diff --git a/.topdeps b/.topdeps
new file mode 100644
index 0000000000..1f7391f92b
--- /dev/null
+++ b/.topdeps
@@ -0,0 +1 @@
+master
diff --git a/.topmsg b/.topmsg
new file mode 100644
index 0000000000..d1a9bb7a49
--- /dev/null
+++ b/.topmsg
@@ -0,0 +1,6 @@
+From: Brian Behlendorf <behlendorf1@llnl.gov>
+Subject: [PATCH] gcc invalid prototype
+
+Gcc -Wall warn: 'invalid prototype'
+
+Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
diff --git a/zfs/lib/libspl/include/sys/zfs_context.h b/zfs/lib/libspl/include/sys/zfs_context.h
index 0e7019bba8..f924dd1a64 100644
--- a/zfs/lib/libspl/include/sys/zfs_context.h
+++ b/zfs/lib/libspl/include/sys/zfs_context.h
@@ -195,7 +195,7 @@ typedef struct kthread kthread_t;
 	zk_thread_create(func, arg)
 #define	thread_exit() thr_exit(NULL)
 
-extern kthread_t *zk_thread_create(void (*func)(), void *arg);
+extern kthread_t *zk_thread_create(void (*func)(void), void *arg);
 
 #define	issig(why)	(FALSE)
 #define	ISSIG(thr, why)	(FALSE)
diff --git a/zfs/lib/libzfs/libzfs_mount.c b/zfs/lib/libzfs/libzfs_mount.c
index 7c5c7f3eca..bdc254566e 100644
--- a/zfs/lib/libzfs/libzfs_mount.c
+++ b/zfs/lib/libzfs/libzfs_mount.c
@@ -93,7 +93,7 @@ zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
 static int (*iscsitgt_zfs_share)(const char *);
 static int (*iscsitgt_zfs_unshare)(const char *);
 static int (*iscsitgt_zfs_is_shared)(const char *);
-static int (*iscsitgt_svc_online)();
+static int (*iscsitgt_svc_online)(void);
 
 /*
  * The share protocols table must be in the same order as the zfs_share_prot_t
@@ -140,7 +140,7 @@ zfs_iscsi_init(void)
 	    "iscsitgt_zfs_unshare")) == NULL ||
 	    (iscsitgt_zfs_is_shared = (int (*)(const char *))dlsym(libiscsitgt,
 	    "iscsitgt_zfs_is_shared")) == NULL ||
-	    (iscsitgt_svc_online = (int (*)(const char *))dlsym(libiscsitgt,
+	    (iscsitgt_svc_online = (int (*)(void))dlsym(libiscsitgt,
 	    "iscsitgt_svc_online")) == NULL) {
 		iscsitgt_zfs_share = NULL;
 		iscsitgt_zfs_unshare = NULL;
diff --git a/zfs/lib/libzpool/include/sys/spa.h b/zfs/lib/libzpool/include/sys/spa.h
index 24b3ca4476..1029b38294 100644
--- a/zfs/lib/libzpool/include/sys/spa.h
+++ b/zfs/lib/libzpool/include/sys/spa.h
@@ -522,7 +522,7 @@ extern void vdev_cache_stat_fini(void);
 /* Initialization and termination */
 extern void spa_init(int flags);
 extern void spa_fini(void);
-extern void spa_boot_init();
+extern void spa_boot_init(void);
 
 /* properties */
 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
diff --git a/zfs/lib/libzpool/include/sys/zfs_znode.h b/zfs/lib/libzpool/include/sys/zfs_znode.h
index a5416525c7..db40968fa2 100644
--- a/zfs/lib/libzpool/include/sys/zfs_znode.h
+++ b/zfs/lib/libzpool/include/sys/zfs_znode.h
@@ -305,8 +305,8 @@ extern int	zfs_rezget(znode_t *);
 extern void	zfs_zinactive(znode_t *);
 extern void	zfs_znode_delete(znode_t *, dmu_tx_t *);
 extern void	zfs_znode_free(znode_t *);
-extern void	zfs_remove_op_tables();
-extern int	zfs_create_op_tables();
+extern void	zfs_remove_op_tables(void);
+extern int	zfs_create_op_tables(void);
 extern int	zfs_sync(vfs_t *vfsp, short flag, cred_t *cr);
 extern dev_t	zfs_cmpldev(uint64_t);
 extern int	zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value);
diff --git a/zfs/lib/libzpool/spa_history.c b/zfs/lib/libzpool/spa_history.c
index c997240c14..8b422cf8b9 100644
--- a/zfs/lib/libzpool/spa_history.c
+++ b/zfs/lib/libzpool/spa_history.c
@@ -176,7 +176,7 @@ spa_history_write(spa_t *spa, void *buf, uint64_t len, spa_history_phys_t *shpp,
 }
 
 static char *
-spa_history_zone()
+spa_history_zone(void)
 {
 #ifdef _KERNEL
 	return (curproc->p_zone->zone_name);
diff --git a/zfs/lib/libzpool/spa_misc.c b/zfs/lib/libzpool/spa_misc.c
index 36046e6df1..e188b2da16 100644
--- a/zfs/lib/libzpool/spa_misc.c
+++ b/zfs/lib/libzpool/spa_misc.c
@@ -1329,7 +1329,7 @@ spa_busy(void)
 }
 
 void
-spa_boot_init()
+spa_boot_init(void)
 {
 	spa_config_load();
 }