netdev - Re: [PATCH v9 0/9] Request for inclusion: per-cgroup tcp memory pressure controls

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Date:	Tue, 13 Dec 2011 14:59:08 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	christoph.paasch@...ouvain.be
Cc:	David Miller <davem@...emloft.net>, glommer@...allels.com,
	linux-kernel@...r.kernel.org, paul@...lmenage.org,
	lizf@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
	ebiederm@...ssion.com, gthelen@...gle.com, netdev@...r.kernel.org,
	linux-mm@...ck.org, kirill@...temov.name, avagin@...allels.com,
	devel@...nvz.org, cgroups@...r.kernel.org
Subject: Re: [PATCH v9 0/9] Request for inclusion: per-cgroup tcp memory
 pressure controls

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 <christoph.paasch@...ouvain.be>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 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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