From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755221AbZCLBr6 (ORCPT ); Wed, 11 Mar 2009 21:47:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754261AbZCLBre (ORCPT ); Wed, 11 Mar 2009 21:47:34 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:58559 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752992AbZCLBrc (ORCPT ); Wed, 11 Mar 2009 21:47:32 -0400 Message-ID: <49B869B2.1020303@cn.fujitsu.com> Date: Thu, 12 Mar 2009 09:47:30 +0800 From: Li Zefan User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: David Miller CC: Paul Menage , Thomas Graf , LKML , Linux Containers , netdev@vger.kernel.org, Andrew Morton Subject: [PATCH] cls_cgroup: remove unneeded cgroup_lock Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We can remove this lock here, since we are in cgroup write handler and thus the cgrp is guaranteed to be valid, and no lock is needed when writing a u32 variable. Signed-off-by: Li Zefan --- net/sched/cls_cgroup.c | 6 ------ 1 files changed, 0 insertions(+), 6 deletions(-) diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c index 91a3db4..1ab4542 100644 --- a/net/sched/cls_cgroup.c +++ b/net/sched/cls_cgroup.c @@ -62,13 +62,7 @@ static u64 read_classid(struct cgroup *cgrp, struct cftype *cft) static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value) { - if (!cgroup_lock_live_group(cgrp)) - return -ENODEV; - cgrp_cls_state(cgrp)->classid = (u32) value; - - cgroup_unlock(); - return 0; } -- 1.5.4.rc3