powerpc/numa: remove arch_update_cpu_topology

Since arch_update_cpu_topology() doesn't do anything on powerpc now,
remove it and associated dead code.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200612051238.1007764-15-nathanl@linux.ibm.com

arch/powerpc/include/asm/topology.h

@@ -43,7 +43,6 @@ extern void __init dump_numa_cpu_topology(void);
 
 extern int sysfs_add_device_to_node(struct device *dev, int nid);
 extern void sysfs_remove_device_from_node(struct device *dev, int nid);
-extern int numa_update_cpu_topology(bool cpus_locked);
 
 static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node)
 {
@@ -78,11 +77,6 @@ static inline void sysfs_remove_device_from_node(struct device *dev,
 {
 }
 
-static inline int numa_update_cpu_topology(bool cpus_locked)
-{
-	return 0;
-}
-
 static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node) {}
 
 static inline int cpu_distance(__be32 *cpu1_assoc, __be32 *cpu2_assoc)

arch/powerpc/mm/numa.c

@@ -1200,16 +1200,6 @@ int find_and_online_cpu_nid(int cpu)
 	return new_nid;
 }
 
-int numa_update_cpu_topology(bool cpus_locked)
-{
-	return 0;
-}
-
-int arch_update_cpu_topology(void)
-{
-	return numa_update_cpu_topology(true);
-}
-
 static int topology_update_init(void)
 {
 	topology_inited = 1;