Subject: Re: [PATCH 1/2] netpoll: Remove unused EXPORT_SYMBOLs of netpoll_poll and netpoll_poll_dev

From: Harry Wei <[email-masked]>
Date: Mon, 4 Jul 2011 14:53:22 +0800

On Thu, Jun 30, 2011 at 06:08:57PM -0700, Joe Perches wrote:
> Unused symbols waste space.
> 
> Commit 0e34e93177fb
> "(netpoll: add generic support for bridge and bonding devices)"
> added the symbol more than a year ago with the promise of "future use".
> 
> Because it is so far unused, remove it for now.
> It can be easily readded if or when it actually needs to be used.
> 
> cc: WANG Cong <[email-masked]>
> Signed-off-by: Joe Perches <[email-masked]>
> ---
>  include/linux/netpoll.h |    2 --
>  net/core/netpoll.c      |    6 ++----
>  2 files changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
> index 79358bb..5dfa091 100644
> --- a/include/linux/netpoll.h
> +++ b/include/linux/netpoll.h
> @@ -40,8 +40,6 @@ struct netpoll_info {
>  	struct netpoll *netpoll;
>  };
>  
> -void netpoll_poll_dev(struct net_device *dev);
> -void netpoll_poll(struct netpoll *np);
>  void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
>  void netpoll_print_options(struct netpoll *np);
>  int netpoll_parse_options(struct netpoll *np, char *opt);
> diff --git a/net/core/netpoll.c b/net/core/netpoll.c
> index 18d9cbd..4ce595e 100644
> --- a/net/core/netpoll.c
> +++ b/net/core/netpoll.c
> @@ -177,7 +177,7 @@ static void service_arp_queue(struct netpoll_info *npi)
>  	}
>  }
>  
> -void netpoll_poll_dev(struct net_device *dev)
> +static void netpoll_poll_dev(struct net_device *dev)
Hi Joe,
You have removed the function declaration in include/linux/netpoll.h.
And you changed the function like 
static void netpoll_poll_dev(...)
{
	...
}
But i don't know its usage.
The 'static' before this function just says the active area of 'netpoll_poll_dev'
is in the file net/core/netpoll.c. What is the purpose? Could you please tell me?

Thanks in advance.

>  {
>  	const struct net_device_ops *ops;
>  
> @@ -208,13 +208,11 @@ void netpoll_poll_dev(struct net_device *dev)
>  
>  	zap_completion_queue();
>  }
> -EXPORT_SYMBOL(netpoll_poll_dev);
>  
> -void netpoll_poll(struct netpoll *np)
> +static void netpoll_poll(struct netpoll *np)
>  {
>  	netpoll_poll_dev(np->dev);
>  }
> -EXPORT_SYMBOL(netpoll_poll);
>  
>  static void refill_skbs(void)
>  {
> -- 
> 1.7.6.rc1