1 files changed, 37 insertions, 11 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index eaf6751e7612..3aaa5c8cb421 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1127,6 +1127,7 @@ static enum hrtimer_restart hrtick(struct hrtimer *timer)
         return HRTIMER_NORESTART;
 }
 
+#ifdef CONFIG_SMP
 static void hotplug_hrtick_disable(int cpu)
 {
         struct rq *rq = cpu_rq(cpu);
@@ -1182,6 +1183,7 @@ static void init_hrtick(void)
 {
         hotcpu_notifier(hotplug_hrtick, 0);
 }
+#endif /* CONFIG_SMP */
 
 static void init_rq_hrtick(struct rq *rq)
 {
@@ -4396,22 +4398,20 @@ do_wait_for_common(struct completion *x, long timeout, int state)
                              signal_pending(current)) ||
                             (state == TASK_KILLABLE &&
                              fatal_signal_pending(current))) {
-                                __remove_wait_queue(&x->wait, &wait);
-                                return -ERESTARTSYS;
+                                timeout = -ERESTARTSYS;
+                                break;
                         }
                         __set_current_state(state);
                         spin_unlock_irq(&x->wait.lock);
                         timeout = schedule_timeout(timeout);
                         spin_lock_irq(&x->wait.lock);
-                        if (!timeout) {
-                                __remove_wait_queue(&x->wait, &wait);
-                                return timeout;
-                        }
-                } while (!x->done);
+                } while (!x->done && timeout);
                 __remove_wait_queue(&x->wait, &wait);
+                if (!x->done)
+                        return timeout;
         }
         x->done--;
-        return timeout;
+        return timeout ?: 1;
 }
 
 static long __sched
@@ -6877,7 +6877,12 @@ static int default_relax_domain_level = -1;
 
 static int __init setup_relax_domain_level(char *str)
 {
-        default_relax_domain_level = simple_strtoul(str, NULL, 0);
+        unsigned long val;
+
+        val = simple_strtoul(str, NULL, 0);
+        if (val < SD_LV_MAX)
+                default_relax_domain_level = val;
+
         return 1;
 }
 __setup("relax_domain_level=", setup_relax_domain_level);
@@ -7236,6 +7241,18 @@ void __attribute__((weak)) arch_update_cpu_topology(void)
 }
 
 /*
+ * Free current domain masks.
+ * Called after all cpus are attached to NULL domain.
+ */
+static void free_sched_domains(void)
+{
+        ndoms_cur = 0;
+        if (doms_cur != &fallback_doms)
+                kfree(doms_cur);
+        doms_cur = &fallback_doms;
+}
+
+/*
  * Set up scheduler domains and groups. Callers must hold the hotplug lock.
  * For now this just excludes isolated cpus, but could be used to
  * exclude other special cases in the future.
@@ -7382,6 +7399,7 @@ int arch_reinit_sched_domains(void)
         get_online_cpus();
         mutex_lock(&sched_domains_mutex);
         detach_destroy_domains(&cpu_online_map);
+        free_sched_domains();
         err = arch_init_sched_domains(&cpu_online_map);
         mutex_unlock(&sched_domains_mutex);
         put_online_cpus();
@@ -7467,6 +7485,7 @@ static int update_sched_domains(struct notifier_block *nfb,
         case CPU_DOWN_PREPARE:
         case CPU_DOWN_PREPARE_FROZEN:
                 detach_destroy_domains(&cpu_online_map);
+                free_sched_domains();
                 return NOTIFY_OK;
 
         case CPU_UP_CANCELED:
@@ -7485,8 +7504,16 @@ static int update_sched_domains(struct notifier_block *nfb,
                 return NOTIFY_DONE;
         }
 
+#ifndef CONFIG_CPUSETS
+        /*
+         * Create default domain partitioning if cpusets are disabled.
+         * Otherwise we let cpusets rebuild the domains based on the
+         * current setup.
+         */
+
         /* The hotplug lock is already held by cpu_up/cpu_down */
         arch_init_sched_domains(&cpu_online_map);
+#endif
 
         return NOTIFY_OK;
 }
@@ -7626,7 +7653,6 @@ static void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
         else
                 rt_se->rt_rq = parent->my_q;
 
-        rt_se->rt_rq = &rq->rt;
         rt_se->my_q = rt_rq;
         rt_se->parent = parent;
         INIT_LIST_HEAD(&rt_se->run_list);
@@ -8348,7 +8374,7 @@ static unsigned long to_ratio(u64 period, u64 runtime)
 #ifdef CONFIG_CGROUP_SCHED
 static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
 {
-        struct task_group *tgi, *parent = tg->parent;
+        struct task_group *tgi, *parent = tg ? tg->parent : NULL;
         unsigned long total = 0;
 
         if (!parent) {