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Date: Wed, 16 Mar 2016 13:36:57 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Olu Ogunbowale <Olu.Ogunbowale@imgtec.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] mm: Export symbols unmapped_area() &
 unmapped_area_topdown()
Message-ID: <20160316203657.GA29061@infradead.org>
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On Wed, Mar 16, 2016 at 05:10:34PM +0000, Olu Ogunbowale wrote:
> From: Olujide Ogunbowale <Olu.Ogunbowale@imgtec.com>
> 
> Export the memory management functions, unmapped_area() &
> unmapped_area_topdown(), as GPL symbols; this allows the kernel to
> better support process address space mirroring on both CPU and device
> for out-of-tree drivers by allowing the use of vm_unmapped_area() in a
> driver's file operation get_unmapped_area().

No new exports without in-tree drivers.  How about you get started
to get your drives into the tree first?