netdev - Re: [PATCH net-next] Remove DECnet support from kernel

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Date:   Mon, 9 Jan 2023 08:04:23 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Cc:     David Ahern <dsahern@...nel.org>, Jonathan Corbet <corbet@....net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>, Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Muchun Song <songmuchun@...edance.com>,
        Akhmat Karakotov <hmukos@...dex-team.ru>,
        Antoine Tenart <atenart@...nel.org>,
        Xin Long <lucien.xin@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Nathan Fontenot <nathan.fontenot@....com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Suma Hegde <suma.hegde@....com>, Chen Yu <yu.c.chen@...el.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Pali Rohár <pali@...nel.org>,
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        Kees Cook <keescook@...omium.org>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Wang Qing <wangqing@...o.com>, Yu Zhe <yuzhe@...china.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
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        <linuxppc-dev@...ts.ozlabs.org>,
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Subject: Re: [PATCH net-next] Remove DECnet support from kernel

On 18. 08. 22, 2:43, Stephen Hemminger wrote:
> DECnet is an obsolete network protocol that receives more attention
> from kernel janitors than users. It belongs in computer protocol
> history museum not in Linux kernel.
> 
> It has been "Orphaned" in kernel since 2010. The iproute2 support
> for DECnet was dropped in 5.0 release. The documentation link on
> Sourceforge says it is abandoned there as well.
> 
> Leave the UAPI alone to keep userspace programs compiling.
> This means that there is still an empty neighbour table
> for AF_DECNET.
> 
> The table of /proc/sys/net entries was updated to match
> current directories and reformatted to be alphabetical.
> 
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> Acked-by: David Ahern <dsahern@...nel.org>

...
>   include/uapi/linux/dn.h                       |  149 -
>   include/uapi/linux/netfilter_decnet.h         |   72 -

Hi,

this breaks userspace. Some projects include linux/dn.h:

   https://codesearch.debian.net/search?q=include.*linux%2Fdn.h&literal=0


I found Trinity fails to build:
  net/proto-decnet.c:5:10: fatal error: linux/dn.h: No such file or 
directory
      5 | #include <linux/dn.h>



Should we provide the above as empty files?

thanks,
-- 
js
suse labs