rcu: Export rcu_scheduler_active

Kernel modules using rcu_read_lock_sched_held() must now have
access to rcu_scheduler_active, so it must be exported.

This should fix the fix for the boot-time RCU-lockdep splat.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <20100226030230.GA7743@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 7bfa004572b1c25ba16871f3761387d11221931a..f1125c1a6321950030c42e8e5e2df2689d068a94 100644 (file)
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -64,6 +64,7 @@ EXPORT_SYMBOL_GPL(rcu_sched_lock_map);
 #endif
 
 int rcu_scheduler_active __read_mostly;
+EXPORT_SYMBOL_GPL(rcu_scheduler_active);
 
 /*
  * This function is invoked towards the end of the scheduler's initialization