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torture: Stop onoff task if there is only one cpu

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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 <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Boqun Feng 2016-05-02 10:30:00 +08:00 committed by Paul E. McKenney
parent 682ed706c5
commit 750db0f5f7
1 changed files with 8 additions and 0 deletions
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8
kernel/torture.c
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@ -194,6 +194,12 @@ torture_onoff(void *arg)
for_each_online_cpu(cpu) for_each_online_cpu(cpu)
maxcpu = cpu; maxcpu = cpu;
WARN_ON(maxcpu < 0); 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) { if (onoff_holdoff > 0) {
VERBOSE_TOROUT_STRING("torture_onoff begin holdoff"); VERBOSE_TOROUT_STRING("torture_onoff begin holdoff");
schedule_timeout_interruptible(onoff_holdoff); schedule_timeout_interruptible(onoff_holdoff);
@ -209,6 +215,8 @@ torture_onoff(void *arg)
&sum_online, &min_online, &max_online); &sum_online, &min_online, &max_online);
schedule_timeout_interruptible(onoff_interval); schedule_timeout_interruptible(onoff_interval);
} }
stop:
torture_kthread_stopping("torture_onoff"); torture_kthread_stopping("torture_onoff");
return 0; return 0;
} }