[PATCH] APIC ID fixes

1) apic_write_around(APIC_ID, boot_cpu_physical_apicid) places the APIC
value in the lower 8 bits of APIC_ID, when it should be in the upper 8. As
as result, it effectively forces the APIC id to always be 0 for the boot
CPU, which is fatal on SMP AMD boxes.

 Fix: don't do the write at all. The APIC_ID value should be right already.

2) phys_cpu_present_map = 1 means we always set bit 0, but later on
   in setup_local_APIC() we do
        if (!clustered_apic_mode &&
            !test_bit(GET_APIC_ID(apic_read(APIC_ID)), &phys_cpu_present_map))
                BUG();
and the bug is triggered if the APIC_ID is not zero.

 Fix: initialize 'phys_cpu_present_map' correctly.

arch/i386/kernel/apic.c

@@ -665,7 +665,6 @@ static int __init detect_init_APIC (void)
 	}
 	set_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
 	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-	boot_cpu_physical_apicid = 0;
 	if (nmi_watchdog != NMI_NONE)
 		nmi_watchdog = NMI_LOCAL_APIC;
 
@@ -1154,8 +1153,7 @@ int __init APIC_init_uniprocessor (void)
 
 	connect_bsp_APIC();
 
-	phys_cpu_present_map = 1;
-	apic_write_around(APIC_ID, boot_cpu_physical_apicid);
+	phys_cpu_present_map = 1 << boot_cpu_physical_apicid;
 
 	apic_pm_init2();