linux-kernel - Re: [PATCH v2] rcu/nocb: Correct output rcuog/rcuop kthreads information

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Date:   Fri, 17 Jun 2022 21:42:23 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Zqiang <qiang1.zhang@...el.com>
Cc:     frederic@...nel.org, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] rcu/nocb: Correct output rcuog/rcuop kthreads
 information

On Fri, Jun 17, 2022 at 10:15:19PM +0800, Zqiang wrote:
> This commit make rcuog and rcuop thread information output
> in the correct location.
> 
> Signed-off-by: Zqiang <qiang1.zhang@...el.com>

Good catch, queued for review and testing, thank you!

Ditto for the "rcu: Avoid reporting strict QSes from NMI context"
patch.

As always, I wordsmithed both commit logs, so please check to see if
I messed something up.

						Thanx, Paul

> ---
>  v1->v2:
>  Only change commit information, the v1 is
>  [PATCH] rcu: Fix incorrect judgment condition in show_rcu_nocb_state(). 
> 
>  kernel/rcu/tree_nocb.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
> index a8f574d8850d..f20aec4f4394 100644
> --- a/kernel/rcu/tree_nocb.h
> +++ b/kernel/rcu/tree_nocb.h
> @@ -1452,8 +1452,8 @@ static void show_rcu_nocb_gp_state(struct rcu_data *rdp)
>  		(long)rdp->nocb_gp_seq,
>  		rnp->grplo, rnp->grphi, READ_ONCE(rdp->nocb_gp_loops),
>  		rdp->nocb_gp_kthread ? task_state_to_char(rdp->nocb_gp_kthread) : '.',
> -		rdp->nocb_cb_kthread ? (int)task_cpu(rdp->nocb_gp_kthread) : -1,
> -		show_rcu_should_be_on_cpu(rdp->nocb_cb_kthread));
> +		rdp->nocb_gp_kthread ? (int)task_cpu(rdp->nocb_gp_kthread) : -1,
> +		show_rcu_should_be_on_cpu(rdp->nocb_gp_kthread));
>  }
>  
>  /* Dump out nocb kthread state for the specified rcu_data structure. */
> @@ -1497,7 +1497,7 @@ static void show_rcu_nocb_state(struct rcu_data *rdp)
>  		".B"[!!rcu_cblist_n_cbs(&rdp->nocb_bypass)],
>  		rcu_segcblist_n_cbs(&rdp->cblist),
>  		rdp->nocb_cb_kthread ? task_state_to_char(rdp->nocb_cb_kthread) : '.',
> -		rdp->nocb_cb_kthread ? (int)task_cpu(rdp->nocb_gp_kthread) : -1,
> +		rdp->nocb_cb_kthread ? (int)task_cpu(rdp->nocb_cb_kthread) : -1,
>  		show_rcu_should_be_on_cpu(rdp->nocb_cb_kthread));
>  
>  	/* It is OK for GP kthreads to have GP state. */
> -- 
> 2.25.1
>