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Subject[PATCH 3/3] userfaultfd: selftest: Report XFAIL if shmem doesn't support zeropage
Date
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

This is a real failure, but expected so signal that to the test harness:

# ./userfaultfd shmem 10 10
nr_pages: 160, nr_pages_per_cpu: 80
bounces: 9, mode: rnd poll, UFFDIO_ZEROPAGE unsupported in shmem VMAs
# echo $?
2

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
tools/testing/selftests/vm/userfaultfd.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index bc9ec38fbc34..686fe96f617f 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -1115,6 +1115,14 @@ static int userfaultfd_stress(void)
expected_ioctls = uffd_test_ops->expected_ioctls;
if ((uffdio_register.ioctls & expected_ioctls) !=
expected_ioctls) {
+ if (test_type == TEST_SHMEM &&
+ (uffdio_register.ioctls & expected_ioctls) ==
+ UFFD_API_RANGE_IOCTLS_BASIC) {
+ fprintf(stderr,
+ "UFFDIO_ZEROPAGE unsupported in shmem VMAs\n");
+ return KSFT_XFAIL;
+ }
+
fprintf(stderr,
"unexpected missing ioctl for anon memory\n");
return 1;
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