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Date:   Thu, 17 Jan 2019 12:26:07 -0800
From:   peng yu <yupeng0921@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net-next] remove TWKilled counter

On Thu, Jan 17, 2019 at 10:07 AM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> On Thu, Jan 17, 2019 at 3:43 AM yupeng <yupeng0921@...il.com> wrote:
> > diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
> > index 86dc24a96c90..fb0a17337bf2 100644
> > --- a/include/uapi/linux/snmp.h
> > +++ b/include/uapi/linux/snmp.h
> > @@ -178,7 +178,6 @@ enum
> >         LINUX_MIB_ARPFILTER,                    /* ArpFilter */
> >         LINUX_MIB_TIMEWAITED,                   /* TimeWaited */
> >         LINUX_MIB_TIMEWAITRECYCLED,             /* TimeWaitRecycled */
> > -       LINUX_MIB_TIMEWAITKILLED,               /* TimeWaitKilled */
> >         LINUX_MIB_PAWSACTIVEREJECTED,           /* PAWSActiveRejected */
> >         LINUX_MIB_PAWSESTABREJECTED,            /* PAWSEstabRejected */
> >         LINUX_MIB_DELAYEDACKS,                  /* DelayedACKs */
>
> This is no way to go, it is breaking user-space.
>
> You should at least keep this definition even if this counter is unused.

>From the snmp.h commit history, I didn't aware that we should keep the
user-space compatibility. For example, the commit 713bafea9292 removed
LINUX_MIB_TCPFACKREORDER, and the commit 4f693b55c3d2 inserted
LINUX_MIB_TCPBACKLOGCOALESCE to the middle of the linux mib
definitions enum. I think these commits would break the user-space
compatibility too. Did they use any method to avoid breaking the
user-space compatibility? Or if I misunderstand anything, please let
me know.

Thanks a lot.

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