ipc,rcu: Convert call_rcu(free_un) to kfree_rcu()

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

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Manfred Spraul <manfred@colorfullife.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 2 insertions, 8 deletions

diff --git a/ipc/sem.c b/ipc/sem.c
index 34193ed69fbe..8b929e6a6eda 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -689,12 +689,6 @@ static int count_semzcnt (struct sem_array * sma, ushort semnum)
         return semzcnt;
 }
 
-static void free_un(struct rcu_head *head)
-{
-        struct sem_undo *un = container_of(head, struct sem_undo, rcu);
-        kfree(un);
-}
-
 /* Free a semaphore set. freeary() is called with sem_ids.rw_mutex locked
  * as a writer and the spinlock for this semaphore set hold. sem_ids.rw_mutex
  * remains locked on exit.
@@ -714,7 +708,7 @@ static void freeary(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
                 un->semid = -1;
                 list_del_rcu(&un->list_proc);
                 spin_unlock(&un->ulp->lock);
-                call_rcu(&un->rcu, free_un);
+                kfree_rcu(un, rcu);
         }
 
         /* Wake up all pending processes and let them fail with EIDRM. */
@@ -1612,7 +1606,7 @@ void exit_sem(struct task_struct *tsk)
                 sem_unlock(sma);
                 wake_up_sem_queue_do(&tasks);
 
-                call_rcu(&un->rcu, free_un);
+                kfree_rcu(un, rcu);
         }
         kfree(ulp);
 }