From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: [PATCH 08/24] [NETFILTER]: rename NF_ARP to AF_ARP and assign
 a non-clashing value
Date: Thu, 03 Apr 2008 13:59:02 +0200
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Cc: netfilter-devel@vger.kernel.org
To: Jan Engelhardt <jengelh@computergmbh.de>
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Jan Engelhardt wrote:
> For coming Xtables patches, we want to use AF_UNSPEC, but NF_ARP
> currently evaluates to the same value so it gets changed.
> 
> --- a/include/linux/socket.h
> +++ b/include/linux/socket.h
> @@ -179,6 +179,7 @@ struct ucred {
>  #define AF_ASH		18	/* Ash				*/
>  #define AF_ECONET	19	/* Acorn Econet			*/
>  #define AF_ATMSVC	20	/* ATM SVCs			*/
> +#define AF_ARP		21	/* Address Resolution for IPv4	*/

Did you make sure this value wasn't ever used by something else?
Is this used by userspace? If not, why change it?