[PATCH] Cleanup to make remove_memory() arch neutral

[Badari Pulavarty <pbadari@us.ibm.com>]

There is nothing architecture specific about remove_memory().
remove_memory() function is common for all architectures which
support hotplug memory remove. Instead of duplicating it in every
architecture, collapse them into arch neutral function.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>

 arch/ia64/mm/init.c   |   17 -----------------
 arch/powerpc/mm/mem.c |   17 -----------------
 arch/s390/mm/init.c   |   11 -----------
 mm/memory_hotplug.c   |   10 ++++++++++
 4 files changed, 10 insertions(+), 45 deletions(-)

Index: linux-2.6.27-rc5/arch/ia64/mm/init.c
===================================================================
--- linux-2.6.27-rc5.orig/arch/ia64/mm/init.c	2008-08-28 15:52:02.000000000 -0700
+++ linux-2.6.27-rc5/arch/ia64/mm/init.c	2008-09-08 12:38:59.000000000 -0700
@@ -701,23 +701,6 @@ 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
 
 /*
Index: linux-2.6.27-rc5/arch/powerpc/mm/mem.c
===================================================================
--- linux-2.6.27-rc5.orig/arch/powerpc/mm/mem.c	2008-08-28 15:52:02.000000000 -0700
+++ linux-2.6.27-rc5/arch/powerpc/mm/mem.c	2008-09-08 12:39:19.000000000 -0700
@@ -135,23 +135,6 @@ int arch_add_memory(int nid, u64 start, 
 
 	return __add_pages(zone, start_pfn, nr_pages);
 }
-
-#ifdef CONFIG_MEMORY_HOTREMOVE
-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;
-	/* Arch-specific calls go here - next patch */
-out:
-	return ret;
-}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
 /*
Index: linux-2.6.27-rc5/arch/s390/mm/init.c
===================================================================
--- linux-2.6.27-rc5.orig/arch/s390/mm/init.c	2008-08-28 15:52:02.000000000 -0700
+++ linux-2.6.27-rc5/arch/s390/mm/init.c	2008-09-08 12:40:41.000000000 -0700
@@ -189,14 +189,3 @@ int arch_add_memory(int nid, u64 start, 
 	return rc;
 }
 #endif /* CONFIG_MEMORY_HOTPLUG */
-
-#ifdef CONFIG_MEMORY_HOTREMOVE
-int remove_memory(u64 start, u64 size)
-{
-	unsigned long start_pfn, end_pfn;
-
-	start_pfn = PFN_DOWN(start);
-	end_pfn = start_pfn + PFN_DOWN(size);
-	return offline_pages(start_pfn, end_pfn, 120 * HZ);
-}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
Index: linux-2.6.27-rc5/mm/memory_hotplug.c
===================================================================
--- linux-2.6.27-rc5.orig/mm/memory_hotplug.c	2008-08-28 15:52:02.000000000 -0700
+++ linux-2.6.27-rc5/mm/memory_hotplug.c	2008-09-08 12:41:37.000000000 -0700
@@ -26,6 +26,7 @@
 #include <linux/delay.h>
 #include <linux/migrate.h>
 #include <linux/page-isolation.h>
+#include <linux/pfn.h>
 
 #include <asm/tlbflush.h>
 
@@ -849,6 +850,15 @@ failed_removal:
 
 	return ret;
 }
+
+int remove_memory(u64 start, u64 size)
+{
+	unsigned long start_pfn, end_pfn;
+
+	start_pfn = PFN_DOWN(start);
+	end_pfn = start_pfn + PFN_DOWN(size);
+	return offline_pages(start_pfn, end_pfn, 120 * HZ);
+}
 #else
 int remove_memory(u64 start, u64 size)
 {


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