rcutorture: Abstract torture-test cleanup

This commit creates a torture_cleanup() that handles the generic
cleanup actions local to kernel/torture.c.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 28 insertions, 2 deletions

diff --git a/kernel/torture.c b/kernel/torture.c
index 828d0b1a49b8..41ae5cc3c4c3 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -199,7 +199,7 @@ EXPORT_SYMBOL_GPL(torture_onoff_init);
 /*
  * Clean up after online/offline testing.
  */
-void torture_onoff_cleanup(void)
+static void torture_onoff_cleanup(void)
 {
 #ifdef CONFIG_HOTPLUG_CPU
         if (onoff_task == NULL)
@@ -403,7 +403,7 @@ EXPORT_SYMBOL_GPL(torture_shuffle_init);
 /*
  * Stop the shuffling.
  */
-void torture_shuffle_cleanup(void)
+static void torture_shuffle_cleanup(void)
 {
         torture_shuffle_task_unregister_all();
         if (shuffler_task) {
@@ -453,3 +453,29 @@ void __init torture_init_end(void)
         mutex_unlock(&fullstop_mutex);
 }
 EXPORT_SYMBOL_GPL(torture_init_end);
+
+/*
+ * Clean up torture module.  Please note that this is -not- invoked via
+ * the usual module_exit() mechanism, but rather by an explicit call from
+ * the client torture module.  Returns true if a race with system shutdown
+ * is detected.
+ *
+ * This must be called before the caller starts shutting down its own
+ * kthreads.
+ */
+bool torture_cleanup(void)
+{
+        mutex_lock(&fullstop_mutex);
+        if (fullstop == FULLSTOP_SHUTDOWN) {
+                pr_warn("Concurrent rmmod and shutdown illegal!\n");
+                mutex_unlock(&fullstop_mutex);
+                schedule_timeout_uninterruptible(10);
+                return true;
+        }
+        fullstop = FULLSTOP_RMMOD;
+        mutex_unlock(&fullstop_mutex);
+        torture_shuffle_cleanup();
+        torture_onoff_cleanup();
+        return false;
+}
+EXPORT_SYMBOL_GPL(torture_cleanup);