[IA64] cpumask_of_node() should handle -1 as a node

pcibus_to_node can return -1 if we cannot determine which node a pci bus
is on. If passed -1, cpumask_of_node will negatively index the lookup array
and pull in random data:

# cat /sys/devices/pci0000:00/0000:00:01.0/local_cpus
00000000,00000003,00000000,00000000
# cat /sys/devices/pci0000:00/0000:00:01.0/local_cpulist
64-65

Change cpumask_of_node to check for -1 and return cpu_all_mask in this
case:

# cat /sys/devices/pci0000:00/0000:00:01.0/local_cpus
ffffffff,ffffffff,ffffffff,ffffffff
# cat /sys/devices/pci0000:00/0000:00:01.0/local_cpulist
0-127
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/include/asm/topology.h

@@ -33,7 +33,9 @@
 /*
  * Returns a bitmask of CPUs on Node 'node'.
  */
-#define cpumask_of_node(node) (&node_to_cpu_mask[node])
+#define cpumask_of_node(node) ((node) == -1 ?				\
+			       cpu_all_mask :				\
+			       &node_to_cpu_mask[node])
 
 /*
  * Returns the number of the node containing Node 'nid'.