linux-kernel - Re: [PATCH 08/23] cgroup: pass around cgroup_subsys_state instead of cgroup in subsystem methods

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Date:	Fri, 2 Aug 2013 11:54:24 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<containers@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	Aristeu Rozanski <aris@...hat.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 08/23] cgroup: pass around cgroup_subsys_state instead
 of cgroup in subsystem methods

> @@ -4298,7 +4308,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
>  	for_each_root_subsys(root, ss) {
>  		struct cgroup_subsys_state *css;
>  
> -		css = ss->css_alloc(cgrp);
> +		css = ss->css_alloc(parent->subsys[ss->subsys_id]);

As this patchset is based on for-3.12 branch, which lacks the fix in for-3.11,
so the css_alloc() in that bug fix is not converted.

>  		if (IS_ERR(css)) {
>  			err = PTR_ERR(css);
>  			goto err_free_all;
> @@ -4377,7 +4387,7 @@ err_free_all:
>  
>  		if (css) {
>  			percpu_ref_cancel_init(&css->refcnt);
> -			ss->css_free(cgrp);
> +			ss->css_free(css);
>  		}
>  	}
>  	mutex_unlock(&cgroup_mutex);

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