From: Peter Xu <peterx@redhat.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Axel Rasmussen <axelrasmussen@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
peterx@redhat.com, Andrea Arcangeli <aarcange@redhat.com>,
Nadav Amit <nadav.amit@gmail.com>
Subject: [PATCH 1/5] userfaultfd/selftests: Use user mode only
Date: Tue, 9 Mar 2021 19:45:07 -0500 [thread overview]
Message-ID: <20210310004511.51996-2-peterx@redhat.com> (raw)
In-Reply-To: <20210310004511.51996-1-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).
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 f31e9a4edc55..6dab8ef034a0 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -381,7 +381,7 @@ static int userfaultfd_open(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:[~2021-03-10 0:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 0:45 [PATCH 0/5] userfaultfd/selftests: A few cleanups Peter Xu
2021-03-10 0:45 ` Peter Xu [this message]
2021-03-10 0:45 ` [PATCH 2/5] userfaultfd/selftests: Remove the time() check on delayed uffd Peter Xu
2021-03-10 0:45 ` [PATCH 3/5] userfaultfd/selftests: Dropping VERIFY check in locking_thread Peter Xu
2021-03-10 0:45 ` [PATCH 4/5] userfaultfd/selftests: Only dump counts if mode enabled Peter Xu
2021-03-10 0:45 ` [PATCH 5/5] userfaultfd/selftests: Unify error handling Peter Xu
2021-03-10 21:26 ` [PATCH 0/5] userfaultfd/selftests: A few cleanups Axel Rasmussen
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