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selftests/mm: skip guard_regions.uffd tests when uffd is not present

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Patch series "Skip mm selftests instead when kernel features are not
present", v2.

Two guard_regions tests on userfaultfd fail when userfaultfd is not
present.  Skip them instead.

hugevm test reads kernel config to get page table level information and
fails when neither /proc/config.gz nor /boot/config-* is present.  Skip it
instead.


This patch (of 2):

When userfaultfd is not compiled into kernel, userfaultfd() returns -1,
causing guard_regions.uffd tests to fail.  Skip the tests instead.

Link: https://lkml.kernel.org/r/20250516132938.356627-1-ziy@nvidia.com
Link: https://lkml.kernel.org/r/20250516132938.356627-2-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Cc: Adam Sindelar <adam@wowsignal.io>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2025-05-16 09:29:37 -04:00 committed by Andrew Morton
parent c5a9deace6
commit 6d21130312
1 changed files with 15 additions and 2 deletions
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17
tools/testing/selftests/mm/guard-regions.c
View File

@ -1453,8 +1453,21 @@ TEST_F(guard_regions, uffd)
/* Set up uffd. */
uffd = userfaultfd(0);
if (uffd == -1 && errno == EPERM)
ksft_exit_skip("No userfaultfd permissions, try running as root.\n");
if (uffd == -1) {
switch (errno) {
case EPERM:
SKIP(return, "No userfaultfd permissions, try running as root.");
break;
case ENOSYS:
SKIP(return, "userfaultfd is not supported/not enabled.");
break;
default:
ksft_exit_fail_msg("userfaultfd failed with %s\n",
strerror(errno));
break;
}
}
ASSERT_NE(uffd, -1);
ASSERT_EQ(ioctl(uffd, UFFDIO_API, &api), 0);