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SubjectRe: [PATCH v5 00/25] userfaultfd: write protection support
On Wed, Jun 19, 2019 at 7:20 PM Peter Xu <> wrote:
> This series implements initial write protection support for
> userfaultfd. Currently both shmem and hugetlbfs are not supported
> yet, but only anonymous memory. This is the 4nd version of it.
> The latest code can also be found at:

Hi Peter - I ported the branch you had above on top of v5.4.20 (what I
happened to be running locally), and fixed one issue that was causing
crashes for me:

I wrote a small test program here:
and write protection support for userfaultfd (with eventual shmem
support) would be _hugely_ helpful for a userspace memory allocator
I'm working on.

Is there anything I can do to help get this considered for mainline?
We have some time before the 5.7 merge window opens up.

Tested-by: Bobby Powers <>

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