UV X2APIC uses the per CPU variable from:

  native_smp_prepare_cpus()
    uv_system_init()
      uv_system_init_hub()

which is long after the per CPU areas have been set up.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/kernel/apic/x2apic_uv_x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1843,7 +1843,7 @@ static void __init uv_system_init_hub(vo
 
 	/* Initialize per CPU info: */
 	for_each_possible_cpu(cpu) {
-		int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
+		int apicid = per_cpu(x86_cpu_to_apicid, cpu);
 		unsigned short bid;
 		unsigned short pnode;