X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fnet-util.c;h=ba21ae437f3da968aae980c584a32c07a0ffca1c;hp=630be18e56ecba042a0e751f326b2fa43f586afb;hb=b6e2f3293d0f9a821819d96038eec2a19062151f;hpb=377a218f876507fb8be9c21ef4121fa2576ec317

diff --git a/src/shared/net-util.c b/src/shared/net-util.c
index 630be18e5..ba21ae437 100644
--- a/src/shared/net-util.c
+++ b/src/shared/net-util.c
@@ -59,18 +59,9 @@ bool net_match_config(const struct ether_addr *match_mac,
 }
 
 unsigned net_netmask_to_prefixlen(const struct in_addr *addr) {
-        unsigned len = 0;
-        uint32_t mask;
-
         assert(addr);
 
-        mask = be32toh(addr->s_addr);
-        while (mask) {
-                len++;
-                mask = mask << 1;
-        }
-
-        return len;
+        return 32 - u32ctz(be32toh(addr->s_addr));
 }
 
 int config_parse_ifname(const char *unit,