linux-kernel - Re: [PATCH] rcutorture: remove useless INIT_LIST

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Message-ID: <20220511030157.GB1790663@paulmck-ThinkPad-P17-Gen-1>
Date:   Tue, 10 May 2022 20:01:57 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Haowen Bai <baihaowen@...zu.com>
Cc:     Davidlohr Bueso <dave@...olabs.net>,
        Josh Triplett <josh@...htriplett.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org, rcu@...r.kernel.org
Subject: Re: [PATCH] rcutorture: remove useless INIT_LIST_HEAD()

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@...zu.com>

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
>