linux-kernel - Re: [PATCH 1/1] mm: Export split

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Date:	Mon, 4 Mar 2013 10:07:47 +0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, andi@...stfloor.org,
	akpm@...ux-foundation.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/1] mm: Export split_page().

On Sun, Mar 03, 2013 at 06:27:55PM -0800, K. Y. Srinivasan wrote:
> The split_page() function will be very useful for balloon drivers. On Hyper-V,
> it will be very efficient to use 2M allocations in the guest as this (a) makes
> the ballooning protocol with the host that much more efficient and (b) moving
> memory in 2M chunks minimizes fragmentation in the host. Export the split_page()
> function to let the guest allocations be in 2M chunks while the host is free to
> return this memory at arbitrary granularity.
> 
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  mm/page_alloc.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 6cacfee..7e0ead6 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1404,6 +1404,7 @@ void split_page(struct page *page, unsigned int order)
>  	for (i = 1; i < (1 << order); i++)
>  		set_page_refcounted(page + i);
>  }
> +EXPORT_SYMBOL_GPL(split_page);

When you export a symbol, you also need to post the code that is going
to use that symbol, otherwise people don't really know how to judge this
request.

Can you just make this a part of your balloon driver update patch series
instead?

thanks,

greg k-h
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