x86/vector: Add a sanity check to prevent IRQ2 allocations
To prevent another incidental removal of the IRQ2 ignore logic in the IO/APIC code going unnoticed add a sanity check. Add some commentry at the other place which ignores IRQ2 while at it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20210318192819.795280387@linutronix.de
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