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@@ -20,6 +20,26 @@
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atomic_t irq_err_count;
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atomic_t irq_err_count;
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+/*
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+ * 'what should we do if we get a hw irq event on an illegal vector'.
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+ * each architecture has to answer this themselves.
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+ */
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+void ack_bad_irq(unsigned int irq)
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+{
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+ printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
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+ /*
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+ * Currently unexpected vectors happen only on SMP and APIC.
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+ * We _must_ ack these because every local APIC has only N
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+ * irq slots per priority level, and a 'hanging, unacked' IRQ
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+ * holds up an irq slot - in excessive cases (when multiple
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+ * unexpected vectors occur) that might lock up the APIC
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+ * completely.
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+ * But don't ack when the APIC is disabled. -AK
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+ */
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+ if (!disable_apic)
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+ ack_APIC_irq();
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+}
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+
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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/*
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/*
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* Probabilistic stack overflow check:
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* Probabilistic stack overflow check:
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