linux-kernel - [PATCH 1/5] userfaultfd/selftests: Use user mode only

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Message-Id: <20210310004511.51996-2-peterx@redhat.com>
Date:   Tue,  9 Mar 2021 19:45:07 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, peterx@...hat.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: [PATCH 1/5] userfaultfd/selftests: Use user mode only

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@...hat.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