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x86/apic/uv: 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/20160906170457.32393-19-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-06 19:04:54 +02:00 committed by Thomas Gleixner
parent 84c9ceefec
commit b067a7be41
1 changed files with 6 additions and 25 deletions
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31
arch/x86/kernel/apic/x2apic_uv_x.c
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@ -927,7 +927,7 @@ static void uv_heartbeat(unsigned long ignored)
mod_timer(timer, jiffies + SCIR_CPU_HB_INTERVAL);
}
static void uv_heartbeat_enable(int cpu)
static int uv_heartbeat_enable(unsigned int cpu)
{
while (!uv_cpu_scir_info(cpu)->enabled) {
struct timer_list *timer = &uv_cpu_scir_info(cpu)->timer;
@ -941,43 +941,24 @@ static void uv_heartbeat_enable(int cpu)
/* also ensure that boot cpu is enabled */
cpu = 0;
}
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
static void uv_heartbeat_disable(int cpu)
static int uv_heartbeat_disable(unsigned int cpu)
{
if (uv_cpu_scir_info(cpu)->enabled) {
uv_cpu_scir_info(cpu)->enabled = 0;
del_timer(&uv_cpu_scir_info(cpu)->timer);
}
uv_set_cpu_scir_bits(cpu, 0xff);
}
/*
* cpu hotplug notifier
*/
static int uv_scir_cpu_notify(struct notifier_block *self, unsigned long action,
void *hcpu)
{
long cpu = (long)hcpu;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DOWN_FAILED:
case CPU_ONLINE:
uv_heartbeat_enable(cpu);
break;
case CPU_DOWN_PREPARE:
uv_heartbeat_disable(cpu);
break;
default:
break;
}
return NOTIFY_OK;
return 0;
}
static __init void uv_scir_register_cpu_notifier(void)
{
hotcpu_notifier(uv_scir_cpu_notify, 0);
cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/x2apic-uvx:online",
uv_heartbeat_enable, uv_heartbeat_disable);
}
#else /* !CONFIG_HOTPLUG_CPU */