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Date:	Wed, 05 Sep 2012 09:41:06 +0800
From:	Wen Congyang <>
To:	Andrew Morton <>
	Christoph Lameter <>
Subject: Re: [RFC v8 PATCH 08/20] memory-hotplug: remove /sys/firmware/memmap/X

At 09/05/2012 07:16 AM, Andrew Morton Wrote:
> On Mon, 03 Sep 2012 13:51:10 +0800
> Wen Congyang <> wrote:
>>>> +static void release_firmware_map_entry(struct kobject *kobj)
>>>> +{
>>>> +	struct firmware_map_entry *entry = to_memmap_entry(kobj);
>>>> +	struct page *page;
>>>> +
>>>> +	page = virt_to_page(entry);
>>>> +	if (PageSlab(page) || PageCompound(page))
>>> That PageCompound() test looks rather odd.  Why is this done?
>> Liu Jiang and Christoph Lameter discussed how to find slab page
>> in this mail:
> Well, please add a code comment to release_firmware_map_entry() which
> fully explains these things.
> I see that Christoph and I agree: "It would be cleaner if memory
> hotplug had an indicator which allocation mechanism was used and would
> use the corresponding free action".  You didn't respond to this
> suggestion when he made it, nor when I made it.  What are your thoughts
> on this?

Hmm, I think it is better to use an indicator which allocation mechanism was
used. I will do it in the next version.

Wen Congyang
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