Is an IRQ line disabled on local CPU or globally?

[Parmenides <mobile.parmenides@xxxxxxxxx>]

Hi,

     It is said that an IRQ line is disabled when the same IRQ line is
in process. But, is the IRQ line disabled on the local CPU or all
CPUs? Another relevant question is that the disable_irq() funciton
will disable an IRQ line on local CPU or all CPUs.

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