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lib/irq_poll: 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: Jens Axboe <axboe@kernel.dk>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-8-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-06 19:04:43 +02:00 committed by Thomas Gleixner
parent 29bd7fbc07
commit 75e12ed653
2 changed files with 10 additions and 17 deletions
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1
include/linux/cpuhotplug.h
View File

@ -22,6 +22,7 @@ enum cpuhp_state {
CPUHP_CPUIDLE_DEAD, CPUHP_CPUIDLE_DEAD,
CPUHP_ARM64_FPSIMD_DEAD, CPUHP_ARM64_FPSIMD_DEAD,
CPUHP_ARM_OMAP_WAKE_DEAD, CPUHP_ARM_OMAP_WAKE_DEAD,
CPUHP_IRQ_POLL_DEAD,
CPUHP_WORKQUEUE_PREP, CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE, CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE, CPUHP_HRTIMERS_PREPARE,

16
lib/irq_poll.c
View File

@ -184,30 +184,21 @@ void irq_poll_init(struct irq_poll *iop, int weight, irq_poll_fn *poll_fn)
} }
EXPORT_SYMBOL(irq_poll_init); EXPORT_SYMBOL(irq_poll_init);
static int irq_poll_cpu_notify(struct notifier_block *self, static int irq_poll_cpu_dead(unsigned int cpu)
unsigned long action, void *hcpu)
{ {
/* /*
* If a CPU goes away, splice its entries to the current CPU * If a CPU goes away, splice its entries to the current CPU
* and trigger a run of the softirq * and trigger a run of the softirq
*/ */
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
int cpu = (unsigned long) hcpu;
local_irq_disable(); local_irq_disable();
list_splice_init(&per_cpu(blk_cpu_iopoll, cpu), list_splice_init(&per_cpu(blk_cpu_iopoll, cpu),
this_cpu_ptr(&blk_cpu_iopoll)); this_cpu_ptr(&blk_cpu_iopoll));
__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ); __raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_enable(); 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) static __init int irq_poll_setup(void)
{ {
int i; int i;
@ -216,7 +207,8 @@ static __init int irq_poll_setup(void)
INIT_LIST_HEAD(&per_cpu(blk_cpu_iopoll, i)); INIT_LIST_HEAD(&per_cpu(blk_cpu_iopoll, i));
open_softirq(IRQ_POLL_SOFTIRQ, irq_poll_softirq); 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; return 0;
} }
subsys_initcall(irq_poll_setup); subsys_initcall(irq_poll_setup);