From: Peter Xu <peterx@redhat.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Andrea Arcangeli <aarcange@redhat.com>,
peterx@redhat.com, Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Axel Rasmussen <axelrasmussen@google.com>
Subject: [PATCH v2 1/5] userfaultfd/selftests: Use user mode only
Date: Mon, 12 Apr 2021 19:27:49 -0400 [thread overview]
Message-ID: <20210412232753.1012412-2-peterx@redhat.com> (raw)
In-Reply-To: <20210412232753.1012412-1-peterx@redhat.com>
Userfaultfd selftest does not need to handle kernel initiated fault. Set user
mode so it can be run even if unprivileged_userfaultfd=0 (which is the default).
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
tools/testing/selftests/vm/userfaultfd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index f5ab5e0312e7..ce23db8eec26 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -831,7 +831,7 @@ static int userfaultfd_open_ext(uint64_t *features)
{
struct uffdio_api uffdio_api;
- uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
+ uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);
if (uffd < 0) {
fprintf(stderr,
"userfaultfd syscall not available in this kernel\n");
--
2.26.2
next prev parent reply other threads:[~2021-04-12 23:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 23:27 [PATCH v2 0/5] userfaultfd/selftests: A few cleanups Peter Xu
2021-04-12 23:27 ` Peter Xu [this message]
2021-04-12 23:27 ` [PATCH v2 2/5] userfaultfd/selftests: Remove the time() check on delayed uffd Peter Xu
2021-04-12 23:27 ` [PATCH v2 3/5] userfaultfd/selftests: Dropping VERIFY check in locking_thread Peter Xu
2021-04-12 23:27 ` [PATCH v2 4/5] userfaultfd/selftests: Only dump counts if mode enabled Peter Xu
2021-04-12 23:27 ` [PATCH v2 5/5] userfaultfd/selftests: Unify error handling Peter Xu
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