Hi Arnd,

FYI, kernel build failed on

commit: 652eaf71a39f10c2cb78f924ca5d0b070454dbe4  mm/memcontrol: provide sock_update_memcg without INET
config: x86_64-randconfig-h062 (attached as .config)

This also occurs in branch HEAD: arm-soc/testing/defconfig-warnings

All error/warnings:

mm/memcontrol.c:423:6: error: redefinition of 'sock_update_memcg'
In file included from mm/memcontrol.c:25:0:
include/linux/memcontrol.h:403:20: note: previous definition of 'sock_update_memcg' was here
mm/memcontrol.c:457:6: error: redefinition of 'sock_release_memcg'
In file included from mm/memcontrol.c:25:0:
include/linux/memcontrol.h:406:20: note: previous definition of 'sock_release_memcg' was here

vim +423 mm/memcontrol.c

7ffc0edc Michal Hocko  2012-10-08  417  	return (memcg == root_mem_cgroup);
7ffc0edc Michal Hocko  2012-10-08  418  }
7ffc0edc Michal Hocko  2012-10-08  419  
e1aab161 Glauber Costa 2011-12-11  420  /* Writing them here to avoid exposing memcg's inner layout */
652eaf71 Arnd Bergmann 2012-10-10  421  #if defined(CONFIG_NET) && defined(CONFIG_MEMCG_KMEM)
e1aab161 Glauber Costa 2011-12-11  422  
e1aab161 Glauber Costa 2011-12-11 @423  void sock_update_memcg(struct sock *sk)
e1aab161 Glauber Costa 2011-12-11  424  {
376be5ff Glauber Costa 2012-01-20  425  	if (mem_cgroup_sockets_enabled) {
e1aab161 Glauber Costa 2011-12-11  426  		struct mem_cgroup *memcg;

The code at line 423 was first introduced by commit:
e1aab16 socket: initial cgroup code.


---
0-DAY kernel build testing backend         Open Source Technology Center
Fengguang Wu, Yuanhan Liu                              Intel Corporation