linux-kernel - Re: [RFC PATCH 1/8] memory-hotplug: store the node id in acpi_memory

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Date:	Fri, 20 Jul 2012 16:35:43 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>,
	<rientjes@...gle.com>, <liuj97@...il.com>, <len.brown@...el.com>,
	<benh@...nel.crashing.org>, <paulus@...ba.org>, <cl@...ux.com>,
	<minchan.kim@...il.com>, <akpm@...ux-foundation.org>,
	<kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC PATCH 1/8] memory-hotplug: store the node id in acpi_memory_device

Hi Wen,

2012/07/20 16:09, Wen Congyang wrote:
> The memory device has only one node id. Store the node id when
> enabling the memory device, and we can reuse it when removing the
> memory device.
>
> CC: David Rientjes <rientjes@...gle.com>
> CC: Jiang Liu <liuj97@...il.com>
> CC: Len Brown <len.brown@...el.com>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Paul Mackerras <paulus@...ba.org>
> CC: Christoph Lameter <cl@...ux.com>
> Cc: Minchan Kim <minchan.kim@...il.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
> ---

It looks to me.
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

Thanks,
Yasuaki Ishimatsu

>   drivers/acpi/acpi_memhotplug.c |    8 +++++---
>   1 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index 5cafd6b..db8de39 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -84,6 +84,7 @@ 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;
>   };
>
> @@ -257,6 +258,9 @@ 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;
> @@ -463,7 +467,7 @@ static int acpi_memory_device_remove(struct acpi_device *device, int type)
>
>   	mem_device = acpi_driver_data(device);
>
> -	node = acpi_get_node(mem_device->device->handle);
> +	node = mem_device->nid;
>   	list_for_each_entry_safe(info, tmp, &mem_device->res_list, list) {
>   		if (!info->enabled)
>   			continue;
> @@ -473,8 +477,6 @@ static int acpi_memory_device_remove(struct acpi_device *device, int type)
>   			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)
>


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