linux-kernel - Re: [PATCH] netfilter: use per-cpu recursive lock (v11)

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Date:	Tue, 21 Apr 2009 01:49:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	laijs@...fujitsu.com
Cc:	zbr@...emap.net, shemminger@...tta.com, dada1@...mosbay.com,
	paulus@...ba.org, paulmck@...ux.vnet.ibm.com, kaber@...sh.net,
	torvalds@...ux-foundation.org, jeff.chua.linux@...il.com,
	mingo@...e.hu, jengelh@...ozas.de, r000n@...0n.net,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, benh@...nel.crashing.org,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [PATCH] netfilter: use per-cpu recursive lock (v11)

From: Lai Jiangshan <laijs@...fujitsu.com>
Date: Tue, 21 Apr 2009 16:42:40 +0800

> softirq is always not nesting. Why we need recursive lock?

Netfilter itself, is nesting.

When using bridging netfilter, iptables can be entered twice
in the same call chain.
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