diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-01-07 18:08:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:11 -0800 |
| commit | 5771f0a2236df69683e9abea87f35f522c97ff94 (patch) | |
| tree | afc960ceac00ab20f2139496e4fa9feeea516467 /kernel/cpuset.c | |
| parent | 5a7625df725a486ad600b0036b6111dbd6321c41 (diff) | |
| download | lwn-5771f0a2236df69683e9abea87f35f522c97ff94.tar.gz lwn-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.c | 11 |
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, |