From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Tue, 21 Jun 2011 08:48:03 +0000 (-0700)
Subject: rcu: Don't destroy rcu_torture_boost() callback until it is done
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9d68197c05201d8edc70d58bd1d5dad05d8455e8;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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 75fca518888c..6a30ea3f1d82 100644
--- 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;
 }