No need for an extra notifier. Signed-off-by: Thomas Gleixner --- 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