net: fix build error if CONFIG_CGROUPS=n

Eric Dumazet · davem330 · commit 9f048bfba15a · 2011-12-13T13:45:17.000-05:00
Reported-by: Christoph Paasch &lt;christoph.paasch@uclouvain.be&gt;
Signed-off-by: Eric Dumazet &lt;eric.dumazet@gmail.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/include/net/sock.h b/include/net/sock.h
@@ -64,6 +64,8 @@
 #include <net/dst.h>
 #include <net/checksum.h>
 
+struct cgroup;
+struct cgroup_subsys;
 int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss);
 void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss);
 /*
