Release 4.11 kernel/irq/migration.c

#include <linux/irq.h>
#include <linux/interrupt.h>

#include "internals.h"



void irq_move_masked_irq(struct irq_data *idata)
{
	struct irq_desc *desc = irq_data_to_desc(idata);
	struct irq_chip *chip = desc->irq_data.chip;

	if (likely(!irqd_is_setaffinity_pending(&desc->irq_data)))
		return;

	irqd_clr_move_pending(&desc->irq_data);

	/*
         * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
         */
	if (irqd_is_per_cpu(&desc->irq_data)) {
		WARN_ON(1);
		return;
	}

	if (unlikely(cpumask_empty(desc->pending_mask)))
		return;

	if (!chip->irq_set_affinity)
		return;

	assert_raw_spin_locked(&desc->lock);

	/*
         * If there was a valid mask to work with, please
         * do the disable, re-program, enable sequence.
         * This is *not* particularly important for level triggered
         * but in a edge trigger case, we might be setting rte
         * when an active trigger is coming in. This could
         * cause some ioapics to mal-function.
         * Being paranoid i guess!
         *
         * For correct operation this depends on the caller
         * masking the irqs.
         */
	if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids)
		irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);

	cpumask_clear(desc->pending_mask);
}

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void irq_move_irq(struct irq_data *idata)
{
	bool masked;

	/*
         * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled,
         * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is
         * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here.
         */
	idata = irq_desc_get_irq_data(irq_data_to_desc(idata));

	if (likely(!irqd_is_setaffinity_pending(idata)))
		return;

	if (unlikely(irqd_irq_disabled(idata)))
		return;

	/*
         * Be careful vs. already masked interrupts. If this is a
         * threaded interrupt with ONESHOT set, we can end up with an
         * interrupt storm.
         */
	masked = irqd_irq_masked(idata);
	if (!masked)
		idata->chip->irq_mask(idata);
	irq_move_masked_irq(idata);
	if (!masked)
		idata->chip->irq_unmask(idata);
}
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16.67%
Bryan Holty
5
5.68%
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8.33%
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2
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41.67%
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51
21.79%
1
4.17%
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26
11.11%
1
4.17%
Yinghai Lu
18
7.69%
2
8.33%
Jiang Liu
15
6.41%
2
8.33%
Eric W. Biedermann
15
6.41%
2
8.33%
Rusty Russell
11
4.70%
1
4.17%
Ingo Molnar
6
2.56%
3
12.50%
Lucas De Marchi
1
0.43%
1
4.17%
Daniel Walker
1
0.43%
1
4.17%
Total
234
100.00%
24
100.00%
Directory: kernel/irq

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