ARM/OMAP/wakeupgen: Convert to hotplug state machine

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Cc: linux-omap@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20160906170457.32393-4-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/arm/mach-omap2/omap-wakeupgen.c

@@ -322,34 +322,25 @@ static void irq_save_secure_context(void)
 #endif
 
 #ifdef CONFIG_HOTPLUG_CPU
-static int irq_cpu_hotplug_notify(struct notifier_block *self,
-				  unsigned long action, void *hcpu)
+static int omap_wakeupgen_cpu_online(unsigned int cpu)
 {
-	unsigned int cpu = (unsigned int)hcpu;
-
-	/*
-	 * Corresponding FROZEN transitions do not have to be handled,
-	 * they are handled by at a higher level
-	 * (drivers/cpuidle/coupled.c).
-	 */
-	switch (action) {
-	case CPU_ONLINE:
-		wakeupgen_irqmask_all(cpu, 0);
-		break;
-	case CPU_DEAD:
-		wakeupgen_irqmask_all(cpu, 1);
-		break;
-	}
-	return NOTIFY_OK;
+	wakeupgen_irqmask_all(cpu, 0);
+	return 0;
 }
 
-static struct notifier_block irq_hotplug_notifier = {
-	.notifier_call = irq_cpu_hotplug_notify,
-};
+static int omap_wakeupgen_cpu_dead(unsigned int cpu)
+{
+	wakeupgen_irqmask_all(cpu, 1);
+	return 0;
+}
 
 static void __init irq_hotplug_init(void)
 {
-	register_hotcpu_notifier(&irq_hotplug_notifier);
+	cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "arm/omap-wake:online",
+				  omap_wakeupgen_cpu_online, NULL);
+	cpuhp_setup_state_nocalls(CPUHP_ARM_OMAP_WAKE_DEAD,
+				  "arm/omap-wake:dead", NULL,
+				  omap_wakeupgen_cpu_dead);
 }
 #else
 static void __init irq_hotplug_init(void)

include/linux/cpuhotplug.h

@@ -21,6 +21,7 @@ enum cpuhp_state {
 	CPUHP_NET_MVNETA_DEAD,
 	CPUHP_CPUIDLE_DEAD,
 	CPUHP_ARM64_FPSIMD_DEAD,
+	CPUHP_ARM_OMAP_WAKE_DEAD,
 	CPUHP_WORKQUEUE_PREP,
 	CPUHP_POWER_NUMA_PREPARE,
 	CPUHP_HRTIMERS_PREPARE,