On Fri, 2014-10-17 at 13:31 +0900, Erik Kline wrote:
[...]
> --- a/include/uapi/linux/ipv6.h
> +++ b/include/uapi/linux/ipv6.h
> @@ -154,6 +154,7 @@ enum {
>  	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
>  	DEVCONF_PROXY_NDP,
>  	DEVCONF_OPTIMISTIC_DAD,
> +	DEVCONF_USE_OPTIMISTIC,
>  	DEVCONF_ACCEPT_SOURCE_ROUTE,
>  	DEVCONF_MC_FORWARDING,
>  	DEVCONF_DISABLE_IPV6,
[...]

As this is UAPI, the new entry must be added at the end of the
enumeration (well, before DEVCONF_MAX).

Ben.

-- 
Ben Hutchings
Reality is just a crutch for people who can't handle science fiction.