kernel/softirq: Convert to hotplug state machine
Install the callbacks via the state machine. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160818125731.27256-7-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -17,6 +17,7 @@ enum cpuhp_state {
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CPUHP_VIRT_NET_DEAD,
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CPUHP_SLUB_DEAD,
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CPUHP_MM_WRITEBACK_DEAD,
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CPUHP_SOFTIRQ_DEAD,
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CPUHP_WORKQUEUE_PREP,
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CPUHP_POWER_NUMA_PREPARE,
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CPUHP_HRTIMERS_PREPARE,
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@ -700,7 +700,7 @@ void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu)
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BUG();
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}
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static void takeover_tasklets(unsigned int cpu)
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static int takeover_tasklets(unsigned int cpu)
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{
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/* CPU is dead, so no lock needed. */
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local_irq_disable();
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@ -723,27 +723,12 @@ static void takeover_tasklets(unsigned int cpu)
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raise_softirq_irqoff(HI_SOFTIRQ);
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local_irq_enable();
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return 0;
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}
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#else
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#define takeover_tasklets NULL
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#endif /* CONFIG_HOTPLUG_CPU */
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static int cpu_callback(struct notifier_block *nfb, unsigned long action,
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void *hcpu)
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{
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switch (action) {
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#ifdef CONFIG_HOTPLUG_CPU
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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takeover_tasklets((unsigned long)hcpu);
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break;
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#endif /* CONFIG_HOTPLUG_CPU */
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}
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return NOTIFY_OK;
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}
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static struct notifier_block cpu_nfb = {
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.notifier_call = cpu_callback
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};
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static struct smp_hotplug_thread softirq_threads = {
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.store = &ksoftirqd,
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.thread_should_run = ksoftirqd_should_run,
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@ -753,8 +738,8 @@ static struct smp_hotplug_thread softirq_threads = {
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static __init int spawn_ksoftirqd(void)
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{
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register_cpu_notifier(&cpu_nfb);
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cpuhp_setup_state_nocalls(CPUHP_SOFTIRQ_DEAD, "softirq:dead", NULL,
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takeover_tasklets);
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BUG_ON(smpboot_register_percpu_thread(&softirq_threads));
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return 0;
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