The main problem is that Xenomai redefines ack_APIC_irq() calls (they become NOPs, as defined in apic.h). Maybe the ISRs used so far never issued ack_APIC_irq() themselves, and used always the IO-APIC (which contains the correct __ack_APIC_irq() call) ?
I feel a bit awkward about changing msi.c .
Any opinions about how to change Xenomai / Linux ?
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