linux-kernel - Re: [PATCH] net: Convert net_mutex into rw_semaphore and down read it on net->init/->exit

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Date:   Tue, 14 Nov 2017 10:11:29 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     davem@...emloft.net, vyasevic@...hat.com,
        kstewart@...uxfoundation.org, pombredanne@...b.com,
        vyasevich@...il.com, mark.rutland@....com,
        gregkh@...uxfoundation.org, adobriyan@...il.com, fw@...len.de,
        nicolas.dichtel@...nd.com, xiyou.wangcong@...il.com,
        roman.kapl@...go.com, paul@...l-moore.com, dsahern@...il.com,
        daniel@...earbox.net, lucien.xin@...il.com,
        mschiffer@...verse-factory.net, rshearma@...cade.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        ebiederm@...ssion.com, avagin@...tuozzo.com, gorcunov@...tuozzo.com
Subject: Re: [PATCH] net: Convert net_mutex into rw_semaphore and down read
 it on net->init/->exit

On Tue, 14 Nov 2017 16:53:33 +0300
Kirill Tkhai <ktkhai@...tuozzo.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).