linux-kernel - Re: [PATCH v2 12/14] mac802154: Rename kfree_rcu() to kvfree_rcu

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Date:   Thu, 16 Mar 2023 14:06:30 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Stefan Schmidt <stefan@...enfreihafen.org>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Girault <david.girault@...vo.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Alexander Aring <aahringo@...hat.com>,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 12/14] mac802154: Rename kfree_rcu() to kvfree_rcu_mightsleep()

On Thu, Mar 16, 2023 at 12:41 PM Stefan Schmidt
<stefan@...enfreihafen.org> wrote:
>
> Hello.
>
> On 15.03.23 19:18, Joel Fernandes (Google) wrote:
> > The k[v]free_rcu() macro's single-argument form is deprecated.
> > Therefore switch to the new k[v]free_rcu_mightsleep() variant. The goal
> > is to avoid accidental use of the single-argument forms, which can
> > introduce functionality bugs in atomic contexts and latency bugs in
> > non-atomic contexts.
> >
> > The callers are holding a mutex so the context allows blocking. Hence
> > using the API with a single argument will be fine, but use its new name.
> >
> > There is no functionality change with this patch.
> >
> > Fixes: 57588c71177f ("mac802154: Handle passive scanning")
> > Reviewed-by: Paul E. McKenney <paulmck@...nel.org>
> > Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > ---
> >   net/mac802154/scan.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c
> > index 9b0933a185eb..5c191bedd72c 100644
> > --- a/net/mac802154/scan.c
> > +++ b/net/mac802154/scan.c
> > @@ -52,7 +52,7 @@ static int mac802154_scan_cleanup_locked(struct ieee802154_local *local,
> >       request = rcu_replace_pointer(local->scan_req, NULL, 1);
> >       if (!request)
> >               return 0;
> > -     kfree_rcu(request);
> > +     kvfree_rcu_mightsleep(request);
> >
> >       /* Advertize first, while we know the devices cannot be removed */
> >       if (aborted)
> > @@ -403,7 +403,7 @@ int mac802154_stop_beacons_locked(struct ieee802154_local *local,
> >       request = rcu_replace_pointer(local->beacon_req, NULL, 1);
> >       if (!request)
> >               return 0;
> > -     kfree_rcu(request);
> > +     kvfree_rcu_mightsleep(request);
> >
> >       nl802154_beaconing_done(wpan_dev);
> >
>
> I just saw that there is a v2 of this patch. My ACK still stands as for v1.
>
>
> Acked-by: Stefan Schmidt <stefan@...enfreihafen.org>

Thanks! Applied the ack and will be taking it via the RCU tree as we discussed.

 - Joel