linux-kernel - Re: [RFC PATCH V6 04/19] memory-hotplug: offline and remove memory when removing the memory device

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Date:	Thu, 9 Aug 2012 17:41:04 +0200
From:	Vasilis Liaskovitis <vasilis.liaskovitis@...fitbricks.com>
To:	wency@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-ia64@...r.kernel.org, cmetcalf@...era.com,
	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, isimatu.yasuaki@...fujitsu.com
Subject: Re: [RFC PATCH V6 04/19] memory-hotplug: offline and remove memory
 when removing the memory device

Hi,

> We should offline and remove memory when removing the memory device.
> The memory device can be removed by 2 ways:
> 1. send eject request by SCI
> 2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject
>

[snip]

> +
> +static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
> +{
> +       int result;
> +
> +       /*
> +        * Ask the VM to offline this memory range.
> +        * Note: Assume that this function returns zero on success
> +        */
> +       result = acpi_memory_device_remove_memory(mem_device);
> +

here we should check the result of acpi_memory_device_remove_memory()
and not continue if it failed.

>         /* Power-off and eject the device */
>         result = acpi_memory_powerdown_device(mem_device);
>         if (result) {

thanks,

- Vasilis
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