Re: [PATCH] kernfs: fix kernfs_node_from_dentry()

From: Greg Kroah-Hartman
Date: Fri Feb 14 2014 - 17:03:29 EST


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@xxxxxxxxxx>
>
> Acked-by: Tejun Heo <tj@xxxxxxxxxx>

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

thanks,

greg k-h
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