hashmap: introduce hash_ops to make struct Hashmap smaller

It is redundant to store 'hash' and 'compare' function pointers in
struct Hashmap separately. The functions always comprise a pair.
Store a single pointer to struct hash_ops instead.

systemd keeps hundreds of hashmaps, so this saves a little bit of
memory.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/resolve/resolved-dns-zone.c b/src/resolve/resolved-dns-zone.c
index b53e957d76..8098ff5e70 100644
--- a/src/resolve/resolved-dns-zone.c
+++ b/src/resolve/resolved-dns-zone.c
@@ -126,11 +126,11 @@ static int dns_zone_init(DnsZone *z) {
 
         assert(z);
 
-        r = hashmap_ensure_allocated(&z->by_key, dns_resource_key_hash_func, dns_resource_key_compare_func);
+        r = hashmap_ensure_allocated(&z->by_key, &dns_resource_key_hash_ops);
         if (r < 0)
                 return r;
 
-        r = hashmap_ensure_allocated(&z->by_name, dns_name_hash_func, dns_name_compare_func);
+        r = hashmap_ensure_allocated(&z->by_name, &dns_name_hash_ops);
         if (r < 0)
                 return r;
 
@@ -194,7 +194,7 @@ static int dns_zone_item_probe_start(DnsZoneItem *i)  {
                         return r;
         }
 
-        r = set_ensure_allocated(&t->zone_items, NULL, NULL);
+        r = set_ensure_allocated(&t->zone_items, NULL);
         if (r < 0)
                 goto gc;