netdev - Re: [PATCH v2 01/10] cgroup: net_cls: Use empty task_cls_classid() when !CONFIG_NET_CLS(

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Date:	Mon, 27 Aug 2012 10:32:55 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Daniel Wagner <wagi@...om.org>
CC:	<netdev@...r.kernel.org>, <cgroups@...r.kernel.org>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	"David S. Miller" <davem@...emloft.net>,
	Gao feng <gaofeng@...fujitsu.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Neil Horman <nhorman@...driver.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH v2 01/10] cgroup: net_cls: Use empty task_cls_classid()
 when !CONFIG_NET_CLS(_MODULE)

task_cls_classid() is called by sock_update_classid().

#ifdef CONFIG_CGROUPS
extern void sock_update_classid(struct sock *sk);
#else
static inline void sock_update_classid(struct sock *sk)
{
}
#endif

Change to define sock_update_classid() only when CONFIG_NET_CLS is enabled, and
then we don't need this patch, and the code will be simpler.

On 2012/8/24 22:01, Daniel Wagner wrote:
> From: Daniel Wagner <daniel.wagner@...-carit.de>
> 
> Signed-off-by: Daniel Wagner <daniel.wagner@...-carit.de>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Gao feng <gaofeng@...fujitsu.com>
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Cc: John Fastabend <john.r.fastabend@...el.com>
> Cc: Li Zefan <lizefan@...wei.com>
> Cc: Neil Horman <nhorman@...driver.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: netdev@...r.kernel.org
> Cc: cgroups@...r.kernel.org
> ---
>  include/net/cls_cgroup.h | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/include/net/cls_cgroup.h b/include/net/cls_cgroup.h
> index a4dc5b0..e2fe2b9 100644
> --- a/include/net/cls_cgroup.h
> +++ b/include/net/cls_cgroup.h
> @@ -24,7 +24,8 @@ struct cgroup_cls_state
>  	u32 classid;
>  };
>  
> -#ifdef CONFIG_NET_CLS_CGROUP
> +#if IS_BUILTIN(CONFIG_NET_CLS_CGROUP)
> +
>  static inline u32 task_cls_classid(struct task_struct *p)
>  {
>  	int classid;
> @@ -39,7 +40,9 @@ static inline u32 task_cls_classid(struct task_struct *p)
>  
>  	return classid;
>  }
> -#else
> +
> +#elif IS_MODULE(CONFIG_NET_CLS_CGROUP)
> +
>  extern int net_cls_subsys_id;
>  
>  static inline u32 task_cls_classid(struct task_struct *p)
> @@ -60,11 +63,16 @@ static inline u32 task_cls_classid(struct task_struct *p)
>  
>  	return classid;
>  }
> -#endif
> +
>  #else
> +
>  static inline u32 task_cls_classid(struct task_struct *p)
>  {
>  	return 0;
>  }
> -#endif
> +
> +#endif /* CONFIG_NET_CLS_CGROUP */
> +
> +#endif /* CONFIG_CGROURPS */
> +
>  #endif  /* _NET_CLS_CGROUP_H */
> 

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