netdev - Re: [PATCH net-next] net: relax rtnl

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Date:	Tue, 05 Oct 2010 00:29:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	hadi@...erus.ca, netdev@...r.kernel.org, jarkao2@...il.com
Subject: Re: [PATCH net-next] net: relax rtnl_dereference()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 04 Oct 2010 11:00:12 +0200

> Le lundi 04 octobre 2010 à 10:42 +0200, Eric Dumazet a écrit :
> 
>> BTW, rtnl_dereference() should be changed to use
>> rcu_dereference_protected() instead of rcu_dereference_check() :
>> If RTBL is held, there is no need to force a barrier.
>> 
> 
> [PATCH net-next] net: relax rtnl_dereference()
> 
> rtnl_dereference() is used in contexts where RTNL is held, to fetch an
> RCU protected pointer.
>  
> Updates to this pointer are prevented by RTNL, so we dont need
> smp_read_barrier_depends() and the ACCESS_ONCE() provided in
> rcu_dereference_check().
> 
> rtnl_dereference() is mainly a macro to document the locking invariant.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks.
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