IB: Make needlessly global ib_mad_cache static

Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index 5ad41a6..92c7362 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -45,8 +45,7 @@
 MODULE_AUTHOR("Hal Rosenstock");
 MODULE_AUTHOR("Sean Hefty");
 
-
-kmem_cache_t *ib_mad_cache;
+static kmem_cache_t *ib_mad_cache;
 
 static struct list_head ib_mad_port_list;
 static u32 ib_mad_client_id = 0;
diff --git a/drivers/infiniband/core/mad_priv.h b/drivers/infiniband/core/mad_priv.h
index b4fa28d..d147f3b 100644
--- a/drivers/infiniband/core/mad_priv.h
+++ b/drivers/infiniband/core/mad_priv.h
@@ -212,8 +212,6 @@
 	struct ib_mad_qp_info qp_info[IB_MAD_QPS_CORE];
 };
 
-extern kmem_cache_t *ib_mad_cache;
-
 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr);
 
 struct ib_mad_send_wr_private *