Don't cache align PDA on UP builds

Suggested by someone I forgot who sorry.


Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/include/asm-x86_64/pda.h
===================================================================
--- linux.orig/include/asm-x86_64/pda.h
+++ linux/include/asm-x86_64/pda.h
@@ -22,7 +22,7 @@ struct x8664_pda {
 	struct mm_struct *active_mm;
 	int mmu_state;     
 	unsigned apic_timer_irqs;
-} ____cacheline_aligned;
+} ____cacheline_aligned_in_smp;
 
 
 #define IRQSTACK_ORDER 2