linux-kernel - [PATCH 2/6] cpuset: remove on stack cpumask_t in cpuset_can

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Message-ID: <495B2EE7.4040406@cn.fujitsu.com>
Date:	Wed, 31 Dec 2008 16:35:51 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>,
	Mike Travis <travis@....com>, Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/6] cpuset: remove on stack cpumask_t in cpuset_can_attach()

Impact: redue stack usage

Just use cs->cpus_allowed, and no need to allocate a cpumask_var_t.

Signed-off-by: Li Zefan <lizf@...fujistu.com>
---
 kernel/cpuset.c |   11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 41c2343..afa29cf 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1311,20 +1311,19 @@ static int cpuset_can_attach(struct cgroup_subsys *ss,
 			     struct cgroup *cont, struct task_struct *tsk)
 {
 	struct cpuset *cs = cgroup_cs(cont);
+	int ret = 0;
 
 	if (cpus_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
 		return -ENOSPC;
-	if (tsk->flags & PF_THREAD_BOUND) {
-		cpumask_t mask;
 
+	if (tsk->flags & PF_THREAD_BOUND) {
 		mutex_lock(&callback_mutex);
-		mask = cs->cpus_allowed;
+		if (!cpus_equal(tsk->cpus_allowed, cs->cpus_allowed))
+			ret = -EINVAL;
 		mutex_unlock(&callback_mutex);
-		if (!cpus_equal(tsk->cpus_allowed, mask))
-			return -EINVAL;
 	}
 
-	return security_task_setscheduler(tsk, 0, NULL);
+	return ret < 0 ? ret : security_task_setscheduler(tsk, 0, NULL);
 }
 
 static void cpuset_attach(struct cgroup_subsys *ss,
-- 
1.5.4.rc3



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