rcutorture: Abstract torture_shutdown_notify()

Because handling the race between rmmod and system shutdown is not
specific to RCU, this commit abstracts torture_shutdown_notify(),
placing this code into kernel/torture.c.  This change also allows
fullstop_mutex to be private 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, 0 insertions, 23 deletions

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 68a689fc6ffa..2560e9313887 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -190,23 +190,6 @@ static DECLARE_WAIT_QUEUE_HEAD(barrier_wq);
 static void rcu_torture_cleanup(void);
 
 /*
- * Detect and respond to a system shutdown.
- */
-static int
-rcutorture_shutdown_notify(struct notifier_block *unused1,
-                           unsigned long unused2, void *unused3)
-{
-        mutex_lock(&fullstop_mutex);
-        if (fullstop == FULLSTOP_DONTSTOP)
-                fullstop = FULLSTOP_SHUTDOWN;
-        else
-                pr_warn(/* but going down anyway, so... */
-                       "Concurrent 'rmmod rcutorture' and shutdown illegal!\n");
-        mutex_unlock(&fullstop_mutex);
-        return NOTIFY_DONE;
-}
-
-/*
  * Allocate an element from the rcu_tortures pool.
  */
 static struct rcu_torture *
@@ -1098,10 +1081,6 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
                  onoff_interval, onoff_holdoff);
 }
 
-static struct notifier_block rcutorture_shutdown_nb = {
-        .notifier_call = rcutorture_shutdown_notify,
-};
-
 static void rcutorture_booster_cleanup(int cpu)
 {
         struct task_struct *t;
@@ -1428,7 +1407,6 @@ rcu_torture_cleanup(void)
                         cur_ops->cb_barrier();
                 return;
         }
-        unregister_reboot_notifier(&rcutorture_shutdown_nb);
 
         rcu_torture_barrier_cleanup();
         rcu_torture_stall_cleanup();
@@ -1774,7 +1752,6 @@ rcu_torture_init(void)
                 firsterr = i;
                 goto unwind;
         }
-        register_reboot_notifier(&rcutorture_shutdown_nb);
         i = rcu_torture_stall_init();
         if (i != 0) {
                 firsterr = i;