linux-kernel - [PATCH v3 0/4] userfaultfd: selftest: Improve behavior with older kernels

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Date:   Tue, 28 Aug 2018 14:26:04 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     linux-kselftest@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Subject: [PATCH v3 0/4] userfaultfd: selftest: Improve behavior with older kernels

Hello,

This version of the series is unchanged from v2 except for the last patch
which is completely new, and is provided by Mike Rapoport.

Original series description:

> A tester ran the upstream selftest on a distro kernel and sounded the
> alarm when it reported failures for features which aren't included in
> that kernel.
> 
> This patch set improves the test behavior in that scenario.

Changes since v2:

- Added Mike Rapoport's Reviewed-by's and Acked-by's to patches 1-3. 
- Replaced patch 4/4 by the one provided by Mike Rapoport.

Changes since v1:

- Patch "userfaultfd: selftest: Skip test if userfaultfd() syscall
  not supported"
  - New patch, suggested by Mike Rapoport.

- Patch "userfaultfd: selftest: Skip test if a feature isn't supported"
  - Try running other tests even if one (or more) of them returns KSFT_SKIP.

- Patch "userfaultfd: selftest: Cope if shmem doesn't support zeropage"
  - Ignore lack of UFFDIO_ZEROPAGE in userfaultfd_events_test() and
    userfaultfd_stress().
  - Make userfaultfd_zeropage_test() return KSFT_SKIP if UFFDIO_ZEROPAGE
    isn't supported.

Mike Rapoport (1):
  userfaultfd: selftest: make supported range ioctl verification more
    robust

Thiago Jung Bauermann (3):
  userfaultfd: selftest: Fix checking of userfaultfd_open() result
  userfaultfd: selftest: Skip test if userfaultfd() syscall not
    supported
  userfaultfd: selftest: Skip test if a feature isn't supported

 tools/testing/selftests/vm/userfaultfd.c | 113 +++++++++++++++++++------------
 1 file changed, 69 insertions(+), 44 deletions(-)