# Re: \[RFC v9 PATCH 03/21\] memory-hotplug: store the node id in acpi\_memory\_device

- From: Ni zhan Chen \<hidden\>
- Date: 2012-09-28 03:21:54 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2012/09/3930098
- Thread: https://ratatoskr.run/linux-mm/2012/09/3917853/t.md

```text
On 09/05/2012 05:25 PM, wency@cn.fujitsu.com wrote:
> From: Wen Congyang <redacted>
>
> The memory device has only one node id. Store the node id when
> enable the memory device, and we can reuse it when removing the
> memory device.

one question:
if use numa emulation, memory device will associated to one node or ...?

>
> 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>
> Reviewed-by: Yasuaki Ishimatsu <redacted>
> ---
>   drivers/acpi/acpi_memhotplug.c |    4 ++++
>   1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index 2a7beac..7873832 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -83,6 +83,7 @@ struct acpi_memory_info {
>   struct acpi_memory_device {
>   	struct acpi_device * device;
>   	unsigned int state;	/* State of the memory device */
> +	int nid;
>   	struct list_head res_list;
>   };
>   
> @@ -256,6 +257,9 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
>   		info->enabled = 1;
>   		num_enabled++;
>   	}
> +
> +	mem_device->nid = node;
> +
>   	if (!num_enabled) {
>   		printk(KERN_ERR PREFIX "add_memory failed\n");
>   		mem_device->state = MEMORY_INVALID_STATE;
```