From 750db0f5f7d0ff6b86158015f02c275702639b20 Mon Sep 17 00:00:00 2001 From: Boqun Feng Date: Mon, 2 May 2016 10:30:00 +0800 Subject: [PATCH] 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 Signed-off-by: Paul E. McKenney --- kernel/torture.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/torture.c b/kernel/torture.c index fb39a06bbef5..75961b3decfe 100644 --- 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; }