[PATCH next-20130703] net: sock: Add ifdef CONFIG_MEMCG_KMEM for mem_cgroup_sockets_{init,destroy}

When "CONFIG_MEMCG_KMEM=n" I see this in my build-log:

 LD      init/built-in.o
mm/built-in.o: In function `mem_cgroup_css_free':
memcontrol.c:(.text+0x5caa6): undefined reference to `mem_cgroup_sockets_destroy'
make[2]: *** [vmlinux] Error 1

Inspired by the ifdef for mem_cgroup_sockets_{init,destroy} here...

[ net/core/sock.c ]

 #ifdef CONFIG_MEMCG_KMEM
 int mem_cgroup_sockets_init()
 ...
 void mem_cgroup_sockets_destroy()
 ...
 #endif

...I did the the same for both in "include/net/sock.h".

This fixes the issue for me in next-20130703.

Signed-off-by: Sedat Dilek <redacted>
---
v3: Mixed up the order of comments: CONFIG_NET should come last.
    (Thanks Sergei Shtylyov)
v2: git dislikes lines beginning with hash ('#') in the changelog.

Signed-off-by: Sedat Dilek <redacted>
---
 include/net/sock.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index ea6206c..37d2374 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h

@@ -71,6 +71,7 @@
 struct cgroup;
 struct cgroup_subsys;
 #ifdef CONFIG_NET
+#ifdef CONFIG_MEMCG_KMEM
 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss);
 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg);
 #else

@@ -83,7 +84,8 @@ static inline
 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
 {
 }
-#endif
+#endif /* CONFIG_MEMCG_KMEM */
+#endif /* CONFIG_NET */
 /*
  * This structure really needs to be cleaned up.
  * Most of it is for TCP, and not used by any of

-- 
1.8.3.2

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