These functions are intended to be used only from inside kernel/watchdog.c
to park/unpark all watchdog threads that are specified in watchdog_cpumask.
Signed-off-by: Ulrich Obergfell <uober...@redhat.com>
---
kernel/watchdog.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index a6ffa43..5571f20 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -24,6 +24,7 @@
#include <asm/irq_regs.h>
#include <linux/kvm_para.h>
#include <linux/perf_event.h>
+#include <linux/kthread.h>
/*
* The run state of the lockup detectors is controlled by the content of the
@@ -666,6 +667,41 @@ static struct smp_hotplug_thread watchdog_threads = {
.unpark = watchdog_enable,
};
+/*
+ * park all watchdog threads that are specified in 'watchdog_cpumask'
+ */
+static int watchdog_park_threads(void)
+{
+ int cpu, ret = 0;
+
+ get_online_cpus();
+ for_each_watchdog_cpu(cpu) {
+ ret = kthread_park(per_cpu(softlockup_watchdog, cpu));
+ if (ret)
+ break;
+ }
+ if (ret) {
+ for_each_watchdog_cpu(cpu)
+ kthread_unpark(per_cpu(softlockup_watchdog, cpu));
+ }
+ put_online_cpus();
+
+ return ret;
+}
+
+/*
+ * unpark all watchdog threads that are specified in 'watchdog_cpumask'
+ */
+static void watchdog_unpark_threads(void)
+{
+ int cpu;
+
+ get_online_cpus();
+ for_each_watchdog_cpu(cpu)
+ kthread_unpark(per_cpu(softlockup_watchdog, cpu));
+ put_online_cpus();
+}
+
static void restart_watchdog_hrtimer(void *info)
{
struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer);
--
1.7.11.7
--
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