From: Keith Mannthey <kmannth@us.ibm.com>

This patch set allow SPARSEMEM and RESERVE based hot-add to work.  I have
test both options and they work as expected.  I am adding memory to the
2nd node of a numa system (x86_64).

Major changes from last set is the config change and RESERVE enablment.


This patch:


Make ACPI motherboard driver not attach to devices/handles it dosen't expect.
Fix a bug where the motherboard driver attached to hot-add memory event and
caused the add memory call to fail.

Signed-off-by: Keith Mannthey<kmannth@us.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---


diff -puN drivers/acpi/motherboard.c~hot-add-mem-x86_64-acpi-motherboard-fix drivers/acpi/motherboard.c
--- a/drivers/acpi/motherboard.c~hot-add-mem-x86_64-acpi-motherboard-fix
+++ a/drivers/acpi/motherboard.c
@@ -87,6 +87,7 @@ static acpi_status acpi_reserve_io_range
 		}
 	} else {
 		/* Memory mapped IO? */
+		 return -EINVAL;
 	}
 
 	if (requested_res)
@@ -96,11 +97,16 @@ static acpi_status acpi_reserve_io_range
 
 static int acpi_motherboard_add(struct acpi_device *device)
 {
+	acpi_status status;
 	if (!device)
 		return -EINVAL;
-	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+
+	status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 			    acpi_reserve_io_ranges, NULL);
 
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
 	return 0;
 }
 
_