linux-kernel - Re: [PATCH 21/22] mm: remove the HMM config option

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Date:   Fri, 14 Jun 2019 08:47:16 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Christoph Hellwig <hch@....de>,
        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 21/22] mm: remove the HMM config option

On Thu, Jun 13, 2019 at 08:01:55PM +0000, Jason Gunthorpe wrote:
> On Thu, Jun 13, 2019 at 11:43:24AM +0200, Christoph Hellwig wrote:
> > All the mm/hmm.c code is better keyed off HMM_MIRROR.  Also let nouveau
> > depend on it instead of the mix of a dummy dependency symbol plus the
> > actually selected one.  Drop various odd dependencies, as the code is
> > pretty portable.
> 
> I don't really know, but I thought this needed the arch restriction
> for the same reason get_user_pages has various unique arch specific
> implementations (it does seem to have some open coded GUP like thing)?
> 
> I was hoping we could do this after your common gup series? But sooner
> is better too.

Ok, I've added the arch and 64-bit dependency back in for now.  It does
not look proper to me, and is certainly underdocumented, but the whole
pagetable walking code will need a lot of love eventually anyway, and
the Kconfig stuff for it can be done properly then.