Re: [PATCH v2 4/4] userfaultfd: selftest: Cope if shmem doesn't support zeropage
From: Mike Rapoport
Date: Tue Aug 28 2018 - 02:15:35 EST
On Mon, Aug 27, 2018 at 11:46:33PM -0300, Thiago Jung Bauermann wrote:
> Hello Mike,
> Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> writes:
> > Hi,
> > On Fri, Aug 03, 2018 at 07:00:46PM -0300, Thiago Jung Bauermann wrote:
> >> If userfaultfd runs on a system that doesn't support UFFDIO_ZEROPAGE for
> >> shared memory, it currently ends with error code 1 which indicates test
> >> failure:
> >> # ./userfaultfd shmem 10 10
> >> nr_pages: 160, nr_pages_per_cpu: 80
> >> bounces: 9, mode: rnd poll, unexpected missing ioctl for anon memory
> >> # echo $?
> >> 1
> >> Change userfaultfd_zeropage_test() to return KSFT_SKIP to indicate that
> >> the test is being skipped.
> > I took a deeper look at what userfaultfd_zeropage_test() does and,
> > apparently, I've mislead you. The test checks if the range has
> > UFFDIO_ZEROPAGE and verifies that it works if yes; otherwise the test
> > verifies that EINVAL is returned.
> > Can you please check if the patch below works in your environment?
> > From 7a34c84c0461b5073742275638c44b6535d19166 Mon Sep 17 00:00:00 2001
> > From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
> > Date: Tue, 7 Aug 2018 09:44:19 +0300
> > Subject: [PATCH] userfaultfd: selftest: make supported range ioctl
> > verification more robust
> > When userfaultfd tests runs on older kernel that does not support
> > UFFDIO_ZEROPAGE for shared memory it fails at the ioctl verification.
> > Split out the verification that supported ioctls are superset of the
> > expected ioctls and relax the checks for UFFDIO_ZEROPAGE for shared memory
> > areas.
> > Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
> > ---
> > tools/testing/selftests/vm/userfaultfd.c | 63 +++++++++++++++++---------------
> > 1 file changed, 34 insertions(+), 29 deletions(-)
> I'm sorry to take this long to respond, I was only able to get back to
> this today.
No problem :)
> Your patch does solve my problem. Thank you very much!
> It has a trivial conflict in the second hunk with patch 3 in my series.
> Should I repost the series with your patch in place of patch 4?
> Thiago Jung Bauermann
> IBM Linux Technology Center