linux-kernel - Re: [PATCH 1/5] mm: return valid info from hmm_range

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Date:   Wed, 3 Jul 2019 22:28:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Christoph Hellwig <hch@....de>,
        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-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ralph Campbell <rcampbell@...dia.com>
Subject: Re: [PATCH 1/5] mm: return valid info from hmm_range_unregister

On Wed, Jul 03, 2019 at 07:00:50PM +0000, Jason Gunthorpe wrote:
> I don't think the API should be encouraging some shortcut here..
> 
> We can't do the above pattern because the old hmm_vma API didn't allow
> it, which is presumably a reason why it is obsolete.
> 
> I'd rather see drivers move to a consistent pattern so we can then
> easily hoist the seqcount lock scheme into some common mmu notifier
> code, as discussed.

So you don't like the version in amdgpu_ttm_tt_get_user_pages_done in
linux-next either?

I can remove this and just move hmm_vma_range_done to nouveau instead.
Let me know if you have other comments before I resend.  Note that
I'll probably be offline Thu-Sun this week.