kernel: Don't allow IRQ affinity masks to have more than one CPU
Even with an affinity mask that has multiple CPUs set, IRQs always run on the first CPU in their affinity mask. Drivers that register an IRQ affinity notifier (such as pm_qos) will therefore have an incorrect assumption of where an IRQ is affined. Fix the IRQ affinity mask deception by forcing it to only contain one set CPU. Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
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@ -241,6 +241,8 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
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if (!chip || !chip->irq_set_affinity)
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return -EINVAL;
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/* IRQs only run on the first CPU in the affinity mask; reflect that */
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mask = cpumask_of(cpumask_first(mask));
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ret = chip->irq_set_affinity(data, mask, force);
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switch (ret) {
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case IRQ_SET_MASK_OK:
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