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

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Message-ID: <20140214220424.GA4634@mtj.dyndns.org>
Date:	Fri, 14 Feb 2014 17:04:24 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.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 02:04:40PM -0800, Greg Kroah-Hartman wrote:
> 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?

3.15-rc1, so, driver-core-next.

Thanks.

-- 
tejun
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