From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
For hot removing physical memory, the patch adds remove_memory() into
acpi_memory_remove_memory(). But we cannot support physical memory
hot remove. So remove_memory() do nothinig.
CC: David Rientjes <rientjes@xxxxxxxxxx>
CC: Jiang Liu <liuj97@xxxxxxxxx>
CC: Len Brown <len.brown@xxxxxxxxx>
CC: Christoph Lameter <cl@xxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
---
drivers/acpi/acpi_memhotplug.c | 10 ++++++++++
include/linux/memory_hotplug.h | 5 +++++
mm/memory_hotplug.c | 7 +++++++
3 files changed, 22 insertions(+)
Index: linux-3.6/drivers/acpi/acpi_memhotplug.c
===================================================================
--- linux-3.6.orig/drivers/acpi/acpi_memhotplug.c 2012-10-03 19:03:10.960400793 +0900
+++ linux-3.6/drivers/acpi/acpi_memhotplug.c 2012-10-03 19:03:26.818401966 +0900
@@ -310,6 +310,9 @@ static int acpi_memory_remove_memory(str
{
int result;
struct acpi_memory_info *info, *n;
+ int node;
+
+ node = acpi_get_node(mem_device->device->handle);
list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
if (!info->enabled)
@@ -319,6 +322,13 @@ static int acpi_memory_remove_memory(str
if (result)
return result;
+ if (node < 0)
+ node = memory_add_physaddr_to_nid(info->start_addr);
+
+ result = remove_memory(node, info->start_addr, info->length);
+ if (result)
+ return result;
+
list_del(&info->list);
kfree(info);
}
Index: linux-3.6/include/linux/memory_hotplug.h
===================================================================
--- linux-3.6.orig/include/linux/memory_hotplug.h 2012-10-03 19:03:10.963400796 +0900
+++ linux-3.6/include/linux/memory_hotplug.h 2012-10-03 19:03:26.820401968 +0900
@@ -222,6 +222,7 @@ static inline void unlock_memory_hotplug
#ifdef CONFIG_MEMORY_HOTREMOVE
extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
+extern int remove_memory(int nid, u64 start, u64 size);
#else
static inline int is_mem_section_removable(unsigned long pfn,
@@ -229,6 +230,10 @@ static inline int is_mem_section_removab
{
return 0;
}
+static inline int remove_memory(int nid, u64 start, u64 size)
+{
+ return -EBUSY;
+}
#endif /* CONFIG_MEMORY_HOTREMOVE */
extern int mem_online_node(int nid);
Index: linux-3.6/mm/memory_hotplug.c
===================================================================
--- linux-3.6.orig/mm/memory_hotplug.c 2012-10-03 19:03:10.962400795 +0900
+++ linux-3.6/mm/memory_hotplug.c 2012-10-03 19:04:15.493404911 +0900
@@ -1042,6 +1042,13 @@ int offline_memory(u64 start, u64 size)
return 0;
}
+
+int remove_memory(int nid, u64 start, u64 size)
+{
+ /* It is not implemented yet*/
+ return 0;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
#else
int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
--
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