netdev - Re: [PATCH net-next-2.6] net: inet_add

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Message-ID: <20100909095920.GB8404@ff.dom.local>
Date:	Thu, 9 Sep 2010 09:59:20 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, jesse@...ira.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] net: inet_add_protocol() can use cmpxchg()

On Thu, Sep 09, 2010 at 11:23:57AM +0200, Eric Dumazet wrote:
> Le jeudi 09 septembre 2010 ?? 09:08 +0000, Jarek Poplawski a écrit :
> > xactly, without "after some time" I couldn't tell this
> > either. Is seems some barriers might have been changed, but I might
> > be wrong. Anyway, it would be nice to have some comment on that in
> > the changelog.
> 
> Jarek, cmpxchg() is a very strong primitive, as documented
> in Documentation/memory-barriers.txt :
...
> Its not needed to document each cmpxchg() use, because of these
> strong requirements.
> 

Btw, I wonder if for readability and debuging it shouldn't be made
generic as rcu_cmpxchg_pointer() etc.?

Jarek P.
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