linux-kernel - Re: [PATCH 11/13] net: Move prototype declaration to header file include/net/net_namespace.h from net/ipx/af

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Date:	Sat, 8 Feb 2014 12:14:29 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Rashika Kheria <rashika.kheria@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 11/13] net: Move prototype declaration to header file
 include/net/net_namespace.h from net/ipx/af_ipx.c

On Sun, Feb 09, 2014 at 01:37:20AM +0530, Rashika Kheria wrote:
> Move prototype declaration of function to header file
> include/net/net_namespace.h from net/ipx/af_ipx.c because they are used
> by more than one file.
> 
> This eliminates the following warning in net/ipx/sysctl_net_ipx.c:
> net/ipx/sysctl_net_ipx.c:33:6: warning: no previous prototype for ‘ipx_register_sysctl’ [-Wmissing-prototypes]
> net/ipx/sysctl_net_ipx.c:38:6: warning: no previous prototype for ‘ipx_unregister_sysctl’ [-Wmissing-prototypes]
> 
> Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>

You should move the entire ifdef/else block into the header file, so
that the stubs are available as well.

>  include/net/net_namespace.h |    3 +++
>  net/ipx/af_ipx.c            |    6 ++----
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
> index da68c9a..a43435c 100644
> --- a/include/net/net_namespace.h
> +++ b/include/net/net_namespace.h
> @@ -162,6 +162,9 @@ extern struct list_head net_namespace_list;
>  struct net *get_net_ns_by_pid(pid_t pid);
>  struct net *get_net_ns_by_fd(int pid);
>  
> +void ipx_register_sysctl(void);
> +void ipx_unregister_sysctl(void);
> +
>  #ifdef CONFIG_NET_NS
>  void __put_net(struct net *net);
>  
> diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c
> index 224d058..aa2abb8 100644
> --- a/net/ipx/af_ipx.c
> +++ b/net/ipx/af_ipx.c
> @@ -54,13 +54,11 @@
>  #include <net/sock.h>
>  #include <net/datalink.h>
>  #include <net/tcp_states.h>
> +#include <net/net_namespace.h>
>  
>  #include <asm/uaccess.h>
>  
> -#ifdef CONFIG_SYSCTL
> -extern void ipx_register_sysctl(void);
> -extern void ipx_unregister_sysctl(void);
> -#else
> +#ifndef CONFIG_SYSCTL
>  #define ipx_register_sysctl()
>  #define ipx_unregister_sysctl()
>  #endif
> -- 
> 1.7.9.5
> 
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