torture: Stop onoff task if there is only one cpu

If the whole system has only one cpu, that cpu won't be able to be offlined, so there is no need onoff task is stil running. Signed-off-by: Boqun Feng <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]>
ericholscher · Jun 14, 2016 · 750db0f · 750db0f
1 parent 682ed70
commit 750db0f
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/kernel/torture.c b/kernel/torture.c
@@ -194,6 +194,12 @@ torture_onoff(void *arg)
 	for_each_online_cpu(cpu)
 		maxcpu = cpu;
 	WARN_ON(maxcpu < 0);
+
+	if (maxcpu == 0) {
+		VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");
+		goto stop;
+	}
+
 	if (onoff_holdoff > 0) {
 		VERBOSE_TOROUT_STRING("torture_onoff begin holdoff");
 		schedule_timeout_interruptible(onoff_holdoff);
@@ -209,6 +215,8 @@ torture_onoff(void *arg)
 				       &sum_online, &min_online, &max_online);
 		schedule_timeout_interruptible(onoff_interval);
 	}
+
+stop:
 	torture_kthread_stopping("torture_onoff");
 	return 0;
 }