linux-kernel - Re: [PATCH V2] xen/balloon: Memory hotplug support for Xen balloon driver

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Date:	Tue, 03 May 2011 09:32:33 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Daniel Kiper <dkiper@...-space.pl>
Cc:	ian.campbell@...rix.com, akpm@...ux-foundation.org,
	andi.kleen@...el.com, haicheng.li@...ux.intel.com,
	fengguang.wu@...el.com, jeremy@...p.org, konrad.wilk@...cle.com,
	dan.magenheimer@...cle.com, v.tolstov@...fip.ru, pasik@....fi,
	wdauchy@...il.com, rientjes@...gle.com,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH V2] xen/balloon: Memory hotplug support for Xen balloon
 driver

On Tue, 2011-05-03 at 00:01 +0200, Daniel Kiper wrote:
> @@ -448,6 +575,14 @@ static int __init balloon_init(void)
>         balloon_stats.retry_count = 1;
>         balloon_stats.max_retry_count = RETRY_UNLIMITED;
> 
> +#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
> +       balloon_stats.hotplug_pages = 0;
> +       balloon_stats.balloon_hotplug = 0;
> +
> +       register_online_page_callback(&xen_online_page);
> +       register_memory_notifier(&xen_memory_nb);
> +#endif 

This is 100% static, apparently.  XEN_BALLOON can't be a module, so I
still don't see the point of having the un/register stuff.  

-- Dave


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