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Subject: Re: [PATCH RFC net-next 01/20] net: Move fib_convert_metrics to
 dst core
From: David Miller <davem@davemloft.net>
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From: David Ahern <dsahern@gmail.com>
Date: Sun, 25 Feb 2018 11:47:11 -0800

> diff --git a/net/core/dst.c b/net/core/dst.c
> index 007aa0b08291..5f70bc832bec 100644
> --- a/net/core/dst.c
> +++ b/net/core/dst.c
...
> +			val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
> +			if (val == TCP_CA_UNSPEC)
> +				return -EINVAL;

This makes the networking core depend upon CONFIG_INET.

You will have to untangle this somehow before your final submission.
Probably with an inline helper in the non-INET case that always
returns TCP_CA_UNSPEC.