linux-kernel - Re: [PATCH 07/11] rcu/nocb: Use appropriate rcu_nocb_lock

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Message-ID: <20211004133341.GB273854@lothringen>
Date:   Mon, 4 Oct 2021 15:33:41 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     "Paul E . McKenney" <paulmck@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Josh Triplett <josh@...htriplett.org>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org
Subject: Re: [PATCH 07/11] rcu/nocb: Use appropriate rcu_nocb_lock_irqsave()

On Fri, Oct 01, 2021 at 06:50:55PM +0100, Valentin Schneider wrote:
> On 30/09/21 00:10, Frederic Weisbecker wrote:
> > Instead of hardcoding IRQ save and nocb lock, use the consolidated
> > API.
> >
> > Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> > Cc: Valentin Schneider <valentin.schneider@....com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> > Cc: Josh Triplett <josh@...htriplett.org>
> > Cc: Joel Fernandes <joel@...lfernandes.org>
> > Cc: Boqun Feng <boqun.feng@...il.com>
> > Cc: Neeraj Upadhyay <neeraju@...eaurora.org>
> > Cc: Uladzislau Rezki <urezki@...il.com>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> 
> Just one comment nit below.
> 
> Reviewed-by: Valentin Schneider <valentin.schneider@....com>
> 
> > ---
> >  kernel/rcu/tree.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> >
> > diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> > index b1fc6e498d90..1971a4e15e96 100644
> > --- a/kernel/rcu/tree.c
> > +++ b/kernel/rcu/tree.c
> > @@ -2492,8 +2492,7 @@ static void rcu_do_batch(struct rcu_data *rdp)
> 
> While at it:
> 
> -	 * Extract the list of ready callbacks, disabling to prevent
> +-	 * Extract the list of ready callbacks, disabling IRQs to prevent

Good catch, applied that in the patch.

Thanks.