netdev - Re: [PATCH] netns: move {inc,dec}_net

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Date:   Fri, 23 Sep 2016 13:42:59 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        WANG Cong <xiyou.wangcong@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netns: move {inc,dec}_net_namespaces into #ifdef

Arnd Bergmann <arnd@...db.de> writes:

> With the newly enforced limit on the number of namespaces,
> we get a build warning if CONFIG_NETNS is disabled:
>
> net/core/net_namespace.c:273:13: error: 'dec_net_namespaces' defined but not used [-Werror=unused-function]
> net/core/net_namespace.c:268:24: error: 'inc_net_namespaces' defined but not used [-Werror=unused-function]
>
> This moves the two added functions inside the #ifdef that guards
> their callers.
>
> Fixes: 703286608a22 ("netns: Add a limit on the number of net namespaces")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied to my namespace tree thanks.

This was a hold over from calling those functions in a different location.

Eric

> ---
>  net/core/net_namespace.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
> index d0eb13d3226b..989434f36f96 100644
> --- a/net/core/net_namespace.c
> +++ b/net/core/net_namespace.c
> @@ -265,16 +265,6 @@ struct net *get_net_ns_by_id(struct net *net, int id)
>  	return peer;
>  }
>  
> -static struct ucounts *inc_net_namespaces(struct user_namespace *ns)
> -{
> -	return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES);
> -}
> -
> -static void dec_net_namespaces(struct ucounts *ucounts)
> -{
> -	dec_ucount(ucounts, UCOUNT_NET_NAMESPACES);
> -}
> -
>  /*
>   * setup_net runs the initializers for the network namespace object.
>   */
> @@ -319,6 +309,16 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
>  
>  
>  #ifdef CONFIG_NET_NS
> +static struct ucounts *inc_net_namespaces(struct user_namespace *ns)
> +{
> +	return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES);
> +}
> +
> +static void dec_net_namespaces(struct ucounts *ucounts)
> +{
> +	dec_ucount(ucounts, UCOUNT_NET_NAMESPACES);
> +}
> +
>  static struct kmem_cache *net_cachep;
>  static struct workqueue_struct *netns_wq;