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From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH net-next 2/8] rtnetlink: add rtnl_register_module
Date: Wed, 8 Nov 2017 10:27:12 +0900
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Cc: Florian Westphal <fw@strlen.de>, netdev@vger.kernel.org
To: Peter Zijlstra <peterz@infradead.org>
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On Tue, 7 Nov 2017 15:57:36 +0100
Peter Zijlstra <peterz@infradead.org> wrote:

> +	link = tab[msgindex];
> +	rcu_assign_pointer(tab[msgindex], NULL);

It is not necessary (or useful) to use rcu_assign_pointer with NULL.
The rcu_assign_pointer used to special case NULL but doesn't in recent
years.