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sched/core: migrate_enable() must access takedown_cpu_task on !HOTPLUG_CPU 

The variable takedown_cpu_task is never declared/used on !HOTPLUG_CPU
except for migrate_enable(). This leads to a link error.

Don't use takedown_cpu_task in !HOTPLUG_CPU.

Reported-by: Dick Hollenbeck <dick@softplc.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2019-11-29 17:24:55 +01:00 committed by Alibek Omarov
parent 1158230ec6
commit fe6fe368b0
2 changed files with 4 additions and 0 deletions
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2
kernel/cpu.c
View File

@ -953,7 +953,9 @@ static int take_cpu_down(void *_param)
return 0;
}
#ifdef CONFIG_PREEMPT_RT
struct task_struct *takedown_cpu_task;
#endif
static int takedown_cpu(unsigned int cpu)
{

2
kernel/sched/core.c
View File

@ -8257,9 +8257,11 @@ void migrate_enable(void)
p->migrate_disable = 0;
rq->nr_pinned--;
#ifdef CONFIG_HOTPLUG_CPU
if (rq->nr_pinned == 0 && unlikely(!cpu_active(cpu)) &&
takedown_cpu_task)
wake_up_process(takedown_cpu_task);
#endif
if (!p->migrate_disable_scheduled)
goto out;