linux-kernel - Re: [PATCH 2/5] cgroup: export __cgroup_from_dentry() and __cgroup

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Message-ID: <20130805154016.GE19631@mtj.dyndns.org>
Date:	Mon, 5 Aug 2013 11:40:16 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	hannes@...xchg.org, mhocko@...e.cz, bsingharora@...il.com,
	kamezawa.hiroyu@...fujitsu.com, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] cgroup: export __cgroup_from_dentry() and
 __cgroup_dput()

On Mon, Aug 05, 2013 at 10:58:13AM +0800, Li Zefan wrote:
> > +struct cgroup *__cgroup_from_dentry(struct dentry *dentry, struct cftype **cftp)
> >  {
> > -	if (file_inode(file)->i_fop != &cgroup_file_operations)
> > -		return ERR_PTR(-EINVAL);
> > -	return __d_cft(file->f_dentry);
> > +	if (!dentry->d_inode ||
> > +	    dentry->d_inode->i_op != &cgroup_file_inode_operations)
> > +		return NULL;
> > +
> > +	if (cftp)
> > +		*cftp = __d_cft(dentry);
> > +	return __d_cgrp(dentry->d_parent);
> >  }
> > +EXPORT_SYMBOL_GPL(__cgroup_from_dentry);
> 
> As we don't expect new users, why export this symbol? memcg can't be
> built as a module.

Yeah, I for some reason was thinking memcg could be bulit as module.
Brainfart.  Dropped.

Thanks.

-- 
tejun
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