We should remove the following things when removing the memory device:
1. memmap and related sysfs files
2. iomem_resource
3. mem_section and related sysfs files
4. node and related sysfs files

The function remove_memory() can do this. So call it after the memory device
is offlined.

CC: David Rientjes <rientjes@google.com>
CC: Jiang Liu <redacted>
CC: Len Brown <redacted>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <redacted>
CC: Christoph Lameter <redacted>
Cc: Minchan Kim <redacted>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: KOSAKI Motohiro <redacted>
CC: Yasuaki Ishimatsu <redacted>
Signed-off-by: Wen Congyang <redacted>
---
 drivers/acpi/acpi_memhotplug.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 712e767..58e4e63 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c

@@ -315,7 +315,7 @@ static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
 {
 	int result;
 	struct acpi_memory_info *info, *n;
-
+	int node = mem_device->nid;
 
 	/*
 	 * Ask the VM to offline this memory range.

@@ -330,6 +330,11 @@ static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
 				if (result)
 					return result;
 			}
+
+			result = remove_memory(node, info->start_addr,
+					       info->length);
+			if (result)
+				return result;
 		}
 		list_del(&info->list);
 		kfree(info);

-- 
1.7.1