linux-kernel - [PATCH tip/core/rcu 27/41] percpu-refcount: Replace call_rcu_sched() with call

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Date:   Sun, 11 Nov 2018 11:43:56 -0800
From:   "Paul E. McKenney" <paulmck@...ux.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.ibm.com>,
        Tejun Heo <tj@...nel.org>, Ming Lei <ming.lei@...hat.com>,
        Bart Van Assche <bvanassche@....org>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH tip/core/rcu 27/41] percpu-refcount: Replace call_rcu_sched() with call_rcu()

Now that call_rcu()'s callback is not invoked until after all
preempt-disable regions of code have completed (in addition to explicitly
marked RCU read-side critical sections), call_rcu() can be used in place
of call_rcu_sched().  This commit therefore makes that change.

Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Ming Lei <ming.lei@...hat.com>
Cc: Bart Van Assche <bvanassche@....org>
Cc: Jens Axboe <axboe@...nel.dk>
---
 lib/percpu-refcount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index de10b8c0bff6..9877682e49c7 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -181,7 +181,7 @@ static void __percpu_ref_switch_to_atomic(struct percpu_ref *ref,
 	ref->confirm_switch = confirm_switch ?: percpu_ref_noop_confirm_switch;
 
 	percpu_ref_get(ref);	/* put after confirmation */
-	call_rcu_sched(&ref->rcu, percpu_ref_switch_to_atomic_rcu);
+	call_rcu(&ref->rcu, percpu_ref_switch_to_atomic_rcu);
 }
 
 static void __percpu_ref_switch_to_percpu(struct percpu_ref *ref)
-- 
2.17.1