[PATCH] x86-64/i386: Don't process APICs/IO-APICs in ACPI when APIC i…

…s disabled.

When nolapic was passed or the local APIC was disabled
for another reason ACPI would still parse the IO-APICs
until these were explicitely disabled with noapic.

Usually this resulted in a non booting configuration unless
"nolapic noapic" was used.

I also disabled the local APIC parsing in this case, although
that's only cosmetic (suppresses a few printks)

This hopefully makes nolapic work in all cases.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/acpi/boot.c

@@ -215,7 +215,7 @@ static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 {
 	struct acpi_table_madt *madt = NULL;
 
-	if (!phys_addr || !size)
+	if (!phys_addr || !size || !cpu_has_apic)
 		return -EINVAL;
 
 	madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
@@ -751,6 +751,9 @@ static int __init acpi_parse_madt_ioapic_entries(void)
 		return -ENODEV;
 	}
 
+	if (!cpu_has_apic)
+		return -ENODEV;
+
 	/*
 	 * if "noapic" boot option, don't look for IO-APICs
 	 */