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Date:	Sun, 16 Dec 2007 13:31:23 -0800 (PST)
From:	David Miller <>
Subject: Re: [PATCH net-2.6.25 4/7] Store the net pointer on devinet's ctl

From: Pavel Emelyanov <>
Date: Tue, 11 Dec 2007 20:53:55 +0300

> Some handers and strategies of devinet sysctl tables need
> to know the net to propagate the ctl change to all the
> net devices.
> I use the (currently unused) extra2 pointer on the tables
> to get it.
> Holding the reference on the struct net is not possible,
> because otherwise we'll get a net->ctl_table->net circular
> dependency. But since the ctl tables are unregistered during 
> the net destruction, this is safe to get it w/o additional 
> protection.
> Signed-off-by: Pavel Emelyanov <>

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