[PATCH] x86: don't print strange not connect ioapic

[Yinghai Lu <yinghai@kernel.org>]

in setup_IO_APIC_irqs(), we only need to go with ioapic that handle legacy irqs,
because at that points we only have those irq in mp_irqs[]

will not print out those strange not connected pin warning.

[ Impact: don't go with not used ioapic yet ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 arch/x86/kernel/apic/io_apic.c |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -1477,10 +1477,27 @@ static void __init setup_IO_APIC_irqs(vo
 	struct irq_desc *desc;
 	struct irq_cfg *cfg;
 	int node = cpu_to_node(boot_cpu_id);
+	int ioapic_start = 0, ioapic_end = nr_ioapics;
 
 	apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
 
-	for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {
+#ifdef CONFIG_ACPI
+	/*
+	 * when acpi is used, at this point, we only have legacy entries
+	 * in mp_irqs[] by mp_config_acpi_legacy_irqs/mp_override_legacy_irq
+	 * so only setup for that ioapic, and will not print out those strange
+	 * not connected on other ioapic
+	 */
+	if (!acpi_disabled && acpi_ioapic) {
+		ioapic_start = mp_find_ioapic(0);
+		if (ioapic_start < 0)
+			ioapic_start = 0;
+		else
+			ioapic_end = ioapic_start + 1;
+	}
+#endif
+
+	for (apic_id = ioapic_start; apic_id < ioapic_end; apic_id++) {
 		for (pin = 0; pin < nr_ioapic_registers[apic_id]; pin++) {
 
 			idx = find_irq_entry(apic_id, pin, mp_INT);