mm/slub: remove 'per_cpu' which is useless variable

Remove 'per_cpu', since it is useless now after the patch: "205ab99d
slub: Update statistics handling for variable order slabs". And the
partial list is handled in the same way as the per cpu slab.
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

mm/slub.c

@@ -4271,12 +4271,10 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
 	int node;
 	int x;
 	unsigned long *nodes;
-	unsigned long *per_cpu;
 
-	nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
+	nodes = kzalloc(sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
 	if (!nodes)
 		return -ENOMEM;
-	per_cpu = nodes + nr_node_ids;
 
 	if (flags & SO_CPU) {
 		int cpu;
@@ -4307,8 +4305,6 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
 				total += x;
 				nodes[node] += x;
 			}
-
-			per_cpu[node]++;
 		}
 	}