linux-kernel - Re: [PATCH 10/13] rcu/nocb: Delete bypass_timer upon nocb

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Date:   Tue, 2 Mar 2021 17:24:56 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Josh Triplett <josh@...htriplett.org>,
        Stable <stable@...r.kernel.org>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 10/13] rcu/nocb: Delete bypass_timer upon nocb_gp wakeup

On Tue, Feb 23, 2021 at 01:10:08AM +0100, Frederic Weisbecker wrote:
> A NOCB-gp wake up can safely delete the nocb_bypass_timer. nocb_gp_wait()
> is going to check again the bypass state and rearm the bypass timer if
> necessary.
> 
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: Lai Jiangshan <jiangshanlai@...il.com>
> Cc: Joel Fernandes <joel@...lfernandes.org>
> Cc: Neeraj Upadhyay <neeraju@...eaurora.org>
> Cc: Boqun Feng <boqun.feng@...il.com>

Give that you delete this code a couple of patches later in this series,
why not just leave it out entirely?  ;-)

							Thanx, Paul

> ---
>  kernel/rcu/tree_plugin.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
> index b62ad79bbda5..9da67b0d3997 100644
> --- a/kernel/rcu/tree_plugin.h
> +++ b/kernel/rcu/tree_plugin.h
> @@ -1711,6 +1711,8 @@ static bool __wake_nocb_gp(struct rcu_data *rdp_gp,
>  		del_timer(&rdp_gp->nocb_timer);
>  	}
>  
> +	del_timer(&rdp_gp->nocb_bypass_timer);
> +
>  	if (force || READ_ONCE(rdp_gp->nocb_gp_sleep)) {
>  		WRITE_ONCE(rdp_gp->nocb_gp_sleep, false);
>  		needwake = true;
> -- 
> 2.25.1
>