net,rcu: Convert call_rcu(xt_rateest_free_rcu) to kfree_rcu()

The RCU callback xt_rateest_free_rcu() just calls kfree(), so we can
use kfree_rcu() instead of call_rcu().  This also allows us to dispense
with an rcu_barrier() call, speeding up unloading of this module.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Patrick McHardy <kaber@trash.net>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/net/netfilter/xt_RATEEST.c b/net/netfilter/xt_RATEEST.c
index de079abd5bc873ae270abdfaa8d9c28af7df11ba..f264032b8c56e1748e84de12fa1ef801dfc35152 100644 (file)
--- a/net/netfilter/xt_RATEEST.c
+++ b/net/netfilter/xt_RATEEST.c
@@ -60,11 +60,6 @@ struct xt_rateest *xt_rateest_lookup(const char *name)
 }
 EXPORT_SYMBOL_GPL(xt_rateest_lookup);
 
-static void xt_rateest_free_rcu(struct rcu_head *head)
-{
-       kfree(container_of(head, struct xt_rateest, rcu));
-}
-
 void xt_rateest_put(struct xt_rateest *est)
 {
        mutex_lock(&xt_rateest_mutex);
@@ -75,7 +70,7 @@ void xt_rateest_put(struct xt_rateest *est)
                 * gen_estimator est_timer() might access est->lock or bstats,
                 * wait a RCU grace period before freeing 'est'
                 */
-               call_rcu(&est->rcu, xt_rateest_free_rcu);
+               kfree_rcu(est, rcu);
        }
        mutex_unlock(&xt_rateest_mutex);
 }
@@ -188,7 +183,6 @@ static int __init xt_rateest_tg_init(void)
 static void __exit xt_rateest_tg_fini(void)
 {
        xt_unregister_target(&xt_rateest_tg_reg);
-       rcu_barrier(); /* Wait for completion of call_rcu()'s (xt_rateest_free_rcu) */
 }