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    Subject[PATCH tip/core/rcu 22/28] ipc,rcu: Convert call_rcu(free_un) to kfree_rcu()
    Date
    From: Lai Jiangshan <laijs@cn.fujitsu.com>

    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>
    ---
    ipc/sem.c | 10 ++--------
    1 files changed, 2 insertions(+), 8 deletions(-)

    diff --git a/ipc/sem.c b/ipc/sem.c
    index 34193ed..8b929e6 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);
    }
    --
    1.7.3.2


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