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 11:07:47 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>, 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, 2017-11-14 at 10:11 -0800, Stephen Hemminger wrote:
> 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).

I do not think we can use __rcu annotation yet on a struct list_head ?

(The annotation would be needed on the members)