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Date: Thu, 1 Mar 2012 14:33:45 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: linux-mm@kvack.org, mgorman@suse.de, kamezawa.hiroyu@jp.fujitsu.com,
        dhillf@gmail.com, aarcange@redhat.com, mhocko@suse.cz,
        hannes@cmpxchg.org, linux-kernel@vger.kernel.org,
        cgroups@vger.kernel.org, Andrea Righi <andrea@betterlinux.com>,
        John Stultz <john.stultz@linaro.org>
Subject: Re: [PATCH -V2 1/9] mm:  move hugetlbfs region tracking function to
 common code
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On Thu,  1 Mar 2012 14:46:12 +0530
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> wrote:

> This patch moves the hugetlbfs region tracking function to
> common code. We will be using this in later patches in the
> series.
> 
> ...
>
> +struct file_region {
> +	struct list_head link;
> +	long from;
> +	long to;
> +};

Both Andrea Righi and John Stultz are working on (more sophisticated)
versions of file region tracking code.  And we already have a (poor)
implementation in fs/locks.c.

That's four versions of the same thing floating around the place.  This
is nutty.