linux-kernel - Re: [PATCH tip/core/rcu 01/12] rcu: Remove rcu_swap

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Date:   Thu, 12 Dec 2019 10:21:39 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, mingo@...nel.org, jiangshanlai@...il.com,
        dipankar@...ibm.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        Bart Van Assche <bart.vanassche@....com>,
        Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Shane M Seymour <shane.seymour@....com>,
        Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Roy Luo <royluo@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH tip/core/rcu 01/12] rcu: Remove rcu_swap_protected()

On Thu, Dec 12, 2019 at 11:31:37AM +0200, Kalle Valo wrote:
> + linux-wireless
> 
> "Paul E. McKenney" <paulmck@...nel.org> writes:
> 
> > On Wed, Dec 11, 2019 at 08:09:11PM +0100, Matthias Brugger wrote:
> >> On 11/12/2019 19:37, Paul E. McKenney wrote:
> >>
> >> > --- a/drivers/net/wireless/mediatek/mt76/agg-rx.c
> >> > +++ b/drivers/net/wireless/mediatek/mt76/agg-rx.c
> >> > @@ -281,8 +281,8 @@ void mt76_rx_aggr_stop(struct mt76_dev *dev, struct mt76_wcid *wcid, u8 tidno)
> >> >  {
> >> >  	struct mt76_rx_tid *tid = NULL;
> >> >  
> >> > -	rcu_swap_protected(wcid->aggr[tidno], tid,
> >> > -			   lockdep_is_held(&dev->mutex));
> >> > +	tid = rcu_swap_protected(wcid->aggr[tidno], tid,
> >> > +				 lockdep_is_held(&dev->mutex));
> >> 
> >> I suppose you meant: rcu_replace_pointer() here.
> >
> > Indeed I did, and thank you for catching this!  Bad patch day here.  :-/
> >
> > Update below...
> >
> > 							Thanx, Paul
> >
> > ------------------------------------------------------------------------
> >
> > commit ad5572b091429a45e863acaa6a36cf396d44f58d
> > Author: Paul E. McKenney <paulmck@...nel.org>
> > Date:   Wed Dec 11 10:30:21 2019 -0800
> >
> >     wireless/mediatek: Replace rcu_swap_protected() with rcu_replace_pointer()
> >     
> >     This commit replaces the use of rcu_swap_protected() with the more
> >     intuitively appealing rcu_replace_pointer() as a step towards removing
> >     rcu_swap_protected().
> >     
> >     Link: https://lore.kernel.org/lkml/CAHk-=wiAsJLw1egFEE=Z7-GGtM6wcvtyytXZA1+BHqta4gg6Hw@mail.gmail.com/
> >     Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> >     Reported-by: "Martin K. Petersen" <martin.petersen@...cle.com>
> >     [ paulmck: Apply Matthias Brugger feedback. ]
> >     Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> >     Reviewed-by: "Martin K. Petersen" <martin.petersen@...cle.com>
> >     Cc: Felix Fietkau <nbd@....name>
> >     Cc: Lorenzo Bianconi <lorenzo.bianconi83@...il.com>
> >     Cc: Ryder Lee <ryder.lee@...iatek.com>
> >     Cc: Roy Luo <royluo@...gle.com>
> >     Cc: Kalle Valo <kvalo@...eaurora.org>
> >     Cc: "David S. Miller" <davem@...emloft.net>
> >     Cc: Matthias Brugger <matthias.bgg@...il.com>
> >     Cc: <linux-wireless@...r.kernel.org>
> >     Cc: <netdev@...r.kernel.org>
> >     Cc: <linux-arm-kernel@...ts.infradead.org>
> >     Cc: <linux-mediatek@...ts.infradead.org>
> 
> Via which tree is this supposed to go? If I should take this please
> resend to linux-wireless so that patchwork sees it, but if someone else
> is planning to take this:
> 
> Acked-by: Kalle Valo <kvalo@...eaurora.org>

I have queued it just preceding the commit that remove rcu_swap_protected()
with your ack, thank you!

							Thanx, Paul