Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755999Ab1BQBsi (ORCPT ); Wed, 16 Feb 2011 20:48:38 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:63202 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755932Ab1BQBse (ORCPT ); Wed, 16 Feb 2011 20:48:34 -0500 Message-ID: <4D5C7EBF.2070603@cn.fujitsu.com> Date: Thu, 17 Feb 2011 09:49:51 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.9) Gecko/20100921 Fedora/3.1.4-1.fc14 Thunderbird/3.1.4 MIME-Version: 1.0 To: Andrew Morton CC: LKML , Paul Menage , David Rientjes , =?UTF-8?B?57yqIOWLsA==?= , linux-mm@kvack.org Subject: [PATCH 2/4] cpuset: Remove unneeded NODEMASK_ALLOC() in cpuset_attch() References: <4D5C7EA7.1030409@cn.fujitsu.com> In-Reply-To: <4D5C7EA7.1030409@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-02-17 09:47:35, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-02-17 09:47:36, Serialize complete at 2011-02-17 09:47:36 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1572 Lines: 52 oldcs->mems_allowed is not modified during cpuset_attch(), so we don't have to copy it to a buffer allocated by NODEMASK_ALLOC(). Just pass it to cpuset_migrate_mm(). Signed-off-by: Li Zefan --- kernel/cpuset.c | 7 ++----- 1 files changed, 2 insertions(+), 5 deletions(-) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index f13ff2e..70c9ca2 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1438,10 +1438,9 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont, struct mm_struct *mm; struct cpuset *cs = cgroup_cs(cont); struct cpuset *oldcs = cgroup_cs(oldcont); - NODEMASK_ALLOC(nodemask_t, from, GFP_KERNEL); NODEMASK_ALLOC(nodemask_t, to, GFP_KERNEL); - if (from == NULL || to == NULL) + if (to == NULL) goto alloc_fail; if (cs == &top_cpuset) { @@ -1463,18 +1462,16 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont, } /* change mm; only needs to be done once even if threadgroup */ - *from = oldcs->mems_allowed; *to = cs->mems_allowed; mm = get_task_mm(tsk); if (mm) { mpol_rebind_mm(mm, to); if (is_memory_migrate(cs)) - cpuset_migrate_mm(mm, from, to); + cpuset_migrate_mm(mm, &oldcs->mems_allowed, to); mmput(mm); } alloc_fail: - NODEMASK_FREE(from); NODEMASK_FREE(to); } -- 1.7.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/