On 2013/6/23 0:30, Tejun Heo wrote:
> Before 1a57423166 ("cgroup: make hierarchy_id use cyclic idr"),
> hierarchy IDs were allocated from 0. As the dummy hierarchy was
> always the one first initialized, it got assigned 0 and all other
> hierarchies from 1. The patch accidentally changed the minimum
> useable ID to 2.
>
> Let's restore ID 0 for dummy_root and while at it reserve 1 for
> unified hierarchy.
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> kernel/cgroup.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
Acked-by: Li Zefan <lizefan@xxxxxxxxxx>
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