Re: [patch for-linus] memcg, kmem: fix build error when CONFIG_INETis disabled

[Michal Hocko]

On Tue 09-10-12 23:32:35, David Rientjes wrote:
> Commit e1aab161e013 ("socket: initial cgroup code.") causes a build error 
> when CONFIG_INET is disabled in Linus' tree:
> 
> net/built-in.o: In function `sk_update_clone':
> net/core/sock.c:1336: undefined reference to `sock_update_memcg'
> 
> sock_update_memcg() is only defined when CONFIG_INET is enabled, so fix it 
> by defining the dummy function without this option.
> 
> Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>

Acked-by: Michal Hocko <mhocko@xxxxxxx>

Thanks!

> ---
>  Checking the logs, Randy reported this in an email to LKML on 
>  September 24 and didn't get a response...
> 
>  include/linux/memcontrol.h |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -396,7 +396,7 @@ enum {
>  };
>  
>  struct sock;
> -#ifdef CONFIG_MEMCG_KMEM
> +#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
>  void sock_update_memcg(struct sock *sk);
>  void sock_release_memcg(struct sock *sk);
>  #else
> @@ -406,6 +406,6 @@ static inline void sock_update_memcg(struct sock *sk)
>  static inline void sock_release_memcg(struct sock *sk)
>  {
>  }
> -#endif /* CONFIG_MEMCG_KMEM */
> +#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
>  #endif /* _LINUX_MEMCONTROL_H */
>  
> 
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-- 
Michal Hocko
SUSE Labs
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