cpu hotplug: Make cpu_active_map synchronization dependency clear

[mv-sheeva.git] / kernel / cpuset.c

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 798b3ab054ebda48f9dd758ba7d080b3ab51bd28..3c3ef02f65f109a52a6623f5353ea71e473a796a 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -564,7 +564,7 @@ update_domain_attr(struct sched_domain_attr *dattr, struct cpuset *c)
  *     partition_sched_domains().
  */
 
-static void rebuild_sched_domains(void)
+void rebuild_sched_domains(void)
 {
        struct kfifo *q;        /* queue of cpusets to be scanned */
        struct cpuset *cp;      /* scans q */
@@ -1194,6 +1194,15 @@ static int cpuset_can_attach(struct cgroup_subsys *ss,
 
        if (cpus_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
                return -ENOSPC;
+       if (tsk->flags & PF_THREAD_BOUND) {
+               cpumask_t mask;
+
+               mutex_lock(&callback_mutex);
+               mask = cs->cpus_allowed;
+               mutex_unlock(&callback_mutex);
+               if (!cpus_equal(tsk->cpus_allowed, mask))
+                       return -EINVAL;
+       }
 
        return security_task_setscheduler(tsk, 0, NULL);
 }
@@ -1207,11 +1216,14 @@ static void cpuset_attach(struct cgroup_subsys *ss,
        struct mm_struct *mm;
        struct cpuset *cs = cgroup_cs(cont);
        struct cpuset *oldcs = cgroup_cs(oldcont);
+       int err;
 
        mutex_lock(&callback_mutex);
        guarantee_online_cpus(cs, &cpus);
-       set_cpus_allowed_ptr(tsk, &cpus);
+       err = set_cpus_allowed_ptr(tsk, &cpus);
        mutex_unlock(&callback_mutex);
+       if (err)
+               return;
 
        from = oldcs->mems_allowed;
        to = cs->mems_allowed;