[patch 14/15] sched/fair: Make ilb_notifier an explicit call

[Thomas Gleixner]

No need for an extra notifier.

Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
 kernel/sched/core.c  |    1 +
 kernel/sched/fair.c  |   15 +--------------
 kernel/sched/sched.h |    4 ++++
 3 files changed, 6 insertions(+), 14 deletions(-)

Index: b/kernel/sched/core.c
===================================================================
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7363,6 +7363,7 @@ int sched_cpu_dying(unsigned int cpu)
        raw_spin_unlock_irqrestore(&rq->lock, flags);
        calc_load_migrate(rq);
        update_max_interval();
+       nohz_balance_exit_idle(cpu);
        return 0;
 }
 
Index: b/kernel/sched/fair.c
===================================================================
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7602,7 +7602,7 @@ static void nohz_balancer_kick(void)
        return;
 }
 
-static inline void nohz_balance_exit_idle(int cpu)
+void nohz_balance_exit_idle(unsigned int cpu)
 {
        if (unlikely(test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))) {
                /*
@@ -7675,18 +7675,6 @@ void nohz_balance_enter_idle(int cpu)
        atomic_inc(&nohz.nr_cpus);
        set_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
 }
-
-static int sched_ilb_notifier(struct notifier_block *nfb,
-                                       unsigned long action, void *hcpu)
-{
-       switch (action & ~CPU_TASKS_FROZEN) {
-       case CPU_DYING:
-               nohz_balance_exit_idle(smp_processor_id());
-               return NOTIFY_OK;
-       default:
-               return NOTIFY_DONE;
-       }
-}
 #endif
 
 static DEFINE_SPINLOCK(balancing);
@@ -8486,7 +8474,6 @@ void show_numa_stats(struct task_struct
 #ifdef CONFIG_NO_HZ_COMMON
        nohz.next_balance = jiffies;
        zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
-       cpu_notifier(sched_ilb_notifier, 0);
 #endif
 #endif /* SMP */
 
Index: b/kernel/sched/sched.h
===================================================================
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1688,6 +1688,10 @@ enum rq_nohz_flag_bits {
 };
 
 #define nohz_flags(cpu)        (&cpu_rq(cpu)->nohz_flags)
+
+extern void nohz_balance_exit_idle(unsigned int cpu);
+#else
+static inline void nohz_balance_exit_idle(unsigned int cpu) { }
 #endif
 
 #ifdef CONFIG_IRQ_TIME_ACCOUNTING