MINOR: protocol: move __protocol_by_family to read_mostly
This one is used for each outgoing connection and never changes after
boot, move it to read_mostly.
diff --git a/src/protocol.c b/src/protocol.c
index 77396d0..cd574f2 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -24,7 +24,7 @@
/* List head of all registered protocols */
static struct list protocols = LIST_HEAD_INIT(protocols);
-struct protocol *__protocol_by_family[AF_CUST_MAX][2][2] = { };
+struct protocol *__protocol_by_family[AF_CUST_MAX][2][2] __read_mostly = { };
/* This is the global spinlock we may need to register/unregister listeners or
* protocols. Its main purpose is in fact to serialize the rare stop/deinit()