MAX_IO_APICS 88 arch/x86/include/asm/fixmap.h FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, MAX_IO_APICS 154 arch/x86/include/asm/irq_vectors.h #define IO_APIC_VECTOR_LIMIT ( 32 * MAX_IO_APICS )