[PATCH v3 6/8] selftests/landlock: Replace hard-coded 16 with a constant

[Tingmao Wang]

The next commit will reuse this number.  Make it a shared constant to
future-proof changes.

Signed-off-by: Tingmao Wang <m at maowtm.org>
---

Changes since v2:
- New patch

 tools/testing/selftests/landlock/audit_test.c | 2 +-
 tools/testing/selftests/landlock/common.h     | 2 ++
 tools/testing/selftests/landlock/fs_test.c    | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/landlock/audit_test.c b/tools/testing/selftests/landlock/audit_test.c
index 46d02d49835a..4417cdedeadd 100644
--- a/tools/testing/selftests/landlock/audit_test.c
+++ b/tools/testing/selftests/landlock/audit_test.c
@@ -76,7 +76,7 @@ TEST_F(audit, layers)
 		.scoped = LANDLOCK_SCOPE_SIGNAL,
 	};
 	int status, ruleset_fd, i;
-	__u64(*domain_stack)[16];
+	__u64(*domain_stack)[LANDLOCK_MAX_NUM_LAYERS];
 	__u64 prev_dom = 3;
 	pid_t child;
 
diff --git a/tools/testing/selftests/landlock/common.h b/tools/testing/selftests/landlock/common.h
index 230b75f6015b..719326f9e8f0 100644
--- a/tools/testing/selftests/landlock/common.h
+++ b/tools/testing/selftests/landlock/common.h
@@ -25,6 +25,8 @@
 /* TEST_F_FORK() should not be used for new tests. */
 #define TEST_F_FORK(fixture_name, test_name) TEST_F(fixture_name, test_name)
 
+#define LANDLOCK_MAX_NUM_LAYERS 16
+
 static const char bin_sandbox_and_launch[] = "./sandbox-and-launch";
 static const char bin_wait_pipe[] = "./wait-pipe";
 static const char bin_wait_pipe_sandbox[] = "./wait-pipe-sandbox";
diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index 21dd95aaf5e4..943b6e2ac53d 100644
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -1497,7 +1497,7 @@ TEST_F_FORK(layout0, max_layers)
 	const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules);
 
 	ASSERT_LE(0, ruleset_fd);
-	for (i = 0; i < 16; i++)
+	for (i = 0; i < LANDLOCK_MAX_NUM_LAYERS; i++)
 		enforce_ruleset(_metadata, ruleset_fd);
 
 	for (i = 0; i < 2; i++) {
-- 
2.51.1