common_interrupt: No irq handler for vector

[Shuah Khan]

I am debugging __common_interrupt: 1.55 No irq handler for vector
messages and noticed comments and code don't agree:

arch/x86/kernel/apic/msi.c: msi_set_affinity() says:


 * If the vector is in use then the installed device handler will
 * denote it as spurious which is no harm as this is a rare event
 * and interrupt handlers have to cope with spurious interrupts
 * anyway. If the vector is unused, then it is marked so it won't
 * trigger the 'No irq handler for vector' warning in
 * common_interrupt().

common_interrupt() prints message if vector is unused: VECTOR_UNUSED

ack_APIC_irq();

if (desc == VECTOR_UNUSED) {
    pr_emerg_ratelimited("%s: %d.%u No irq handler for vector\n",
                          __func__, smp_processor_id(), vector);
}

Something wrong here?

thanks,
-- Shuah