linux-kernel - Re: [Suggestion] kernel/cgroup.c: about kfree after 'get_new

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Date:	Wed, 08 May 2013 10:00:14 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Li Zefan <lizefan@...wei.com>
CC:	tj@...nel.org, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Suggestion] kernel/cgroup.c: about kfree after 'get_new_cssid'

On 2013年05月08日 08:50, Li Zefan wrote:
>>> There's a bug in cgroup_unload_subsys() that idr_destroy() should be called after
>>> >> ss->css_free(). That said, given there's no modular cgroup subsystem using css_id,
>>> >> and the whole css_id thing will be eliminated in 3.11, why bother fixing it.
>>> >>
>> > 
>> > I just find it by reading code (I also want to learn about kernel).
>> > 
>> > I guess, for some stable versions, may focus on it, they are the
>> > different branches from the latest version.
>> > 
>> > So, is it suitable to send related patch for the bug ?
>> > 
> As I said, there's no modular cgroup subsystem using css_id, so the bug
> doesn't exist in real world.
> 
> 
> 

Excuse me, my English is not quite well, I guess what you said is:

  a. idr_destroy() should be called after ss->css_free()
  b. need check the return value of cgroup_init_idr() in cgroup_init().

  but all features which related with the 2 issues above, never be used
in any main linux main branches.
  so, the 2 bugs doesn't exist in real world.

Is what I guess correct ?

Thanks.

-- 
Chen Gang

Asianux Corporation
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