1 files changed, 16 insertions, 14 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 34f94240642f..168b2680ae27 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -240,7 +240,7 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
                 hard = hrtimer_get_expires(&rt_b->rt_period_timer);
                 delta = ktime_to_ns(ktime_sub(hard, soft));
                 __hrtimer_start_range_ns(&rt_b->rt_period_timer, soft, delta,
-                                HRTIMER_MODE_ABS, 0);
+                                HRTIMER_MODE_ABS_PINNED, 0);
         }
         spin_unlock(&rt_b->rt_runtime_lock);
 }
@@ -1155,7 +1155,7 @@ static __init void init_hrtick(void)
 static void hrtick_start(struct rq *rq, u64 delay)
 {
         __hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0,
-                        HRTIMER_MODE_REL, 0);
+                        HRTIMER_MODE_REL_PINNED, 0);
 }
 
 static inline void init_hrtick(void)
@@ -1978,7 +1978,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
                 if (task_hot(p, old_rq->clock, NULL))
                         schedstat_inc(p, se.nr_forced2_migrations);
 #endif
-                perf_counter_task_migration(p, new_cpu);
+                perf_swcounter_event(PERF_COUNT_SW_CPU_MIGRATIONS,
+                                     1, 1, NULL, 0);
         }
         p->se.vruntime -= old_cfsrq->min_vruntime -
                                          new_cfsrq->min_vruntime;
@@ -4420,6 +4421,11 @@ static struct {
         .load_balancer = ATOMIC_INIT(-1),
 };
 
+int get_nohz_load_balancer(void)
+{
+        return atomic_read(&nohz.load_balancer);
+}
+
 #if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
 /**
  * lowest_flag_domain - Return lowest sched_domain containing flag.
@@ -7078,7 +7084,7 @@ static int migration_thread(void *data)
 
                 if (cpu_is_offline(cpu)) {
                         spin_unlock_irq(&rq->lock);
-                        goto wait_to_die;
+                        break;
                 }
 
                 if (rq->active_balance) {
@@ -7104,16 +7110,7 @@ static int migration_thread(void *data)
                 complete(&req->done);
         }
         __set_current_state(TASK_RUNNING);
-        return 0;
 
-wait_to_die:
-        /* Wait for kthread_stop */
-        set_current_state(TASK_INTERRUPTIBLE);
-        while (!kthread_should_stop()) {
-                schedule();
-                set_current_state(TASK_INTERRUPTIBLE);
-        }
-        __set_current_state(TASK_RUNNING);
         return 0;
 }
 
@@ -7527,6 +7524,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 rq = task_rq_lock(p, &flags);
                 __setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1);
                 task_rq_unlock(rq, &flags);
+                get_task_struct(p);
                 cpu_rq(cpu)->migration_thread = p;
                 break;
 
@@ -7557,6 +7555,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 kthread_bind(cpu_rq(cpu)->migration_thread,
                              cpumask_any(cpu_online_mask));
                 kthread_stop(cpu_rq(cpu)->migration_thread);
+                put_task_struct(cpu_rq(cpu)->migration_thread);
                 cpu_rq(cpu)->migration_thread = NULL;
                 break;
 
@@ -7566,6 +7565,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 migrate_live_tasks(cpu);
                 rq = cpu_rq(cpu);
                 kthread_stop(rq->migration_thread);
+                put_task_struct(rq->migration_thread);
                 rq->migration_thread = NULL;
                 /* Idle task back to normal (off runqueue, low prio) */
                 spin_lock_irq(&rq->lock);
@@ -7861,7 +7861,7 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
                 free_rootdomain(old_rd);
 }
 
-static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
+static int init_rootdomain(struct root_domain *rd, bool bootmem)
 {
         gfp_t gfp = GFP_KERNEL;
 
@@ -9067,6 +9067,8 @@ void __init sched_init_smp(void)
 }
 #endif /* CONFIG_SMP */
 
+const_debug unsigned int sysctl_timer_migration = 1;
+
 int in_sched_functions(unsigned long addr)
 {
         return in_lock_functions(addr) ||