linux-kernel - Re: [PATCH] mfd: dln2: Switch to kvfree

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Date:   Fri, 17 Dec 2021 16:06:05 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH] mfd: dln2: Switch to kvfree_rcu() API

On Thu, Dec 16, 2021 at 6:02 PM Lee Jones <lee.jones@...aro.org> wrote:
>
> On Wed, 15 Dec 2021, Uladzislau Rezki wrote:
>
> > On Wed, Dec 15, 2021 at 12:18:41PM +0100, Uladzislau Rezki (Sony) wrote:
> > > Instead of invoking a synchronize_rcu() to free a pointer
> > > after a grace period we can directly make use of new API
> > > that does the same but in more efficient way.
> > >
> > > TO: Lee Jones <lee.jones@...aro.org>
> > > TO: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
> > > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> > > ---
> > >  drivers/mfd/dln2.c | 6 ++----
> > >  1 file changed, 2 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
> > > index 852129ea0766..365e3e77cac4 100644
> > > --- a/drivers/mfd/dln2.c
> > > +++ b/drivers/mfd/dln2.c
> > > @@ -179,10 +179,8 @@ void dln2_unregister_event_cb(struct platform_device *pdev, u16 id)
> > >
> > >     spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
> > >
> > > -   if (found) {
> > > -           synchronize_rcu();
> > > -           kfree(i);
> > > -   }
> > > +   if (found)
> > > +           kvfree_rcu(i);
> > >  }
> > >  EXPORT_SYMBOL(dln2_unregister_event_cb);
> > >
> > + Lee Jones <lee.jones@...aro.org>
> > + Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
>
> I can't do anything with this.
>
> Send it properly please.
>
I got. Will do.

Thanks!

-- 
Uladzislau Rezki