x86: unify do_IRQ()

With the differences in interrupt handling hoisted into handle_irq(),
do_IRQ is more or less identical between 32 and 64 bit, so unify it.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/irq.h

@@ -36,11 +36,12 @@ static inline int irq_canonicalize(int irq)
 extern void fixup_irqs(void);
 #endif
 
-extern unsigned int do_IRQ(struct pt_regs *regs);
 extern void init_IRQ(void);
 extern void native_init_IRQ(void);
 extern bool handle_irq(unsigned irq, struct pt_regs *regs);
 
+extern unsigned int do_IRQ(struct pt_regs *regs);
+
 /* Interrupt vector management */
 extern DECLARE_BITMAP(used_vectors, NR_VECTORS);
 extern int vector_used_by_percpu_irq(unsigned int vector);

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;
 
@@ -188,4 +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);

arch/x86/kernel/irq_32.c

@@ -211,33 +211,6 @@ bool handle_irq(unsigned irq, struct pt_regs *regs)
 	return true;
 }
 
-/*
- * do_IRQ handles all normal device IRQ's (the special
- * SMP cross-CPU interrupts have their own specific
- * handlers).
- */
-unsigned int do_IRQ(struct pt_regs *regs)
-{
-	struct pt_regs *old_regs;
-	/* high bit used in ret_from_ code */
-	unsigned vector = ~regs->orig_ax;
-	unsigned irq;
-
-	old_regs = set_irq_regs(regs);
-	irq_enter();
-	irq = __get_cpu_var(vector_irq)[vector];
-
-	if (!handle_irq(irq, regs)) {
-		printk(KERN_EMERG "%s: cannot handle IRQ %d vector %#x cpu %d\n",
-					__func__, irq, vector, smp_processor_id());
-		BUG();
-	}
-
-	irq_exit();
-	set_irq_regs(old_regs);
-	return 1;
-}
-
 #ifdef CONFIG_HOTPLUG_CPU
 #include <asm/genapic.h>
 

arch/x86/kernel/irq_64.c

@@ -62,39 +62,6 @@ bool handle_irq(unsigned irq, struct pt_regs *regs)
 	return true;
 }
 
-/*
- * do_IRQ handles all normal device IRQ's (the special
- * SMP cross-CPU interrupts have their own specific
- * handlers).
- */
-asmlinkage 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)) {
-		if (!disable_apic)
-			ack_APIC_irq();
-
-		if (printk_ratelimit())
-			printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",
-				__func__, smp_processor_id(), vector);
-	}
-
-	irq_exit();
-
-	set_irq_regs(old_regs);
-	return 1;
-}
-
 #ifdef CONFIG_HOTPLUG_CPU
 /* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
 void fixup_irqs(void)