diff --git a/lib/netdev.c b/lib/netdev.c
index 20f38be..12d3ab4 100644
--- a/lib/netdev.c
+++ b/lib/netdev.c
@@ -851,7 +851,7 @@ netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
 {
     ssize_t n_bytes;
     struct sockaddr_ll sll;
-    int sll_len;
+    socklen_t sll_len;
 
     assert(buffer->size == 0);
     assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
diff --git a/lib/ofp-print.c b/lib/ofp-print.c
index 04c65e1..dc0e2aa 100644
--- a/lib/ofp-print.c
+++ b/lib/ofp-print.c
@@ -1309,7 +1309,7 @@ ofp_echo(struct ds *string, const void *oh, size_t len, int verbosity)
 }
 
 static void
-ofp_vendor(struct ds *string, const void *oh, size_t len, int verbosity)
+ofp_vendor(struct ds *string UNUSED, const void *oh, size_t len UNUSED, int verbosity UNUSED)
 {
     const struct ofp_vendor_header *vh = oh;
 
@@ -1344,7 +1344,7 @@ show_queue_props(struct ds *string, const struct ofp_packet_queue *queue_desc)
 
 static void
 show_queue_get_config_reply(struct ds *string, const void *oh,
-                            size_t len, int verbosity)
+                            size_t len UNUSED, int verbosity UNUSED)
 {
     const struct ofp_queue_get_config_reply *reply;
     const struct ofp_packet_queue *queue_desc;
diff --git a/udatapath/dp_act.c b/udatapath/dp_act.c
index 28e9590..d48beb1 100644
--- a/udatapath/dp_act.c
+++ b/udatapath/dp_act.c
@@ -57,7 +57,7 @@ validate_output(struct datapath *dp UNUSED, const struct sw_flow_key *key,
 }
 
 static uint16_t
-validate_queue(struct datapath *dp UNUSED, const struct sw_flow_key *key,
+validate_queue(struct datapath *dp UNUSED, const struct sw_flow_key *key UNUSED,
                const struct ofp_action_header *ah)
 {
     struct ofp_action_enqueue *ea = (struct ofp_action_enqueue *)ah;
@@ -372,7 +372,7 @@ validate_ofpat(struct datapath *dp, const struct sw_flow_key *key,
 /* Validate vendor-defined actions.  Either returns ACT_VALIDATION_OK
  * or an OFPET_BAD_ACTION error code. */
 static uint16_t 
-validate_vendor(struct datapath *dp, const struct sw_flow_key *key, 
+validate_vendor(struct datapath *dp UNUSED, const struct sw_flow_key *key UNUSED, 
         const struct ofp_action_header *ah, uint16_t len)
 {
     struct ofp_action_vendor_header *avh;
@@ -454,7 +454,7 @@ execute_ofpat(struct ofpbuf *buffer, struct sw_flow_key *key,
 
 /* Execute a vendor-defined action against 'buffer'. */
 static void
-execute_vendor(struct ofpbuf *buffer, const struct sw_flow_key *key, 
+execute_vendor(struct ofpbuf *buffer UNUSED, const struct sw_flow_key *key UNUSED, 
         const struct ofp_action_header *ah)
 {
     struct ofp_action_vendor_header *avh