hung_task: add method to reset detector

[cascardo/linux.git] / kernel / hung_task.c

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 3e97fb1..dfdf515 100644 (file)
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -203,6 +203,14 @@ int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
        return ret;
 }
 
+static atomic_t reset_hung_task = ATOMIC_INIT(0);
+
+void reset_hung_task_detector(void)
+{
+       atomic_set(&reset_hung_task, 1);
+}
+EXPORT_SYMBOL_GPL(reset_hung_task_detector);
+
 /*
  * kthread which checks for tasks stuck in D state
  */
@@ -216,6 +224,9 @@ static int watchdog(void *dummy)
                while (schedule_timeout_interruptible(timeout_jiffies(timeout)))
                        timeout = sysctl_hung_task_timeout_secs;
 
+               if (atomic_xchg(&reset_hung_task, 0))
+                       continue;
+
                check_hung_uninterruptible_tasks(timeout);
        }