Re: [PATCH net] sock_diag: request _diag module only when the family or proto has been registered

[Eric Dumazet]

On Tue, 2017-10-17 at 13:13 +0800, Xin Long wrote:

> +bool sock_is_registered(int family)
> +{
> +     return family < NPROTO && rcu_access_pointer(net_families[family]);
> +}

EXPORT_SYMBOL() ?