rcu: Don't destroy rcu_torture_boost() callback until it is done

The rcu_torture_boost() cleanup code destroyed debug-objects state before
waiting for the last RCU callback to be invoked, resulting in rare but
very real debug-objects warnings.  Move the destruction to after the
waiting to fix this problem.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 75fca51..6a30ea3 100644 (file)
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -796,11 +796,11 @@ checkwait:        rcu_stutter_wait("rcu_torture_boost");
 
        /* Clean up and exit. */
        VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping");
-       destroy_rcu_head_on_stack(&rbi.rcu);
        rcutorture_shutdown_absorb("rcu_torture_boost");
        while (!kthread_should_stop() || rbi.inflight)
                schedule_timeout_uninterruptible(1);
        smp_mb(); /* order accesses to ->inflight before stack-frame death. */
+       destroy_rcu_head_on_stack(&rbi.rcu);
        return 0;
 }