[PATCH] P4 SPIV FOCUS bit

From Zwane Mwaikambo, this diff makes sure we don't
poke reserved bits on the P4.

arch/i386/kernel/apic.c

@@ -273,7 +273,10 @@ void __init init_bsp_APIC(void)
 	value = apic_read(APIC_SPIV);
 	value &= ~APIC_VECTOR_MASK;
 	value |= APIC_SPIV_APIC_ENABLED;
-	value |= APIC_SPIV_FOCUS_DISABLED;
+	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 == 15))
+		value &= ~APIC_SPIV_FOCUS_DISABLED;
+	else
+		value |= APIC_SPIV_FOCUS_DISABLED;
 	value |= SPURIOUS_APIC_VECTOR;
 	apic_write_around(APIC_SPIV, value);