linux-kernel - Re: [PATCH] rcutorture: Make the rcu_gp_slow_register/unregister() be used only for rcutype test

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Date: Mon, 1 Apr 2024 09:09:13 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Zqiang <qiang.zhang1211@...il.com>
Cc: frederic@...nel.org, neeraj.upadhyay@...nel.org, joel@...lfernandes.org,
	rcu@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcutorture: Make the rcu_gp_slow_register/unregister()
 be used only for rcutype test

On Fri, Mar 29, 2024 at 12:52:45PM +0800, Zqiang wrote:
> The rcu_gp_slow_register/unregister() is only valid for tests which
> the torture_type is rcu, this commit therefore generates gp_slow_register
> and gp_slow_unregister function pointers in rcu_torture_ops structures,
> and operates only when the function pointer exists.
> 
> Signed-off-by: Zqiang <qiang.zhang1211@...il.com>

Good point, queued, thank you!

							Thanx, Paul

> ---
>  kernel/rcu/rcutorture.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> index 8654e99bd4a3..32f1c4e932eb 100644
> --- a/kernel/rcu/rcutorture.c
> +++ b/kernel/rcu/rcutorture.c
> @@ -382,6 +382,8 @@ struct rcu_torture_ops {
>  	bool (*check_boost_failed)(unsigned long gp_state, int *cpup);
>  	int (*stall_dur)(void);
>  	void (*get_gp_data)(int *flags, unsigned long *gp_seq);
> +	void (*gp_slow_register)(atomic_t *rgssp);
> +	void (*gp_slow_unregister)(atomic_t *rgssp);
>  	long cbflood_max;
>  	int irq_capable;
>  	int can_boost;
> @@ -570,6 +572,8 @@ static struct rcu_torture_ops rcu_ops = {
>  	.check_boost_failed	= rcu_check_boost_fail,
>  	.stall_dur		= rcu_jiffies_till_stall_check,
>  	.get_gp_data		= rcutorture_get_gp_data,
> +	.gp_slow_register	= rcu_gp_slow_register,
> +	.gp_slow_unregister	= rcu_gp_slow_unregister,
>  	.irq_capable		= 1,
>  	.can_boost		= IS_ENABLED(CONFIG_RCU_BOOST),
>  	.extendables		= RCUTORTURE_MAX_EXTEND,
> @@ -3343,12 +3347,12 @@ rcu_torture_cleanup(void)
>  			pr_info("%s: Invoking %pS().\n", __func__, cur_ops->cb_barrier);
>  			cur_ops->cb_barrier();
>  		}
> -		rcu_gp_slow_unregister(NULL);
> +		if (cur_ops->gp_slow_unregister)
> +			cur_ops->gp_slow_unregister(NULL);
>  		return;
>  	}
>  	if (!cur_ops) {
>  		torture_cleanup_end();
> -		rcu_gp_slow_unregister(NULL);
>  		return;
>  	}
>  
> @@ -3447,7 +3451,8 @@ rcu_torture_cleanup(void)
>  	else
>  		rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS");
>  	torture_cleanup_end();
> -	rcu_gp_slow_unregister(&rcu_fwd_cb_nodelay);
> +	if (cur_ops->gp_slow_unregister)
> +		cur_ops->gp_slow_unregister(NULL);
>  }
>  
>  #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
> @@ -3929,7 +3934,8 @@ rcu_torture_init(void)
>  	if (object_debug)
>  		rcu_test_debug_objects();
>  	torture_init_end();
> -	rcu_gp_slow_register(&rcu_fwd_cb_nodelay);
> +	if (cur_ops->gp_slow_register)
> +		cur_ops->gp_slow_register(&rcu_fwd_cb_nodelay);
>  	return 0;
>  
>  unwind:
> -- 
> 2.17.1
>