From: Badari Pulavarty <pbadari@us.ibm.com>

remove_memory() is common across ia64, ppc64.  There is no point in
providing exactly same arch-specific routines.  Make this generic and add
arch-specific hooks if needed by any other archs.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/ia64/mm/init.c |   17 -----------------
 mm/memory_hotplug.c |   16 ++++++++++++++++
 2 files changed, 16 insertions(+), 17 deletions(-)

diff -puN arch/ia64/mm/init.c~add-remove_memory-for-ppc64-2 arch/ia64/mm/init.c
--- a/arch/ia64/mm/init.c~add-remove_memory-for-ppc64-2
+++ a/arch/ia64/mm/init.c
@@ -718,21 +718,4 @@ int arch_add_memory(int nid, u64 start, 
 
 	return ret;
 }
-#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);
-	if (ret)
-		goto out;
-	/* we can free mem_map at this point */
-out:
-	return ret;
-}
-EXPORT_SYMBOL_GPL(remove_memory);
-#endif /* CONFIG_MEMORY_HOTREMOVE */
 #endif
diff -puN mm/memory_hotplug.c~add-remove_memory-for-ppc64-2 mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~add-remove_memory-for-ppc64-2
+++ a/mm/memory_hotplug.c
@@ -653,6 +653,22 @@ failed_removal:
 
 	return ret;
 }
+
+int remove_memory(u64 start, u64 size)
+{
+	unsigned long start_pfn, end_pfn;
+	int ret;
+
+	start_pfn = start >> PAGE_SHIFT;
+	end_pfn = start_pfn + (size >> PAGE_SHIFT);
+	ret = offline_pages(start_pfn, end_pfn, 120 * HZ);
+	if (ret)
+		goto out;
+	/* we can free mem_map at this point */
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
 #else
 int remove_memory(u64 start, u64 size)
 {
_