linux-kernel - Re: [PATCH] mm: Export symbols unmapped_area() & unmapped_area

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Message-ID: <1458162041.14723.32.camel@redhat.com>
Date:	Wed, 16 Mar 2016 17:00:41 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>,
	Olu Ogunbowale <Olu.Ogunbowale@...tec.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] mm: Export symbols unmapped_area() &
 unmapped_area_topdown()

On Wed, 2016-03-16 at 13:36 -0700, Christoph Hellwig wrote:
> On Wed, Mar 16, 2016 at 05:10:34PM +0000, Olu Ogunbowale wrote:
> > 
> > From: Olujide Ogunbowale <Olu.Ogunbowale@...tec.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?

The drivers appear to require the HMM framework though,
which people are also reluctant to merge without the
drivers.

How do we get past this chicken & egg situation?

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