Le mardi 13 décembre 2011 à 14:49 +0100, Christoph Paasch a écrit :

now there are plenty of compiler-warnings when CONFIG_CGROUPS is not set:

In file included from include/linux/tcp.h:211:0,
                 from include/linux/ipv6.h:221,
                 from include/net/ip_vs.h:23,
                 from kernel/sysctl_binary.c:6:
include/net/sock.h:67:57: warning: ‘struct cgroup_subsys’ declared
inside parameter list [enabled by default]
include/net/sock.h:67:57: warning: its scope is only this definition or
declaration, which is probably not what you want [enabled by default]
include/net/sock.h:67:57: warning: ‘struct cgroup’ declared inside
parameter list [enabled by default]
include/net/sock.h:68:61: warning: ‘struct cgroup_subsys’ declared
inside parameter list [enabled by default]
include/net/sock.h:68:61: warning: ‘struct cgroup’ declared inside
parameter list [enabled by default]


Because struct cgroup is only declared if CONFIG_CGROUPS is enabled.
(cfr. linux/cgroup.h)

Yes, we probably need forward reference like this :

Thanks !

[PATCH net-next] net: fix build error if CONFIG_CGROUPS=n

Reported-by: Christoph Paasch <redacted>
Signed-off-by: Eric Dumazet <redacted>
---
 include/net/sock.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/net/sock.h b/include/net/sock.h
index 18ecc99..6fe0dae 100644
--- 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);
 /*


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