linux-kernel - [PATCH tip/core/rcu 13/18] rcu/nocb: Remove obsolete nocb_cb_tail and nocb_cb

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Message-Id: <20190801230810.21570-13-paulmck@linux.ibm.com>
Date:   Thu,  1 Aug 2019 16:08:05 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, 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.ibm.com>
Subject: [PATCH tip/core/rcu 13/18] rcu/nocb: Remove obsolete nocb_cb_tail and nocb_cb_head fields

Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
---
 kernel/rcu/tree.h        | 2 --
 kernel/rcu/tree_plugin.h | 1 -
 2 files changed, 3 deletions(-)

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index d1df192272fb..6e4cf7de303f 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -194,8 +194,6 @@ struct rcu_data {
 
 	/* 5) Callback offloading. */
 #ifdef CONFIG_RCU_NOCB_CPU
-	struct rcu_head *nocb_cb_head;	/* CBs ready to invoke. */
-	struct rcu_head **nocb_cb_tail;
 	struct swait_queue_head nocb_cb_wq; /* For nocb kthreads to sleep on. */
 	struct task_struct *nocb_gp_kthread;
 	raw_spinlock_t nocb_lock;	/* Guard following pair of fields. */
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 458838c63a6c..1847fffdfa0a 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1913,7 +1913,6 @@ static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
 {
 	init_swait_queue_head(&rdp->nocb_cb_wq);
 	init_swait_queue_head(&rdp->nocb_gp_wq);
-	rdp->nocb_cb_tail = &rdp->nocb_cb_head;
 	raw_spin_lock_init(&rdp->nocb_lock);
 	timer_setup(&rdp->nocb_timer, do_nocb_deferred_wakeup_timer, 0);
 }
-- 
2.17.1