Provide a default implementation for early_pfn_to_nid returning
node 0.  Allow architectures to override this with their own
implementation out of asm/mmzone.h.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>

diffstat generify-early_pfn_to_nid
---

diff -upN reference/arch/i386/Kconfig current/arch/i386/Kconfig
--- reference/arch/i386/Kconfig
+++ current/arch/i386/Kconfig
@@ -790,6 +790,10 @@ config HAVE_ARCH_ALLOC_REMAP
 
 source "mm/Kconfig"
 
+config HAVE_ARCH_EARLY_PFN_TO_NID
+	bool
+	default y
+
 config HIGHPTE
 	bool "Allocate 3rd-level pagetables from highmem"
 	depends on HIGHMEM4G || HIGHMEM64G
diff -upN reference/include/asm-i386/mmzone.h current/include/asm-i386/mmzone.h
--- reference/include/asm-i386/mmzone.h
+++ current/include/asm-i386/mmzone.h
@@ -143,4 +143,7 @@ static inline void get_memcfg_numa(void)
 }
 
 #endif /* CONFIG_DISCONTIGMEM */
+
+extern int early_pfn_to_nid(unsigned long pfn);
+
 #endif /* _ASM_MMZONE_H_ */
diff -upN reference/include/linux/mmzone.h current/include/linux/mmzone.h
--- reference/include/linux/mmzone.h
+++ current/include/linux/mmzone.h
@@ -428,6 +428,10 @@ extern struct pglist_data contig_page_da
 
 #endif
 
+#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
+#define early_pfn_to_nid(nid)  (0UL)
+#endif
+
 #endif /* !__ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MMZONE_H */