sched/migration: Move prepare transition to SCHED_STARTING state

We can piggy pack that on the SCHED_STARTING state. It's not required before
the cpu actually comes online. Name the function proper as it has nothing to
do with migration.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160310120025.248226511@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 0a31078..bafc308 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5424,11 +5424,6 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
 
        switch (action & ~CPU_TASKS_FROZEN) {
 
-       case CPU_UP_PREPARE:
-               rq->calc_load_update = calc_load_update;
-               account_reset_rq(rq);
-               break;
-
        case CPU_ONLINE:
                /* Update our root-domain */
                raw_spin_lock_irqsave(&rq->lock, flags);
@@ -7139,9 +7134,19 @@ int sched_cpu_deactivate(unsigned int cpu)
        return 0;
 }
 
+static void sched_rq_cpu_starting(unsigned int cpu)
+{
+       struct rq *rq = cpu_rq(cpu);
+
+       rq->calc_load_update = calc_load_update;
+       account_reset_rq(rq);
+       update_max_interval();
+}
+
 int sched_cpu_starting(unsigned int cpu)
 {
        set_cpu_rq_start_time(cpu);
+       sched_rq_cpu_starting(cpu);
        return 0;
 }
 
@@ -7182,11 +7187,8 @@ void __init sched_init_smp(void)
 static int __init migration_init(void)
 {
        void *cpu = (void *)(long)smp_processor_id();
-       int err;
 
-       /* Initialize migration for the boot CPU */
-       err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
-       BUG_ON(err == NOTIFY_BAD);
+       sched_rq_cpu_starting(smp_processor_id());
        migration_call(&migration_notifier, CPU_ONLINE, cpu);
        register_cpu_notifier(&migration_notifier);