linux-kernel - Re: [PATCH 1/2] netfilter: ipvs: avoid unused variable warnings

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Date:	Wed, 27 Jan 2016 22:01:42 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Arnd Bergmann <arnd@...db.de>
cc:	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	linux-arm-kernel@...ts.infradead.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] netfilter: ipvs: avoid unused variable warnings


	Hello,

On Wed, 27 Jan 2016, Arnd Bergmann wrote:

> The proc_create() and remove_proc_entry() functions do not reference
> their arguments when CONFIG_PROC_FS is disabled, so we get a couple
> of warnings about unused variables in IPVS:
> 
> ipvs/ip_vs_app.c:608:14: warning: unused variable 'net' [-Wunused-variable]
> ipvs/ip_vs_ctl.c:3950:14: warning: unused variable 'net' [-Wunused-variable]
> ipvs/ip_vs_ctl.c:3994:14: warning: unused variable 'net' [-Wunused-variable]
> 
> This removes the local variables and instead looks them up separately
> for each use, which obviously avoids the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 4c50a8ce2b63 ("netfilter: ipvs: avoid unused variable warning")

	Looks like your previous patch for ip_vs_app_net_cleanup
was delayed in ipvs-next tree. I guess, Simon should drop it and
use this one instead when net-next opens:

Acked-by: Julian Anastasov <ja@....bg>

> ---
>  net/netfilter/ipvs/ip_vs_app.c |  8 ++------
>  net/netfilter/ipvs/ip_vs_ctl.c | 15 ++++++---------
>  2 files changed, 8 insertions(+), 15 deletions(-)
> 
> diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
> index 0328f7250693..299edc6add5a 100644
> --- a/net/netfilter/ipvs/ip_vs_app.c
> +++ b/net/netfilter/ipvs/ip_vs_app.c
> @@ -605,17 +605,13 @@ static const struct file_operations ip_vs_app_fops = {
>  
>  int __net_init ip_vs_app_net_init(struct netns_ipvs *ipvs)
>  {
> -	struct net *net = ipvs->net;
> -
>  	INIT_LIST_HEAD(&ipvs->app_list);
> -	proc_create("ip_vs_app", 0, net->proc_net, &ip_vs_app_fops);
> +	proc_create("ip_vs_app", 0, ipvs->net->proc_net, &ip_vs_app_fops);
>  	return 0;
>  }
>  
>  void __net_exit ip_vs_app_net_cleanup(struct netns_ipvs *ipvs)
>  {
> -	struct net *net = ipvs->net;
> -
>  	unregister_ip_vs_app(ipvs, NULL /* all */);
> -	remove_proc_entry("ip_vs_app", net->proc_net);
> +	remove_proc_entry("ip_vs_app", ipvs->net->proc_net);
>  }
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index e7c1b052c2a3..bfb4f8372b83 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -3947,7 +3947,6 @@ static struct notifier_block ip_vs_dst_notifier = {
>  
>  int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
>  {
> -	struct net *net = ipvs->net;
>  	int i, idx;
>  
>  	/* Initialize rs_table */
> @@ -3974,9 +3973,9 @@ int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
>  
>  	spin_lock_init(&ipvs->tot_stats.lock);
>  
> -	proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
> -	proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
> -	proc_create("ip_vs_stats_percpu", 0, net->proc_net,
> +	proc_create("ip_vs", 0, ipvs->net->proc_net, &ip_vs_info_fops);
> +	proc_create("ip_vs_stats", 0, ipvs->net->proc_net, &ip_vs_stats_fops);
> +	proc_create("ip_vs_stats_percpu", 0, ipvs->net->proc_net,
>  		    &ip_vs_stats_percpu_fops);
>  
>  	if (ip_vs_control_net_init_sysctl(ipvs))
> @@ -3991,13 +3990,11 @@ err:
>  
>  void __net_exit ip_vs_control_net_cleanup(struct netns_ipvs *ipvs)
>  {
> -	struct net *net = ipvs->net;
> -
>  	ip_vs_trash_cleanup(ipvs);
>  	ip_vs_control_net_cleanup_sysctl(ipvs);
> -	remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
> -	remove_proc_entry("ip_vs_stats", net->proc_net);
> -	remove_proc_entry("ip_vs", net->proc_net);
> +	remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
> +	remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
> +	remove_proc_entry("ip_vs", ipvs->net->proc_net);
>  	free_percpu(ipvs->tot_stats.cpustats);
>  }
>  
> -- 
> 2.7.0

Regards

--
Julian Anastasov <ja@....bg>