+#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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