unified percpu stuff

[Jeremy Fitzhardinge]

I'm really pleased to see the unified percpu stuff in the kernel, but 
unfortunately its breaking Xen at the moment. 

It looks like this is just a matter of initializing %gs properly in 
xen_start_kernel.  Is there any problem with me doing a load_gs_base(0) 
somewhere early in xen_start_kernel (arch/x86/xen/enlighten.c)?  Is the 
initial percpu are and offset for cpu0 all set up?  Do I need to make it 
#ifdef CONFIG_SMP?

Do I need to do anything for 32-bit? (I haven't tested that yet.)

Thanks,
   J


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