forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Generic cpu hotunplug interrupt migration code copied from the
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* arch/arm implementation
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*
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* Copyright (C) Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/interrupt.h>
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#include <linux/ratelimit.h>
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#include <linux/irq.h>
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#include "internals.h"
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static bool migrate_one_irq(struct irq_desc *desc)
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{
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struct irq_data *d = irq_desc_get_irq_data(desc);
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const struct cpumask *affinity = d->common->affinity;
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struct irq_chip *c;
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bool ret = false;
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/*
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* If this is a per-CPU interrupt, or the affinity does not
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* include this CPU, then we have nothing to do.
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*/
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if (irqd_is_per_cpu(d) ||
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!cpumask_test_cpu(smp_processor_id(), affinity))
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return false;
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if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
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affinity = cpu_online_mask;
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ret = true;
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}
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c = irq_data_get_irq_chip(d);
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if (!c->irq_set_affinity) {
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pr_debug("IRQ%u: unable to set affinity\n", d->irq);
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} else {
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int r = irq_do_set_affinity(d, affinity, false);
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if (r)
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pr_warn_ratelimited("IRQ%u: set affinity failed(%d).\n",
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d->irq, r);
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}
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return ret;
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}
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/**
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* irq_migrate_all_off_this_cpu - Migrate irqs away from offline cpu
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*
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* The current CPU has been marked offline. Migrate IRQs off this CPU.
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* If the affinity settings do not allow other CPUs, force them onto any
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* available CPU.
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*
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* Note: we must iterate over all IRQs, whether they have an attached
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* action structure or not, as we need to get chained interrupts too.
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*/
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void irq_migrate_all_off_this_cpu(void)
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{
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unsigned int irq;
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struct irq_desc *desc;
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unsigned long flags;
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local_irq_save(flags);
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for_each_active_irq(irq) {
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bool affinity_broken;
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desc = irq_to_desc(irq);
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raw_spin_lock(&desc->lock);
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affinity_broken = migrate_one_irq(desc);
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raw_spin_unlock(&desc->lock);
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if (affinity_broken)
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pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n",
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irq, smp_processor_id());
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}
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local_irq_restore(flags);
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}
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