From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH net] vxlan: Use RCU apis to access sk_user_data.
Date: Tue, 24 Sep 2013 09:20:50 -0700
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Cc: netdev@vger.kernel.org, Jesse Gross <jesse@nicira.com>
To: Pravin B Shelar <pshelar@nicira.com>
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On Mon, 23 Sep 2013 22:28:21 -0700
Pravin B Shelar <pshelar@nicira.com> wrote:

>  
> +#define sk_user_data_rcu(sk) ((*((void __rcu **)&(sk)->sk_user_data)))

I don't like the macro, is it just to keep sparse happy?
The name also implies that rcu_dereference() is built in.