[PATCH 1/3] Add remove_memory() for ppc64

[Badari Pulavarty]

Supply arch specific remove_memory() for PPC64. There is nothing
ppc specific code here and its exactly same as ia64 version. 
For now, lets keep it arch specific - so each arch can add
its own special things if needed.

Signed-off-by: Badari Pulavarty <pbadari at us.ibm.com>
---
 arch/powerpc/mm/mem.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: linux-2.6.23/arch/powerpc/mm/mem.c
===================================================================
--- linux-2.6.23.orig/arch/powerpc/mm/mem.c	2007-10-25 11:34:54.000000000 -0700
+++ linux-2.6.23/arch/powerpc/mm/mem.c	2007-10-25 11:35:24.000000000 -0700
@@ -131,6 +131,20 @@ int __devinit arch_add_memory(int nid, u
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int remove_memory(u64 start, u64 size)
+{
+	unsigned long start_pfn, end_pfn;
+	unsigned long timeout = 120 * HZ;
+	int ret;
+	start_pfn = start >> PAGE_SHIFT;
+	end_pfn = start_pfn + (size >> PAGE_SHIFT);
+	ret = offline_pages(start_pfn, end_pfn, timeout);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
+#endif /* CONFIG_MEMORY_HOTREMOVE */
+
 void show_mem(void)
 {
 	unsigned long total = 0, reserved = 0;