percpu_refcount: export symbols

Export the interface to be used within modules.

Signed-off-by: Matias Bjorling <m@bjorling.me>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index 7deeb62..1a53d49 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -53,6 +53,7 @@
 	ref->release = release;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(percpu_ref_init);
 
 /**
  * percpu_ref_cancel_init - cancel percpu_ref_init()
@@ -84,6 +85,7 @@
 		free_percpu(ref->pcpu_count);
 	}
 }
+EXPORT_SYMBOL_GPL(percpu_ref_cancel_init);
 
 static void percpu_ref_kill_rcu(struct rcu_head *rcu)
 {
@@ -156,3 +158,4 @@
 
 	call_rcu_sched(&ref->rcu, percpu_ref_kill_rcu);
 }
+EXPORT_SYMBOL_GPL(percpu_ref_kill_and_confirm);