From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH iproute2 v2] vxlan: Allow setting destination to unicast
 address.
Date: Thu, 11 Apr 2013 08:24:38 -0700
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References: <87li8pmkvh.wl%atzm@stratosphere.co.jp>
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Cc: netdev@vger.kernel.org
To: Atzm Watanabe <atzm@stratosphere.co.jp>
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On Thu, 11 Apr 2013 19:17:54 +0900
Atzm Watanabe <atzm@stratosphere.co.jp> wrote:

> diff --git a/include/linux/if_link.h b/include/linux/if_link.h
> index 40167af..0bf03dc 100644
> --- a/include/linux/if_link.h
> +++ b/include/linux/if_link.h
> @@ -296,6 +296,7 @@ enum {
>  	IFLA_VXLAN_GROUP,
>  	IFLA_VXLAN_LINK,
>  	IFLA_VXLAN_LOCAL,
> +	IFLA_VXLAN_REMOTE,
>  	IFLA_VXLAN_TTL,
>  	IFLA_VXLAN_TOS,

You can't insert another value into the middle of an enum list.
It changes the kernel-userspace ABI values.