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authorLi Zefan <lizf@cn.fujitsu.com>2009-01-07 18:08:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:11 -0800
commit5771f0a2236df69683e9abea87f35f522c97ff94 (patch)
treeafc960ceac00ab20f2139496e4fa9feeea516467 /kernel/cpuset.c
parent5a7625df725a486ad600b0036b6111dbd6321c41 (diff)
downloadblackbird-op-linux-5771f0a2236df69683e9abea87f35f522c97ff94.tar.gz
blackbird-op-linux-5771f0a2236df69683e9abea87f35f522c97ff94.zip
cpuset: remove on stack cpumask_t in cpuset_can_attach()
Impact: reduce stack usage Just use cs->cpus_allowed, and no need to allocate a cpumask_var_t. Signed-off-by: Li Zefan <lizf@cn.fujistu.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Mike Travis <travis@sgi.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 41c2343df975..afa29cfc5bbb 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,
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