netdev - Re: [v3 Patch 2/3] bridge: make bridge support netpoll

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Date:	Mon, 12 Apr 2010 12:38:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org,
	Andy Gospodarek <gospo@...hat.com>,
	Neil Horman <nhorman@...driver.com>,
	Jeff Moyer <jmoyer@...hat.com>, Matt Mackall <mpm@...enic.com>,
	bonding-devel@...ts.sourceforge.net,
	Jay Vosburgh <fubar@...ibm.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [v3 Patch 2/3] bridge: make bridge support netpoll

Le lundi 12 avril 2010 à 18:37 +0800, Cong Wang a écrit :
> Stephen Hemminger wrote:
> > There is no protection on dev->priv_flags for SMP access.
> > It would better bit value in dev->state if you are using it as control flag.
> > 
> > Then you could use 
> > 			if (unlikely(test_and_clear_bit(__IN_NETPOLL, &skb->dev->state)))
> > 				netpoll_send_skb(...)
> > 
> > 
> 
> Hmm, I think we can't use ->state here, it is not for this kind of purpose,
> according to its comments.
> 
> Also, I find other usages of IFF_XXX flags of ->priv_flags are also using
> &, | to set or clear the flags. So there must be some other things preventing
> the race...

Yes, its RTNL that protects priv_flags changes, hopefully...


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