diff --git a/.topdeps b/.topdeps
index 736703fbec..a8059c3552 100644
--- a/.topdeps
+++ b/.topdeps
@@ -1 +1 @@
-linux-kernel-module
+linux-debug-zerocopy
diff --git a/.topmsg b/.topmsg
index 63a8108fc5..39952c5d9c 100644
--- a/.topmsg
+++ b/.topmsg
@@ -1,6 +1,6 @@
 From: Brian Behlendorf <behlendorf1@llnl.gov>
-Subject: [PATCH] linux debug zerocopy
+Subject: [PATCH] linux have uio rw
 
-Add debug ONLY option for zerocopy
+Use uio-rw if HAVE_UIO_RW defined
 
 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
diff --git a/zfs/lib/libzpool/dmu.c b/zfs/lib/libzpool/dmu.c
index 3d6a99c57a..1033540c53 100644
--- a/zfs/lib/libzpool/dmu.c
+++ b/zfs/lib/libzpool/dmu.c
@@ -675,7 +675,7 @@ dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	dmu_write_impl(os, object, offset, size, buf, tx, 0);
 }
 
-#ifdef _KERNEL
+#if defined(_KERNEL) && defined(HAVE_UIO_RW)
 int
 dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
 {
diff --git a/zfs/lib/libzpool/include/sys/dmu.h b/zfs/lib/libzpool/include/sys/dmu.h
index fa2f8eff57..15da305d78 100644
--- a/zfs/lib/libzpool/include/sys/dmu.h
+++ b/zfs/lib/libzpool/include/sys/dmu.h
@@ -484,11 +484,13 @@ void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	const void *buf, dmu_tx_t *tx);
 void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	dmu_tx_t *tx);
+#if defined(_KERNEL) && defined(HAVE_UIO_RW)
 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size);
 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size,
     dmu_tx_t *tx);
 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset,
     uint64_t size, struct page *pp, dmu_tx_t *tx);
+#endif
 
 extern int zfs_prefetch_disable;