Re: [1/3] add early_pfn_to_nid for ppc64

[Joel Schopp]

> +#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
> +#define early_pfn_to_nid(pfn)  pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
> +#endif

Is there a reason we didn't just use pfn_to_nid() directly here instead 
of pa_to_nid()?  I'm just thinking of having DISCONTIG/NUMA off and 
pfn_to_nid() being #defined to zero for those cases.

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