[patch 09/15] sched/migration: Move prepare transition to SCHED_STARTING state

[Thomas Gleixner]

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@xxxxxxxxxxxxx>
---
 kernel/sched/core.c |   20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5662,11 +5662,6 @@ migration_call(struct notifier_block *nf
 
 	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);
@@ -7372,9 +7367,19 @@ int sched_cpu_deactivate(unsigned int cp
 	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;
 }
 
@@ -7415,11 +7420,8 @@ 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);