp_init(struct rcu_state *rsp)
 	 */
 	rsp->gp_state = RCU_GP_INIT;
 	rcu_for_each_node_breadth_first(rsp, rnp) {
-		rcu_gp_slow(rsp, gp_init_delay);
+		rcu_gp_slow(gp_init_delay);
 		raw_spin_lock_irqsave_rcu_node(rnp, flags);
 		rdp = this_cpu_ptr(&rcu_data);
 		rcu_preempt_check_blocked_tasks(rsp, rnp);
@@ -2058,7 +2058,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
 		rcu_nocb_gp_cleanup(sq);
 		cond_resched_tasks_rcu_qs();
 		WRITE_ONCE(rsp->gp_activity, jiffies);
-		rcu_gp_slow(rsp, gp_cleanup_delay);
+		rcu_gp_slow(gp_cleanup_delay);
 	}
 	rnp = rcu_get_root();
 	raw_spin_lock_irq_rcu_node(rnp); /* GP before rsp->gp_seq update. */
-- 
2.17.1