diff --git a/lib/libzpool/include/sys/zfs_context.h b/lib/libzpool/include/sys/zfs_context.h
index ccd349ec0b..be2b46c3ce 100644
--- a/lib/libzpool/include/sys/zfs_context.h
+++ b/lib/libzpool/include/sys/zfs_context.h
@@ -149,9 +149,9 @@ extern void vpanic(const char *, __va_list);
 /*
  * Threads
  */
-
-/* XXX: not portable */
-#define	curthread	((void *)(uintptr_t)pthread_self())
+#define	curthread		((void *)(uintptr_t)pthread_self())
+#define	tsd_get(key)		pthread_getspecific(key)
+#define	tsd_set(key, val)	pthread_setspecific(key, val)
 
 typedef struct kthread kthread_t;
 typedef void (*thread_func_t)(void *);
diff --git a/module/zfs/rrwlock.c b/module/zfs/rrwlock.c
index 7bce5dd8d7..cff7adfe14 100644
--- a/module/zfs/rrwlock.c
+++ b/module/zfs/rrwlock.c
@@ -120,7 +120,7 @@ rrn_find_and_remove(rrwlock_t *rrl)
 	rrw_node_t *prev = NULL;
 
 	if (refcount_count(&rrl->rr_linked_rcount) == 0)
-		return (NULL);
+		return (B_FALSE);
 
 	for (rn = tsd_get(rrw_tsd_key); rn != NULL; rn = rn->rn_next) {
 		if (rn->rn_rrl == rrl) {