[PATCH] provide pcibus_to_cpumask from topology

Patch from Matthew Dobson

Provide a pcibus_to_cpumask function in the topology infrastructure to
access the pre-existing array.

include/asm-generic/topology.h

@@ -47,6 +47,9 @@
 #ifndef node_to_memblk
 #define node_to_memblk(node)	(0)
 #endif
+#ifndef pcibus_to_cpumask
+#define pcibus_to_cpumask(bus)	(cpu_online_map)
+#endif
 
 /* Cross-node load balancing interval. */
 #ifndef NODE_BALANCE_RATE

include/asm-i386/topology.h

@@ -29,6 +29,8 @@
 
 #ifdef CONFIG_NUMA
 
+#include <asm/mpspec.h>
+
 /* Mappings between logical cpu number and node number */
 extern volatile unsigned long node_2_cpu_mask[];
 extern volatile int cpu_2_node[];
@@ -61,6 +63,12 @@ static inline int node_to_first_cpu(int node)
 /* Returns the number of the first MemBlk on Node 'node' */
 #define node_to_memblk(node) (node)
 
+/* Returns the number of the node containing PCI bus 'bus' */
+static inline unsigned long pcibus_to_cpumask(int bus)
+{
+	return node_to_cpumask(mp_bus_id_to_node[bus]);
+}
+
 /* Cross-node load balancing interval. */
 #define NODE_BALANCE_RATE 100