netdev - Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}

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Message-ID: <20090428144920.GA28942@Krystal>
Date:	Tue, 28 Apr 2009 10:49:20 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	David Miller <davem@...emloft.net>
Cc:	mingo@...e.hu, dada1@...mosbay.com, torvalds@...ux-foundation.org,
	shemminger@...tta.com, zbr@...emap.net, peterz@...radead.org,
	jarkao2@...il.com, paulus@...ba.org, paulmck@...ux.vnet.ibm.com,
	kaber@...sh.net, jeff.chua.linux@...il.com, laijs@...fujitsu.com,
	jengelh@...ozas.de, r000n@...0n.net, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}

* David Miller (davem@...emloft.net) wrote:
> From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> Date: Tue, 28 Apr 2009 09:52:19 -0400
> 
> > The local_bh_disable() could be outside of the locking construct. This
> > would make it easier to adapt it to various users (irq disable, bh
> > disable, preempt disable) depending on the contexts from which they much
> > be protected.
> > 
> > And if it still does not work for some reason, using a #define is
> > discouraged, but could work.
> 
> That's what I was hoping to avoid, things like macros and having
> the callers of this thing expand the two parts of the operation.
> 
> What's the point in making this generic if it ends up being ugly
> as hell?

.. and what's the point in making it generic if it can be replaced
by a proper RCU implementation ? :-) I am not convinced of the added
value we get in making it a generic header this soon. I would wait for
other users to express similar needs, otherwise this could soon become
an orphaned piece of locking code.

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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