linux-kernel - Re: Re: [PATCH net-next] net: socket: add the case sock_no

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Date:   Mon, 20 Sep 2021 09:33:09 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     "yajun.deng@...ux.dev" <yajun.deng@...ux.dev>
Cc:     kuba <kuba@...nel.org>, davem <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH net-next] net: socket: add the case sock_no_xxx support

On Mon, Sep 20, 2021 at 5:28 AM yajun.deng@...ux.dev
<yajun.deng@...ux.dev> wrote:
>
> From: Cong Wang
> Date: 2021-09-20 07:52
> To: Yajun Deng
> CC: Jakub Kicinski; David Miller; Linux Kernel Network Developers; LKML
> Subject: Re: [PATCH net-next] net: socket: add the case sock_no_xxx support
> On Sat, Sep 18, 2021 at 5:11 AM <yajun.deng@...ux.dev> wrote:
> >
> > September 18, 2021 9:33 AM, "Jakub Kicinski" <kuba@...nel.org> wrote:
> >
> > > On Thu, 16 Sep 2021 20:29:43 +0800 Yajun Deng wrote:
> > >
> > >> Those sock_no_{mmap, socketpair, listen, accept, connect, shutdown,
> > >> sendpage} functions are used many times in struct proto_ops, but they are
> > >> meaningless. So we can add them support in socket and delete them in struct
> > >> proto_ops.
> > >
> > > So the reason to do this is.. what exactly?
> > >
> > > Removing a couple empty helpers (which is not even part of this patch)?
> > >
> > > I'm not sold, sorry.
> >
> > When we define a struct proto_ops xxx, we only need to assign meaningful member variables that we need.
> > Those {mmap, socketpair, listen, accept, connect, shutdown, sendpage} members we don't need assign
> > it if we don't need. We just need do once in socket, not in every struct proto_ops.
> >
> > These members are assigned meaningless values far more often than meaningful ones, so this patch I used likely(!!sock->ops->xxx) for this case. This is the reason why I send this patch.
>
> But you end up adding more code:
>
> 1 file changed, 58 insertions(+), 13 deletions(-)
>
> Yes，This would add more code, but this is at the cost of reducing other codes. At the same time, the code will only run  likely(!sock->ops->xxx) in most cases.  Don’t you think that this kind of meaningless thing shouldn’t be done by socket?

I have no idea why you call it reducing code while adding 45 lines
of code. So this does not make sense to me.

Thanks.