diff --git a/http-push.c b/http-push.c
index 88aa045ecb..2d01b430e7 100644
--- a/http-push.c
+++ b/http-push.c
@@ -602,7 +602,7 @@ static void finish_request(struct transfer_request *request)
 }
 
 static int is_running_queue;
-static int fill_active_slot(void *unused)
+static int fill_active_slot(void *data UNUSED)
 {
 	struct transfer_request *request;
 
diff --git a/http-walker.c b/http-walker.c
index c3e902c40e..93a4a98a3d 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -53,8 +53,7 @@ static void fetch_alternates(struct walker *walker, const char *base);
 
 static void process_object_response(void *callback_data);
 
-static void start_object_request(struct walker *walker,
-				 struct object_request *obj_req)
+static void start_object_request(struct object_request *obj_req)
 {
 	struct active_request_slot *slot;
 	struct http_object_request *req;
@@ -111,7 +110,7 @@ static void process_object_response(void *callback_data)
 			obj_req->repo =
 				obj_req->repo->next;
 			release_http_object_request(obj_req->req);
-			start_object_request(walker, obj_req);
+			start_object_request(obj_req);
 			return;
 		}
 	}
@@ -128,7 +127,7 @@ static void release_object_request(struct object_request *obj_req)
 	free(obj_req);
 }
 
-static int fill_active_slot(struct walker *walker)
+static int fill_active_slot(void *data UNUSED)
 {
 	struct object_request *obj_req;
 	struct list_head *pos, *tmp, *head = &object_queue_head;
@@ -139,7 +138,7 @@ static int fill_active_slot(struct walker *walker)
 			if (has_object_file(&obj_req->oid))
 				obj_req->state = COMPLETE;
 			else {
-				start_object_request(walker, obj_req);
+				start_object_request(obj_req);
 				return 1;
 			}
 		}
@@ -614,7 +613,7 @@ struct walker *get_http_walker(const char *url)
 	walker->cleanup = cleanup;
 	walker->data = data;
 
-	add_fill_function(walker, (int (*)(void *)) fill_active_slot);
+	add_fill_function(NULL, fill_active_slot);
 
 	return walker;
 }
diff --git a/mailmap.c b/mailmap.c
index da2589b082..22e90129ea 100644
--- a/mailmap.c
+++ b/mailmap.c
@@ -3,16 +3,6 @@
 #include "mailmap.h"
 #include "object-store.h"
 
-#define DEBUG_MAILMAP 0
-#if DEBUG_MAILMAP
-#define debug_mm(...) fprintf(stderr, __VA_ARGS__)
-#define debug_str(X) ((X) ? (X) : "(none)")
-#else
-__attribute__((format (printf, 1, 2)))
-static inline void debug_mm(const char *format, ...) {}
-static inline const char *debug_str(const char *s) { return s; }
-#endif
-
 const char *git_mailmap_file;
 const char *git_mailmap_blob;
 
@@ -30,23 +20,17 @@ struct mailmap_entry {
 	struct string_list namemap;
 };
 
-static void free_mailmap_info(void *p, const char *s)
+static void free_mailmap_info(void *p, const char *s UNUSED)
 {
 	struct mailmap_info *mi = (struct mailmap_info *)p;
-	debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n",
-		 s, debug_str(mi->name), debug_str(mi->email));
 	free(mi->name);
 	free(mi->email);
 	free(mi);
 }
 
-static void free_mailmap_entry(void *p, const char *s)
+static void free_mailmap_entry(void *p, const char *s UNUSED)
 {
 	struct mailmap_entry *me = (struct mailmap_entry *)p;
-	debug_mm("mailmap: removing entries for <%s>, with %"PRIuMAX" sub-entries\n",
-		 s, (uintmax_t)me->namemap.nr);
-	debug_mm("mailmap: - simple: '%s' <%s>\n",
-		 debug_str(me->name), debug_str(me->email));
 
 	free(me->name);
 	free(me->email);
@@ -93,8 +77,6 @@ static void add_mapping(struct string_list *map,
 	}
 
 	if (!old_name) {
-		debug_mm("mailmap: adding (simple) entry for '%s'\n", old_email);
-
 		/* Replace current name and new email for simple entry */
 		if (new_name) {
 			free(me->name);
@@ -106,15 +88,10 @@ static void add_mapping(struct string_list *map,
 		}
 	} else {
 		struct mailmap_info *mi = xcalloc(1, sizeof(struct mailmap_info));
-		debug_mm("mailmap: adding (complex) entry for '%s'\n", old_email);
 		mi->name = xstrdup_or_null(new_name);
 		mi->email = xstrdup_or_null(new_email);
 		string_list_insert(&me->namemap, old_name)->util = mi;
 	}
-
-	debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
-		 debug_str(old_name), old_email,
-		 debug_str(new_name), debug_str(new_email));
 }
 
 static char *parse_name_and_email(char *buffer, char **name,
@@ -250,11 +227,8 @@ int read_mailmap(struct string_list *map)
 
 void clear_mailmap(struct string_list *map)
 {
-	debug_mm("mailmap: clearing %"PRIuMAX" entries...\n",
-		 (uintmax_t)map->nr);
 	map->strdup_strings = 1;
 	string_list_clear_func(map, free_mailmap_entry);
-	debug_mm("mailmap: cleared\n");
 }
 
 /*
@@ -315,10 +289,6 @@ int map_user(struct string_list *map,
 	struct string_list_item *item;
 	struct mailmap_entry *me;
 
-	debug_mm("map_user: map '%.*s' <%.*s>\n",
-		 (int)*namelen, debug_str(*name),
-		 (int)*emaillen, debug_str(*email));
-
 	item = lookup_prefix(map, *email, *emaillen);
 	if (item) {
 		me = (struct mailmap_entry *)item->util;
@@ -336,10 +306,8 @@ int map_user(struct string_list *map,
 	}
 	if (item) {
 		struct mailmap_info *mi = (struct mailmap_info *)item->util;
-		if (mi->name == NULL && mi->email == NULL) {
-			debug_mm("map_user:  -- (no simple mapping)\n");
+		if (mi->name == NULL && mi->email == NULL)
 			return 0;
-		}
 		if (mi->email) {
 				*email = mi->email;
 				*emaillen = strlen(*email);
@@ -348,11 +316,7 @@ int map_user(struct string_list *map,
 				*name = mi->name;
 				*namelen = strlen(*name);
 		}
-		debug_mm("map_user:  to '%.*s' <%.*s>\n",
-			 (int)*namelen, debug_str(*name),
-			 (int)*emaillen, debug_str(*email));
 		return 1;
 	}
-	debug_mm("map_user:  --\n");
 	return 0;
 }
diff --git a/transport.c b/transport.c
index fa9bc3be08..c5e201f6a3 100644
--- a/transport.c
+++ b/transport.c
@@ -170,7 +170,8 @@ static struct ref *get_refs_from_bundle(struct transport *transport,
 }
 
 static int fetch_refs_from_bundle(struct transport *transport,
-			       int nr_heads, struct ref **to_fetch)
+				  int nr_heads UNUSED,
+				  struct ref **to_fetch UNUSED)
 {
 	struct bundle_transport_data *data = transport->data;
 	struct strvec extra_index_pack_args = STRVEC_INIT;