powerpc/numa: remove start/stop_topology_update()

These APIs have become no-ops, so remove them and all call sites.
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/20200612051238.1007764-12-nathanl@linux.ibm.com

arch/powerpc/include/asm/topology.h

@@ -93,19 +93,9 @@ static inline int cpu_distance(__be32 *cpu1_assoc, __be32 *cpu2_assoc)
 #endif /* CONFIG_NUMA */
 
 #if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR)
-extern int start_topology_update(void);
-extern int stop_topology_update(void);
 extern int prrn_is_enabled(void);
 extern int find_and_online_cpu_nid(int cpu);
 #else
-static inline int start_topology_update(void)
-{
-	return 0;
-}
-static inline int stop_topology_update(void)
-{
-	return 0;
-}
 static inline int prrn_is_enabled(void)
 {
 	return 0;

arch/powerpc/mm/numa.c

@@ -1157,8 +1157,6 @@ static long vphn_get_associativity(unsigned long cpu,
 			, rc);
 		break;
 	}
-
-	stop_topology_update();
 out:
 	return rc;
 }
@@ -1212,22 +1210,6 @@ int arch_update_cpu_topology(void)
 	return numa_update_cpu_topology(true);
 }
 
-/*
- * Start polling for associativity changes.
- */
-int start_topology_update(void)
-{
-	return 0;
-}
-
-/*
- * Disable polling for VPHN associativity changes.
- */
-int stop_topology_update(void)
-{
-	return 0;
-}
-
 int prrn_is_enabled(void)
 {
 	return 0;
@@ -1235,8 +1217,6 @@ int prrn_is_enabled(void)
 
 static int topology_update_init(void)
 {
-	start_topology_update();
-
 	topology_inited = 1;
 	return 0;
 }

arch/powerpc/platforms/pseries/mobility.c

@@ -388,8 +388,6 @@ static ssize_t migration_store(struct class *class,
 	if (rc)
 		return rc;
 
-	stop_topology_update();
-
 	do {
 		rc = rtas_ibm_suspend_me(streamid);
 		if (rc == -EAGAIN)
@@ -401,8 +399,6 @@ static ssize_t migration_store(struct class *class,
 
 	post_mobility_fixup();
 
-	start_topology_update();
-
 	return count;
 }
 

arch/powerpc/platforms/pseries/suspend.c

@@ -145,11 +145,8 @@ static ssize_t store_hibernate(struct device *dev,
 			ssleep(1);
 	} while (rc == -EAGAIN);
 
-	if (!rc) {
-		stop_topology_update();
+	if (!rc)
 		rc = pm_suspend(PM_SUSPEND_MEM);
-		start_topology_update();
-	}
 
 	stream_id = 0;