netdev - Re: [Patch net-next] net_sched: only create filter chains for new filters/actions

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Message-ID: <CAM_iQpUJcK0ZSqK8=a_D9dBw1OED++A=bC9-UUov4ng0mMpJUg@mail.gmail.com>
Date:   Fri, 26 May 2017 09:55:25 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Jiri Pirko <jiri@...nulli.us>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...lanox.com>
Subject: Re: [Patch net-next] net_sched: only create filter chains for new filters/actions

On Fri, May 26, 2017 at 7:54 AM, David Miller <davem@...emloft.net> wrote:
> And I also didn't find the boolean logic hard to understand at all.
>
> It is in fact a very common pattern to pass a "create" boolean into
> lookup functions, to tell them whether to create a new object on
> lookup failure or not.  And then also to control that boolean via
> what kind of netlink request we are processing.

+10

It is a widely used pattern among the kernel source code.
I'd be surprised if an experienced kernel developer is not
aware of this pattern. ;)