linux-kernel - Re: [PATCH] cgroup: move a check to parse_cgroupfs

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Message-ID: <4EF92409.3090404@cn.fujitsu.com>
Date:	Tue, 27 Dec 2011 09:48:57 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH] cgroup: move a check to parse_cgroupfs_options()

Tejun Heo wrote:
> Hello,
> 
> On Thu, Dec 22, 2011 at 7:40 PM, Li Zefan <lizf@...fujitsu.com> wrote:
>>> And where did this one go?
>>
>> The other one I removed sets opts->new_root to NULL, and this one detects
>> the NULL ptr:
>>
>> if (!opts->subsys_bits && !opts->none)
>>        return NULL;
>> ...
>> opts->new_root = NULL;
>> ...
>> if (!opts->new_root)
>>        return -EINVAL;
>>
>> shortcut to:
>>
>> if (!opts->subsys_bits && !opts->none)
>>        return -EINVAL;
> 
> Thanks for the explanation. Maybe explaining it briefly in the commit
> message would be nice?
> 

I recalled why we have this check in this place, that is to allow mounting
by hierarchy name, but it has been broken for a long time. I'll send a
fix with detailed changelog.
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