rcu: Fix backwards RCU_LOCKDEP_WARN() in synchronize_rcu_tasks()

The RCU_LOCKDEP_WARN() in synchronize_rcu_tasks() triggers if the
scheduler is active, which is backwards.  This commit therefore
negates the test.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 47268fb1d27b631ec522098466c0fc26f579475f..7a0b3bc7c5ed147162bec6a600e0bfbded04257d 100644 (file)
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -589,7 +589,7 @@ EXPORT_SYMBOL_GPL(call_rcu_tasks);
 void synchronize_rcu_tasks(void)
 {
        /* Complain if the scheduler has not started.  */
-       RCU_LOCKDEP_WARN(rcu_scheduler_active,
+       RCU_LOCKDEP_WARN(!rcu_scheduler_active,
                         "synchronize_rcu_tasks called too soon");
 
        /* Wait for the grace period. */