NR_IRQS should be 16 when the IO apic is not configured, as the 8259 PIC
cannot generate any more interrupts. It also fixes a bug where the IDT
gets populated with random addresses, since only 16 entry stubs are
created.
--Brian Gerst
diff -urN linux-2.5.3-pre5/include/asm-i386/irq.h linux/include/asm-i386/irq.h --- linux-2.5.3-pre5/include/asm-i386/irq.h Fri Jan 25 02:25:47 2002 +++ linux/include/asm-i386/irq.h Fri Jan 25 11:30:44 2002 @@ -23,7 +23,11 @@ * Since vectors 0x00-0x1f are used/reserved for the CPU, * the usable vector space is 0x20-0xff (224 vectors) */ +#ifdef CONFIG_X86_IO_APIC #define NR_IRQS 224 +#else +#define NR_IRQS 16 +#endif static __inline__ int irq_cannonicalize(int irq) {
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