x86: move ack_bad_irq() to irq.c

[h-e-n] / arch / x86 / kernel / irq.c

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 3b91284..ccf6c50 100644 (file)
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -12,6 +12,29 @@
 
 atomic_t irq_err_count;
 
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+       printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
+
+#ifdef CONFIG_X86_LOCAL_APIC
+       /*
+        * Currently unexpected vectors happen only on SMP and APIC.
+        * We _must_ ack these because every local APIC has only N
+        * irq slots per priority level, and a 'hanging, unacked' IRQ
+        * holds up an irq slot - in excessive cases (when multiple
+        * unexpected vectors occur) that might lock up the APIC
+        * completely.
+        * But only ack when the APIC is enabled -AK
+        */
+       if (cpu_has_apic)
+               ack_APIC_irq();
+#endif
+}
+
 #ifdef CONFIG_X86_32
 # define irq_stats(x)          (&per_cpu(irq_stat,x))
 #else