x86: introduce smpboot_clear_io_apic

x86_64 has two nr_ioapics = 0 statements. In 32-bit, it can be done
too. We do it through the smpboot_clear_io_apic() inline function,
to cope with subarchitectures (visws) that does not compile mpparse in

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index ae23b603978c..5a0f57f35191 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -155,6 +155,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
 		printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
 			boot_cpu_physical_apicid);
 		printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
+		smpboot_clear_io_apic();
 		return -1;
 	}
 
@@ -173,6 +174,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
 			setup_local_APIC();
 			end_local_APIC_setup();
 		}
+		smpboot_clear_io_apic();
 		return -1;
 	}
 	return 0;