linux-kernel - Re: [Nouveau] [PATCH 22/22] mm: don't select MIGRATE_VMA_HELPER from HMM

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Date:   Fri, 14 Jun 2019 08:48:23 +0200
From:   Christoph Hellwig <hch@....de>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>, linux-nvdimm@...ts.01.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-mm@...ck.org,
        nouveau@...ts.freedesktop.org
Subject: Re: [Nouveau] [PATCH 22/22] mm: don't select MIGRATE_VMA_HELPER
 from HMM_MIRROR

On Thu, Jun 13, 2019 at 06:53:15PM -0700, John Hubbard wrote:
> For those who have out of tree drivers that need migrate_vma(), but are not
> Nouveau, could we pretty please allow a way to select that independently?

No.  The whole point is to not build this fairly big chunk of code in
unless we have a user in the tree.