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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>
This commit is contained in:
Li Zefan 2009-01-07 18:08:41 -08:00 committed by Linus Torvalds
parent 5a7625df72
commit 5771f0a223
1 changed files with 5 additions and 6 deletions
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11
kernel/cpuset.c
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@ -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,