linux-kernel - Re: [PATCH 7/7] netprio_cgroup: allow nesting and inherit config on cgroup creation

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Message-ID: <20121120144036.GP15971@htj.dyndns.org>
Date:	Tue, 20 Nov 2012 06:40:36 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Daniel Wagner <wagi@...om.org>
Cc:	serge.hallyn@...onical.com, ebiederm@...ssion.com,
	nhorman@...driver.com, tgraf@...g.ch, davem@...emloft.net,
	lizefan@...wei.com, cgroups@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 7/7] netprio_cgroup: allow nesting and inherit config on
 cgroup creation

Hello, Daniel.

On Tue, Nov 20, 2012 at 09:57:14AM +0100, Daniel Wagner wrote:
> >-static void cgrp_css_free(struct cgroup *cgrp)
> >+static int cgrp_css_online(struct cgroup *cgrp)
> >  {
> >-	struct cgroup_netprio_state *cs = cgrp_netprio_state(cgrp);
> >+	struct cgroup *parent = cgrp->parent;
> >  	struct net_device *dev;
> >+	int ret = 0;
> >+
> >+	if (!parent)
> >+		return 0;
> 
> BTW, parent is always != NULL, because the root cgroup will be
> attached to the dummytop cgroup.

Hmmm?  I'm confused.  When ->css_online() is called for dummytop in
cgroup_init_subsys(), its parent is NULL.  What am I missing?

Thanks.

-- 
tejun
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