netdev - Re: [PATCH net-next v3 3/5] tc/act: remove unneeded RCU lock in action callback

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Date:   Wed, 25 Jul 2018 15:24:08 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eyal Birger <eyal.birger@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 3/5] tc/act: remove unneeded RCU lock in
 action callback

On Wed, Jul 25, 2018 at 07:59:48AM -0400, Jamal Hadi Salim wrote:
> On 24/07/18 04:06 PM, Paolo Abeni wrote:
> > Each lockless action currently does its own RCU locking in ->act().
> > This is allows using plain RCU accessor, even if the context
> > is really RCU BH.
> > 
> > This change drops the per action RCU lock, replace the accessors
> > with _bh variant, cleans up a bit the surronding code and documents
> > the RCU status in the relevant header.
> > No functional nor performance change is intended.
> > 
> > The goal of this patch is clarifying that the RCU critical section
> > used by the tc actions extends up to the classifier's caller.
> > 
> 
> This and 2/5 seems to stand on their own merit.

So does 1/5, I think.

> 
> cheers,
> jamal