diff mbox series

[39/48] rcutorture: Remove extraneous rcu_torture_pipe_update_one() READ_ONCE()

Message ID 20240507093530.3043-40-urezki@gmail.com (mailing list archive)
State Mainlined
Commit 8d0f9a6639f5083453602375ce9d3b71ef93ac73
Headers show
Series RCU changes for v6.10 | expand

Commit Message

Uladzislau Rezki May 7, 2024, 9:35 a.m. UTC 
From: "Paul E. McKenney" <paulmck@kernel.org>

The rcu_torture_pipe_update_one() cannot run concurrently with any updates
of ->rtort_pipe_count, so this commit removes the extraneous READ_ONCE()
from the read from this field.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/lkml/CAHk-=wiX_zF5Mpt8kUm_LFQpYY-mshrXJPOe+wKNwiVhEUcU9g@mail.gmail.com/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
 kernel/rcu/rcutorture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index d8c12eba35b7..6b821a7037b0 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -461,7 +461,7 @@  rcu_torture_pipe_update_one(struct rcu_torture *rp)
 		WRITE_ONCE(rp->rtort_chkp, NULL);
 		smp_store_release(&rtrcp->rtc_ready, 1); // Pair with smp_load_acquire().
 	}
-	i = READ_ONCE(rp->rtort_pipe_count);
+	i = rp->rtort_pipe_count;
 	if (i > RCU_TORTURE_PIPE_LEN)
 		i = RCU_TORTURE_PIPE_LEN;
 	atomic_inc(&rcu_torture_wcount[i]);