cgroup,rcu: convert call_rcu(free_cgroup_rcu) to kfree_rcu()

The rcu callback free_cgroup_rcu() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(free_cgroup_rcu).

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index d5160a8..20451ce 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -806,13 +806,6 @@ static int cgroup_call_pre_destroy(struct cgroup *cgrp)
        return ret;
 }
 
-static void free_cgroup_rcu(struct rcu_head *obj)
-{
-       struct cgroup *cgrp = container_of(obj, struct cgroup, rcu_head);
-
-       kfree(cgrp);
-}
-
 static void cgroup_diput(struct dentry *dentry, struct inode *inode)
 {
        /* is dentry a directory ? if so, kfree() associated cgroup */
@@ -850,7 +843,7 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
                 */
                BUG_ON(!list_empty(&cgrp->pidlists));
 
-               call_rcu(&cgrp->rcu_head, free_cgroup_rcu);
+               kfree_rcu(cgrp, rcu_head);
        }
        iput(inode);
 }