linux-kernel - Re: [PATCH 18/22] mm: mark DEVICE

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Date:   Fri, 14 Jun 2019 08:43:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Jason Gunthorpe <jgg@...lanox.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 18/22] mm: mark DEVICE_PUBLIC as broken

On Thu, Jun 13, 2019 at 05:43:15PM -0700, Ira Weiny wrote:
> <sigh>  yes but the earlier patch:
> 
> [PATCH 03/22] mm: remove hmm_devmem_add_resource
> 
> Removes the only place type is set to MEMORY_DEVICE_PUBLIC.
> 
> So I think it is ok.  Frankly I was wondering if we should remove the public
> type altogether but conceptually it seems ok.  But I don't see any users of it
> so...  should we get rid of it in the code rather than turning the config off?

That was my original idea.  But then again Jerome spent a lot of effort
putting hooks for it all over the mm and it would seem a little root
to just rip this out ASAP.  I'll give it some more time, but it it doesn't
get used after a few more kernel releases we should nuke it.