From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH] net: Convert net_mutex into rw_semaphore and down read
 it on net->init/->exit
Date: Tue, 14 Nov 2017 10:11:29 -0800
Message-ID: <20171114101129.351d8aed@xeon-e3>
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Cc: davem@davemloft.net, vyasevic@redhat.com,
        kstewart@linuxfoundation.org, pombredanne@nexb.com,
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To: Kirill Tkhai <ktkhai@virtuozzo.com>
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On Tue, 14 Nov 2017 16:53:33 +0300
Kirill Tkhai <ktkhai@virtuozzo.com> wrote:

> +	/*
> +	 * RCU-protected list, modifiable by pernet-init and -exit methods.
> +	 * When net namespace is alive (net::count > 0), all the changes
> +	 * are made under rw_sem held on write.
> +	 */
> +	struct list_head	fib_notifier_ops;
>  

If you use __rcu annotation then it could be checked (and the comment is not needed).