Commit 75e12ed6 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner

lib/irq_poll: Convert to hotplug state machine

Install the callbacks via the state machine.
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-8-bigeasy@linutronix.deSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 29bd7fbc
......@@ -22,6 +22,7 @@ enum cpuhp_state {
CPUHP_CPUIDLE_DEAD,
CPUHP_ARM64_FPSIMD_DEAD,
CPUHP_ARM_OMAP_WAKE_DEAD,
CPUHP_IRQ_POLL_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,
......
......@@ -184,30 +184,21 @@ void irq_poll_init(struct irq_poll *iop, int weight, irq_poll_fn *poll_fn)
}
EXPORT_SYMBOL(irq_poll_init);
static int irq_poll_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
static int irq_poll_cpu_dead(unsigned int cpu)
{
/*
* If a CPU goes away, splice its entries to the current CPU
* and trigger a run of the softirq
*/
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
int cpu = (unsigned long) hcpu;
local_irq_disable();
list_splice_init(&per_cpu(blk_cpu_iopoll, cpu),
this_cpu_ptr(&blk_cpu_iopoll));
__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_enable();
}
local_irq_disable();
list_splice_init(&per_cpu(blk_cpu_iopoll, cpu),
this_cpu_ptr(&blk_cpu_iopoll));
__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_enable();
return NOTIFY_OK;
return 0;
}
static struct notifier_block irq_poll_cpu_notifier = {
.notifier_call = irq_poll_cpu_notify,
};
static __init int irq_poll_setup(void)
{
int i;
......@@ -216,7 +207,8 @@ static __init int irq_poll_setup(void)
INIT_LIST_HEAD(&per_cpu(blk_cpu_iopoll, i));
open_softirq(IRQ_POLL_SOFTIRQ, irq_poll_softirq);
register_hotcpu_notifier(&irq_poll_cpu_notifier);
cpuhp_setup_state_nocalls(CPUHP_IRQ_POLL_DEAD, "irq_poll:dead", NULL,
irq_poll_cpu_dead);
return 0;
}
subsys_initcall(irq_poll_setup);
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