linux-kernel - [PATCH tip/core/rcu 08/12] rcutorture: Move to dynamic initialization of rcu

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Message-Id: <20191210034217.405-8-paulmck@kernel.org>
Date:   Mon,  9 Dec 2019 19:42:13 -0800
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, 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@...nel.org>
Subject: [PATCH tip/core/rcu 08/12] rcutorture: Move to dynamic initialization of rcu_fwds

From: "Paul E. McKenney" <paulmck@...nel.org>

In order to add multiple call_rcu() forward-progress kthreads, it will
be necessary to dynamically allocate and initialize.  This commit
therefore moves the initialization from compile time to instead
immediately precede thread-creation time.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/rcutorture.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index cc88ce9..6f540fe 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1686,11 +1686,7 @@ struct rcu_fwd {
 	unsigned long rcu_launder_gp_seq_start;
 };
 
-struct rcu_fwd rcu_fwds = {
-	.rcu_fwd_lock = __SPIN_LOCK_UNLOCKED(rcu_fwds.rcu_fwd_lock),
-	.rcu_fwd_cb_tail = &rcu_fwds.rcu_fwd_cb_head,
-};
-
+struct rcu_fwd rcu_fwds;
 bool rcu_fwd_emergency_stop;
 
 static void rcu_torture_fwd_cb_hist(struct rcu_fwd *rfp)
@@ -2026,6 +2022,8 @@ static int __init rcu_torture_fwd_prog_init(void)
 		WARN_ON(1); /* Make sure rcutorture notices conflict. */
 		return 0;
 	}
+	spin_lock_init(&rcu_fwds.rcu_fwd_lock);
+	rcu_fwds.rcu_fwd_cb_tail = &rcu_fwds.rcu_fwd_cb_head;
 	if (fwd_progress_holdoff <= 0)
 		fwd_progress_holdoff = 1;
 	if (fwd_progress_div <= 0)
-- 
2.9.5