netdev - Re: [PATCH net-next 2/3] Implementation of RFC 4898 Extended TCP Statistics (Web10G)

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Message-ID: <CAADnVQ+rmBMoDRRu-Dtp7QBMJEbto9nb2zvFEXBCQsqpg6tS9A@mail.gmail.com>
Date:	Tue, 16 Dec 2014 10:24:31 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	rapier <rapier@....edu>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/3] Implementation of RFC 4898 Extended TCP
 Statistics (Web10G)

On Tue, Dec 16, 2014 at 9:50 AM, rapier <rapier@....edu> wrote:
> +struct idr tcp_estats_idr;
> +EXPORT_SYMBOL(tcp_estats_idr);
> +static int next_id = 1;
> +DEFINE_SPINLOCK(tcp_estats_idr_lock);
> +EXPORT_SYMBOL(tcp_estats_idr_lock);
> +
> +int tcp_estats_wq_enabled __read_mostly = 0;
> +EXPORT_SYMBOL(tcp_estats_wq_enabled);
> +struct workqueue_struct *tcp_estats_wq = NULL;
> +EXPORT_SYMBOL(tcp_estats_wq);
> +void (*create_notify_func)(struct work_struct *work);
> +EXPORT_SYMBOL(create_notify_func);
> +void (*establish_notify_func)(struct work_struct *work);
> +EXPORT_SYMBOL(establish_notify_func);
> +void (*destroy_notify_func)(struct work_struct *work);
> +EXPORT_SYMBOL(destroy_notify_func);
> +unsigned long persist_delay = 0;
> +EXPORT_SYMBOL(persist_delay);
> +
> +struct static_key tcp_estats_enabled __read_mostly = STATIC_KEY_INIT_FALSE;
> +EXPORT_SYMBOL(tcp_estats_enabled);
...
> +EXPORT_SYMBOL(tcp_estats_create);
...
> +/* Do not call directly.  Called from tcp_estats_unuse() through call_rcu.
> */
> +void tcp_estats_free(struct rcu_head *rcu)
...
> +EXPORT_SYMBOL(tcp_estats_free);

imo that is very questionable design choice.
export a lot of in-kernel bits to be used by out-of-tree kernel module?
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