From: Eric Dumazet <eric.dumazet@gmail.com>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netfilter-devel@vger.kernel.org, davem@davemloft.net,
netdev@vger.kernel.org
Subject: Re: [PATCH 3/6] netfilter: ctnetlink: use GFP_ATOMIC in all allocations
Date: Tue, 06 Mar 2012 07:09:17 -0800 [thread overview]
Message-ID: <1331046557.2474.45.camel@edumazet-laptop> (raw)
In-Reply-To: <20120306144838.GA1527@1984>
Le mardi 06 mars 2012 à 15:48 +0100, Pablo Neira Ayuso a écrit :
> On Tue, Mar 06, 2012 at 04:50:21AM -0800, Eric Dumazet wrote:
> > This cant be right.
> >
> > Really this must be kept as GFP_KERNEL allocations.
> >
> > Only if .call_rcu member is used in place of .call rcu_read_lock() is
> > held instead of nfnl_lock().
>
> I thought we couldn't sleep while holding rcu_read_lock.
True, but as far as I can see we dont hold rcu_read_lock() at this
point, only a mutex.
I added the .call_rcu() mechanism in struct nfnl_callback only for very
specific needs, namely performance improvements in commit 84a797dd0
(netfilter: nfnetlink_queue: provide rcu enabled callbacks)
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next prev parent reply other threads:[~2012-03-06 15:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-06 11:22 [PATCH 0/6] netfilter fixes for 3.3-rc6 pablo
2012-03-06 11:22 ` [PATCH 1/6] netfilter: ebtables: fix wrong name length while copying to user-space pablo
2012-03-06 20:15 ` David Miller
2012-03-06 11:22 ` [PATCH 2/6] netfilter: ctnetlink: remove incorrect spin_[un]lock_bh on NAT module autoload pablo
2012-03-06 20:15 ` David Miller
2012-03-06 11:22 ` [PATCH 3/6] netfilter: ctnetlink: use GFP_ATOMIC in all allocations pablo
2012-03-06 12:50 ` Eric Dumazet
2012-03-06 14:48 ` Pablo Neira Ayuso
2012-03-06 15:09 ` Eric Dumazet [this message]
2012-03-06 15:35 ` Pablo Neira Ayuso
2012-03-06 20:20 ` David Miller
2012-03-06 11:22 ` [PATCH 4/6] netfilter: bridge: fix wrong pointer dereference pablo
2012-03-06 20:15 ` David Miller
2012-03-06 11:22 ` [PATCH 5/6] bridge: netfilter: don't call iptables on vlan packets if sysctl is off pablo
2012-03-06 20:15 ` David Miller
2012-03-06 11:22 ` [PATCH 6/6] netfilter: nf_conntrack: fix early_drop with reliable event delivery pablo
2012-03-06 20:16 ` David Miller
2012-03-07 13:19 ` Pablo Neira Ayuso
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