Use existing interface node_nr_slabs and node_nr_objs to get
nr_slabs and nr_objs.
Acked-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NWanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: NPekka Enberg <penberg@kernel.org>