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

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Date:   Thu, 13 Jun 2019 20:04:03 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Christoph Hellwig <hch@....de>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 22/22] mm: don't select MIGRATE_VMA_HELPER from HMM_MIRROR

On Thu, Jun 13, 2019 at 11:43:25AM +0200, Christoph Hellwig wrote:
> The migrate_vma helper is only used by noveau to migrate device private
> pages around.  Other HMM_MIRROR users like amdgpu or infiniband don't
> need it.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/gpu/drm/nouveau/Kconfig | 1 +
>  mm/Kconfig                      | 1 -
>  2 files changed, 1 insertion(+), 1 deletion(-)

Yes, the thing that calls migrate_vma() should be the thing that has
the kconfig stuff.

Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>

Jason