[1/3] add early_pfn_to_nid for ppc64

[Andy Whitcroft]

Provide an implementation of early_pfn_to_nid for PPC64.  This is
used by memory models to determine the node from which to take
allocations before the memory allocators are fully initialised.

Signed-off-by: Andy Whitcroft <apw at shadowen.org>
Signed-off-by: Dave Hansen <haveblue at us.ibm.com>
Signed-off-by: Martin Bligh <mbligh at aracnet.com>
---
 arch/ppc64/Kconfig         |    4 ++++
 include/asm-ppc64/mmzone.h |    5 +++++
 2 files changed, 9 insertions(+)

diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/ppc64/Kconfig current/arch/ppc64/Kconfig
--- reference/arch/ppc64/Kconfig	2005-05-04 20:54:41.000000000 +0100
+++ current/arch/ppc64/Kconfig	2005-05-04 20:54:48.000000000 +0100
@@ -211,6 +211,10 @@ config ARCH_FLATMEM_ENABLE
 
 source "mm/Kconfig"
 
+config HAVE_ARCH_EARLY_PFN_TO_NID
+	bool
+	default y
+
 # Some NUMA nodes have memory ranges that span
 # other nodes.  Even though a pfn is valid and
 # between a node's start and end pfns, it may not
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-ppc64/mmzone.h current/include/asm-ppc64/mmzone.h
--- reference/include/asm-ppc64/mmzone.h	2005-05-04 20:54:41.000000000 +0100
+++ current/include/asm-ppc64/mmzone.h	2005-05-04 20:54:48.000000000 +0100
@@ -90,4 +90,9 @@ static inline int pa_to_nid(unsigned lon
 #define discontigmem_pfn_valid(pfn)		((pfn) < num_physpages)
 
 #endif /* CONFIG_DISCONTIGMEM */
+
+#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
+#define early_pfn_to_nid(pfn)  pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
+#endif
+
 #endif /* _ASM_MMZONE_H_ */