Messages in this thread | | | Date | Sun, 27 Jan 2002 19:51:29 -0500 | From | Brian Gerst <> | Subject | Re: [PATCH] Fix NR_IRQS when no IO apic |
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Jeff Garzik wrote: > > Brian Gerst wrote: > > > > 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. > > > +#ifdef CONFIG_X86_IO_APIC > > #define NR_IRQS 224 > > +#else > > +#define NR_IRQS 16 > > +#endif > > What about when ioapic is configured but not present?
No problem, just wasted memory. With CONFIG_X86_IO_APIC, all 224 entry stubs are created. See arch/i386/kernel/i8259.c
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