Re: [PATCH] rcutorture: remove useless INIT_LIST_HEAD()

From: Paul E. McKenney
Date: Tue May 10 2022 - 23:02:05 EST


On Wed, May 11, 2022 at 10:47:04AM +0800, Haowen Bai wrote:
> list rcu_torture_freelist has been inited staticly through LIST_HEAD,
> so there's no need to call another INIT_LIST_HEAD. Simply remove
> it.
>
> Signed-off-by: Haowen Bai <baihaowen@xxxxxxxxx>

For kernels with built-in rcutorture that starts automatically at
boot, you are quite correct.

But wouldn't there be trouble in the case where someone does a series of
"modprobe rcutorture" "rmmod rcutorture" commands?

Thanx, Paul

> ---
> kernel/rcu/rcutorture.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> index faf6b4c7a757..0005e259c4ce 100644
> --- a/kernel/rcu/rcutorture.c
> +++ b/kernel/rcu/rcutorture.c
> @@ -3247,7 +3247,6 @@ rcu_torture_init(void)
>
> /* Set up the freelist. */
>
> - INIT_LIST_HEAD(&rcu_torture_freelist);
> for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) {
> rcu_tortures[i].rtort_mbtest = 0;
> list_add_tail(&rcu_tortures[i].rtort_free,
> --
> 2.7.4
>