linux-kernel - Re: [PATCH tip/core/rcu 8/9] net/netfilter: Replace rcu_swap_protected() with rcu

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Message-ID: <20191009153659.GA30521@paulmck-ThinkPad-P72>
Date:   Wed, 9 Oct 2019 08:36:59 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        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,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH tip/core/rcu 8/9] net/netfilter: Replace
 rcu_swap_protected() with rcu_replace()

On Tue, Oct 08, 2019 at 04:16:11PM +0200, Pablo Neira Ayuso wrote:
> On Wed, Oct 02, 2019 at 06:43:09PM -0700, paulmck@...nel.org wrote:
> > From: "Paul E. McKenney" <paulmck@...nel.org>
> > 
> > This commit replaces the use of rcu_swap_protected() with the more
> > intuitively appealing rcu_replace() 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>
> > Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> > Cc: Pablo Neira Ayuso <pablo@...filter.org>
> > Cc: Jozsef Kadlecsik <kadlec@...filter.org>
> > Cc: Florian Westphal <fw@...len.de>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: <netfilter-devel@...r.kernel.org>
> > Cc: <coreteam@...filter.org>
> > Cc: <netdev@...r.kernel.org>
> 
> Acked-by: Pablo Neira Ayuso <pablo@...filter.org>

Applied, thank you!

							Thanx, Paul

> > ---
> >  net/netfilter/nf_tables_api.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> > index d481f9b..8499baf 100644
> > --- a/net/netfilter/nf_tables_api.c
> > +++ b/net/netfilter/nf_tables_api.c
> > @@ -1461,8 +1461,9 @@ static void nft_chain_stats_replace(struct nft_trans *trans)
> >  	if (!nft_trans_chain_stats(trans))
> >  		return;
> >  
> > -	rcu_swap_protected(chain->stats, nft_trans_chain_stats(trans),
> > -			   lockdep_commit_lock_is_held(trans->ctx.net));
> > +	nft_trans_chain_stats(trans) =
> > +		rcu_replace(chain->stats, nft_trans_chain_stats(trans),
> > +			    lockdep_commit_lock_is_held(trans->ctx.net));
> >  
> >  	if (!nft_trans_chain_stats(trans))
> >  		static_branch_inc(&nft_counters_enabled);
> > -- 
> > 2.9.5
> >