x86: add debug info for 32bit sparse_irq

so could figure out bugs where we get an interrupt, but vector_irq is
not initialized yet.
Signed-off-by: Yinghai Lu  <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/io_apic_32.c

@@ -1114,8 +1114,12 @@ static int __assign_irq_vector(int irq, cpumask_t mask)
                         cfg->move_in_progress = 1;
                         cfg->old_domain = cfg->domain;
                 }
-                for_each_cpu_mask_nr(new_cpu, new_mask)
-                        per_cpu(vector_irq, new_cpu)[vector] = irq;
+		printk(KERN_DEBUG "assign_irq_vector: irq %d vector %#x cpu ", irq, vector);
+		for_each_cpu_mask_nr(new_cpu, new_mask) {
+			per_cpu(vector_irq, new_cpu)[vector] = irq;
+			printk(KERN_CONT " %d ", new_cpu);
+		}
+		printk(KERN_CONT "\n");
                 cfg->vector = vector;
                 cfg->domain = domain;
                 return 0;

arch/x86/kernel/io_apic_64.c

@@ -1394,6 +1394,8 @@ __apicdebuginit(void) print_IO_APIC(void)
 	printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid);
 	printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
 	printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
+	printk(KERN_DEBUG ".......    : Delivery Type: %X\n", reg_00.bits.delivery_type);
+	printk(KERN_DEBUG ".......    : LTS          : %X\n", reg_00.bits.LTS);
 
 	printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
 	printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);

arch/x86/kernel/irq_32.c

@@ -237,8 +237,8 @@ unsigned int do_IRQ(struct pt_regs *regs)
 
 	desc = irq_to_desc(irq);
 	if (unlikely(!desc)) {
-		printk(KERN_EMERG "%s: cannot handle IRQ %d vector %#x\n",
-					__func__, irq, vector);
+		printk(KERN_EMERG "%s: cannot handle IRQ %d vector %#x cpu %d\n",
+					__func__, irq, vector, smp_processor_id());
 		BUG();
 	}