linux-kernel - Re: [PATCH net-next] net: dlci: Deprecate the DLCI driver (aka the Frame Relay layer)

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Date:   Sat, 31 Oct 2020 10:24:06 -0700
From:   Xie He <xie.he.0141@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Krzysztof Halasa <khc@...waw.pl>
Subject: Re: [PATCH net-next] net: dlci: Deprecate the DLCI driver (aka the
 Frame Relay layer)

On Sat, Oct 31, 2020 at 9:51 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> > > The usual way of getting rid of old code is to move it to staging/
> > > for a few releases then delete it, like Arnd just did with wimax.
> >
> > Oh. OK. But I see "include/linux/if_frad.h" is included in
> > "net/socket.c", and there's still some code in "net/socket.c" related
> > to it. If we move all these files to "staging/", we need to change the
> > "include" line in "net/socket.c" to point to the new location, and we
> > still need to keep a little code in "net/socket.c". So I think if we
> > move it to "staging/", we can't do this in a clean way.
>
> I'd just place that code under appropriate #ifdef CONFIG_ so we don't
> forget to remove it later.  It's just the dlci_ioctl_hook, right?

Searching "dlci" (case insensitive) in "net/socket.c", I found there
were 3 areas with "dlci.c" related code. I also found there were 2
macro definitions in "include/uapi/linux/sockios.h".

> Maybe others have better ideas, Arnd?