linux-kernel - Re: [PATCH] kernfs: fix kernfs_node_from

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Message-ID: <20140214220440.GA3998@kroah.com>
Date:	Fri, 14 Feb 2014 14:04:40 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Li Zefan <lizefan@...wei.com>, Cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernfs: fix kernfs_node_from_dentry()

On Fri, Feb 14, 2014 at 11:03:01AM -0500, Tejun Heo wrote:
> On Fri, Feb 14, 2014 at 04:57:27PM +0800, Li Zefan wrote:
> > Currently kernfs_node_from_dentry() returns NULL for root dentry,
> > because root_dentry->d_op == NULL.
> > 
> > Due to this bug cgroupstats_build() returns -EINVAL for root cgroup.
> > 
> >   # mount -t cgroup -o cpuacct /cgroup
> >   # Documentation/accounting/getdelays -C /cgroup
> >   fatal reply error,  errno -22
> > 
> > With this fix:
> > 
> >   # Documentation/accounting/getdelays -C /cgroup
> >   sleeping 305, blocked 0, running 1, stopped 0, uninterruptible 1
> > 
> > Signed-off-by: Li Zefan <lizefan@...wei.com>
> 
> Acked-by: Tejun Heo <tj@...nel.org>

Is this needed for 3.14-final or 3.15-rc1?

thanks,

greg k-h
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