powerpc/numa: remove unreachable topology timer code

Since vphn_enabled is always 0, we can stub out
timed_topology_update() and remove the code which becomes unreachable.
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/20200612051238.1007764-7-nathanl@linux.ibm.com

arch/powerpc/mm/numa.c

@@ -1129,13 +1129,9 @@ struct topology_update_data {
 	int new_nid;
 };
 
-#define TOPOLOGY_DEF_TIMER_SECS	60
-
 static cpumask_t cpu_associativity_changes_mask;
 static const int vphn_enabled;
 static const int prrn_enabled;
-static void reset_topology_timer(void);
-static int topology_timer_secs = 1;
 static int topology_inited;
 
 /*
@@ -1143,15 +1139,6 @@ static int topology_inited;
  */
 int timed_topology_update(int nsecs)
 {
-	if (vphn_enabled) {
-		if (nsecs > 0)
-			topology_timer_secs = nsecs;
-		else
-			topology_timer_secs = TOPOLOGY_DEF_TIMER_SECS;
-
-		reset_topology_timer();
-	}
-
 	return 0;
 }
 
@@ -1438,14 +1425,6 @@ static void topology_schedule_update(void)
 	schedule_work(&topology_work);
 }
 
-static struct timer_list topology_timer;
-
-static void reset_topology_timer(void)
-{
-	if (vphn_enabled)
-		mod_timer(&topology_timer, jiffies + topology_timer_secs * HZ);
-}
-
 /*
  * Start polling for associativity changes.
  */