1 files changed, 39 insertions, 5 deletions

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 3973e2df7f87..f13ca1650aaf 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -6,10 +6,12 @@
 #include <linux/kernel_stat.h>
 #include <linux/seq_file.h>
 #include <linux/smp.h>
+#include <linux/ftrace.h>
 
 #include <asm/apic.h>
 #include <asm/io_apic.h>
 #include <asm/irq.h>
+#include <asm/idle.h>
 
 atomic_t irq_err_count;
 
@@ -36,11 +38,7 @@ void ack_bad_irq(unsigned int irq)
 #endif
 }
 
-#ifdef CONFIG_X86_32
-# define irq_stats(x)           (&per_cpu(irq_stat, x))
-#else
-# define irq_stats(x)           cpu_pda(x)
-#endif
+#define irq_stats(x)            (&per_cpu(irq_stat, x))
 /*
  * /proc/interrupts printing:
  */
@@ -192,4 +190,40 @@ u64 arch_irq_stat(void)
         return sum;
 }
 
+
+/*
+ * do_IRQ handles all normal device IRQ's (the special
+ * SMP cross-CPU interrupts have their own specific
+ * handlers).
+ */
+unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
+{
+        struct pt_regs *old_regs = set_irq_regs(regs);
+
+        /* high bit used in ret_from_ code  */
+        unsigned vector = ~regs->orig_ax;
+        unsigned irq;
+
+        exit_idle();
+        irq_enter();
+
+        irq = __get_cpu_var(vector_irq)[vector];
+
+        if (!handle_irq(irq, regs)) {
+#ifdef CONFIG_X86_64
+                if (!disable_apic)
+                        ack_APIC_irq();
+#endif
+
+                if (printk_ratelimit())
+                        printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n",
+                               __func__, smp_processor_id(), vector, irq);
+        }
+
+        irq_exit();
+
+        set_irq_regs(old_regs);
+        return 1;
+}
+
 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);