Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 29bd7fbc

include/linux/cpuhotplug.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

lib/irq_poll.c

+9 −17
Original line number Diff line number Diff line
@@ -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();

	}



	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);