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Date:   Thu, 23 Feb 2017 17:56:23 +0300
From:   "Kirill A. Shutemov" <>
To:     Andrea Arcangeli <>
Cc:     Mike Kravetz <>,,,
        Andrew Morton <>,
        Mike Rapoport <>,
        "Dr. David Alan Gilbert" <>,
        Hillf Danton <>,
        Pavel Emelyanov <>
Subject: Re: [PATCH] userfaultfd: hugetlbfs: add UFFDIO_COPY support for
 shared mappings

On Wed, Feb 22, 2017 at 04:15:07PM +0100, Andrea Arcangeli wrote:
> On Tue, Feb 21, 2017 at 04:25:45PM +0300, Kirill A. Shutemov wrote:
> > I think more strict vma_is_anonymous() is a good thing.
> > 
> > But I don't see a point introducing one more helper. Let's just make the
> > existing helper work better.
> That would be simpler agreed. The point of having an "unsafe" faster
> version was only for code running in page fault context where the
> additional check is unnecessary.

Well, I don't think that the cost of additional check is significant here.
And we can bring ->vm_ops a bit closer to ->vm_flags to avoid potential
cache miss.

 Kirill A. Shutemov

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