1 files changed, 6 insertions, 2 deletions
diff --git a/lib/libthr/thread/thr_rwlock.c b/lib/libthr/thread/thr_rwlock.c
index aadd0e9..748eb52 100644
--- a/lib/libthr/thread/thr_rwlock.c
+++ b/lib/libthr/thread/thr_rwlock.c
@@ -22,10 +22,11 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- *
- * $FreeBSD$
  */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
@@ -35,6 +36,9 @@
 #include "un-namespace.h"
 #include "thr_private.h"
 
+_Static_assert(sizeof(struct pthread_rwlock) <= PAGE_SIZE,
+    "pthread_rwlock is too large for off-page");
+
 __weak_reference(_pthread_rwlock_destroy, pthread_rwlock_destroy);
 __weak_reference(_pthread_rwlock_init, pthread_rwlock_init);
 __weak_reference(_pthread_rwlock_rdlock, pthread_rwlock_rdlock);