netdev - Re: That's pretty much it for 3.5.0

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Message-ID: <20120718130430.GE25563@hmsreliant.think-freely.org>
Date:	Wed, 18 Jul 2012 09:04:30 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	John Fastabend <john.r.fastabend@...el.com>,
	h@...reliant.think-freely.org
Cc:	David Miller <davem@...emloft.net>, mark.d.rustad@...el.com,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: That's pretty much it for 3.5.0

On Tue, Jul 17, 2012 at 04:27:53PM -0700, John Fastabend wrote:
> On 7/17/2012 3:18 PM, David Miller wrote:
> >From: John Fastabend <john.r.fastabend@...el.com>
> >Date: Tue, 17 Jul 2012 15:13:36 -0700
> >
> >>Perhaps the easiest way is to check net->count this should be zero
> >>until setup_net is called.
> >>
> >>if (!atomic_read(&init_net.count))
> >>	return ret;
> >>
> >
> >Won't work, setup_net() runs via a pure_initcall().
> >
> 
> Why not must have missed something? cgroup_init() and
> cgroup_early_init() both run before _initcall() routines are
> called via kernel_init() so this will stop the update in
> netprio from occurring.
> 
> And I don't see any race elsewhere for this.
John, can you post the backtrace you got for this?  I replied to the patch that
you posted for this fix.  the cgroup subsystem has an early_init flag thats
supposed to prevent the initialization of cgroups that don't need initialization
until later (like via module_init() calls).
Neil

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