init_reap_node() initialization fix

It looks like there is a bug in init_reap_node() in slab.c that can cause
multiple oops's on certain ES7000 configurations.  The variable reap_node
is defined per cpu, but only initialized on a single CPU.  This causes an
oops in next_reap_node() when __get_cpu_var(reap_node) returns the wrong
value.  Fix is below.
Signed-off-by: Dan Yeisley <dan.yeisley@unisys.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

mm/slab.c

@@ -806,7 +806,7 @@ static void init_reap_node(int cpu)
 	if (node == MAX_NUMNODES)
 		node = 0;
 
-	__get_cpu_var(reap_node) = node;
+	per_cpu(reap_node, cpu) = node;
 }
 
 static void next_reap_node(void)