Re: [PATCH] rcutorture: Make stall-tasks directly exit when rcutorture tests end

[Paul E. McKenney]

On Thu, Mar 21, 2024 at 04:28:50PM +0800, Zqiang wrote:
> When the rcutorture tests start to exit, the rcu_torture_cleanup() is
> invoked to stop kthreads and release resources, if the stall-task
> kthreads exist, cpu-stall has started and the rcutorture.stall_cpu
> is set to a larger value, the rcu_torture_cleanup() will be blocked
> for a long time and the hung-task may occur, this commit therefore
> add kthread_should_stop() to the loop of cpu-stall operation, when
> rcutorture tests ends, no need to wait for cpu-stall to end, exit
> directly.
> 
> Signed-off-by: Zqiang <qiang.zhang1211@xxxxxxxxx>

Good eyes!

Queued for testing and further review, thank you!

							Thanx, Paul

> ---
>  kernel/rcu/rcutorture.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> index 3f9c3766f52b..6a3cd6ed8b25 100644
> --- a/kernel/rcu/rcutorture.c
> +++ b/kernel/rcu/rcutorture.c
> @@ -2490,7 +2490,7 @@ static int rcu_torture_stall(void *args)
>  		pr_alert("%s start on CPU %d.\n",
>  			  __func__, raw_smp_processor_id());
>  		while (ULONG_CMP_LT((unsigned long)ktime_get_seconds(),
> -				    stop_at))
> +				    stop_at) && !kthread_should_stop())
>  			if (stall_cpu_block) {
>  #ifdef CONFIG_PREEMPTION
>  				preempt_schedule();
> -- 
> 2.17.1
>