[PATCH] i386: Fix compilation with UP genericarch

Fix

arch/i386/mach-generic/built-in.o: In function `apicid_to_node':
summit.c:(.text+0x2f): undefined reference to `apicid_2_node'

with CONFIG_GENERICH_ARCH and !CONFIG_SMP
Signed-off-by: Andi Kleen <ak@suse.de>

include/asm-i386/mach-summit/mach_apic.h

@@ -88,7 +88,11 @@ static inline void clustered_apic_check(void)
 
 static inline int apicid_to_node(int logical_apicid)
 {
+#ifdef CONFIG_SMP
 	return apicid_2_node[hard_smp_processor_id()];
+#else
+	return 0;
+#endif
 }
 
 /* Mapping from cpu number to logical apicid */