netdev - Re: [PATCH 6/13] bridge: Add core IGMP snooping support

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Message-Id: <20100310.083547.213194954.davem@davemloft.net>
Date:	Wed, 10 Mar 2010 08:35:47 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	paulmck@...ux.vnet.ibm.com
Cc:	herbert@...dor.apana.org.au, eric.dumazet@...il.com, arnd@...db.de,
	netdev@...r.kernel.org, shemminger@...tta.com
Subject: Re: [PATCH 6/13] bridge: Add core IGMP snooping support

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Date: Wed, 10 Mar 2010 08:26:58 -0800

> On Wed, Mar 10, 2010 at 10:07:29PM +0800, Herbert Xu wrote:
>> On Wed, Mar 10, 2010 at 05:13:18AM -0800, Paul E. McKenney wrote:
>> >
>> > If CONFIG_PROVE_RCU is set, rcu_dereference() checks for rcu_read_lock()
>> > and rcu_dereference_bh() checks for either rcu_read_lock_bh() or BH
>> > being disabled.  Yes, this is a bit restrictive, but there are a few too
>> > many to check by hand these days.
>> 
>> Fair enough.  We should get those fixed then.  In fact I reckon
>> most of them should be using the BH variant so we might be able
>> to kill a few rcu_read_lock's which would be a real gain.
> 
> I have -tip commit a898def29e4119bc01ebe7ca97423181f4c0ea2d that
> converts some of the rcu_dereference()s in net/core/filter.c,
> net/core/dev.c, net/decnet/dn_route.c, net/packet/af_packet.c, and
> net/ipv4/route.c to rcu_dereference_bh().
> 
> How should we coordinate the removal of the rcu_read_lock() calls?

Paul if you want to do this via your tree, feel free.
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