From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3 net-next 3/3] rds: Extend RDS API for IPv6 support
Date: Fri, 13 Jul 2018 14:25:07 -0700 (PDT)
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From: Ka-Cheong Poon <ka-cheong.poon@oracle.com>
Date: Fri, 13 Jul 2018 04:02:59 -0700

> @@ -52,7 +52,7 @@
>  #define RDS_RECVERR			5
>  #define RDS_CONG_MONITOR		6
>  #define RDS_GET_MR_FOR_DEST		7
> -#define SO_RDS_TRANSPORT		8
> +#define SO_RDS_TRANSPORT		9

There is no way you can change this value without breaking
applications.