diff --git a/.topdeps b/.topdeps
index 607c231780..7f16cbcdd5 100644
--- a/.topdeps
+++ b/.topdeps
@@ -1,3 +1 @@
-gcc-branch
-fix-branch
-feature-branch
+zfs-branch
diff --git a/.topmsg b/.topmsg
index 03967cdff5..12a0279afc 100644
--- a/.topmsg
+++ b/.topmsg
@@ -1,19 +1,6 @@
 From: Brian Behlendorf <behlendorf1@llnl.gov>
-Subject: [PATCH] zfs branch
+Subject: [PATCH] linux have spl debug
 
-Merged result of all changes which are relevant to both Solaris
-and Linux builds of the ZFS code.  These are changes where there
-is a reasonable chance they will be accepted upstream.
-
-Additionally, since this is effectively the root of the linux
-ZFS tree the core linux build system is added here.  This
-includes autogen.sh, configure.ac, m4 macros, some scripts/*,
-and makefiles for all the core ZFS components.  Linux-only
-features which require tweaks to the build system should appear
-on the relevant topic branches.  All autotools products which
-result from autogen.sh are commited to the linux-configure-branch.
-
-This branch also contains the META, ChangeLog, AUTHORS, TODO,
-and README, files.
+Use spl debug if HAVE_SPL defined
 
 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
diff --git a/module/zfs/include/sys/zfs_debug.h b/module/zfs/include/sys/zfs_debug.h
index 02d9da1317..a8f0f186f4 100644
--- a/module/zfs/include/sys/zfs_debug.h
+++ b/module/zfs/include/sys/zfs_debug.h
@@ -57,11 +57,16 @@ extern int zfs_flags;
 #define	ZFS_DEBUG_MODIFY	0x0010
 
 #ifdef ZFS_DEBUG
+#if defined(_KERNEL) && defined(HAVE_SPL)
+#include <sys/debug.h>
+#define dprintf(...) CDEBUG_LIMIT(D_DPRINTF, __VA_ARGS__)
+#else
 extern void __dprintf(const char *file, const char *func,
     int line, const char *fmt, ...);
 #define	dprintf(...) \
 	if (zfs_flags & ZFS_DEBUG_DPRINTF) \
 		__dprintf(__FILE__, __func__, __LINE__, __VA_ARGS__)
+#endif /* _KERNEL && HAVE_SPL */
 #else
 #define	dprintf(...) ((void)0)
 #endif /* ZFS_DEBUG */
diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c
index 592adbd7da..345a4deadc 100644
--- a/module/zfs/spa_misc.c
+++ b/module/zfs/spa_misc.c
@@ -233,8 +233,13 @@ kmem_cache_t *spa_buffer_pool;
 int spa_mode_global;
 
 #ifdef ZFS_DEBUG
+#if defined(_KERNEL) && defined(HAVE_SPL)
+/* All filtering done by the SPL */
+int zfs_flags = ~0;
+#else
 /* Everything except dprintf is on by default in debug builds */
 int zfs_flags = ~ZFS_DEBUG_DPRINTF;
+#endif
 #else
 int zfs_flags = 0;
 #endif