linux-kernel - Re: [Outreachy kernel] [PATCH] net: netfilter: remove unused variable

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Message-ID: <alpine.DEB.2.20.1703291616070.2989@hadrien>
Date:   Wed, 29 Mar 2017 16:16:35 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
cc:     outreachy-kernel@...glegroups.com,
        Wensong Zhang <wensong@...ux-vs.org>,
        Simon Horman <horms@...ge.net.au>,
        Julian Anastasov <ja@....bg>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        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: [Outreachy kernel] [PATCH] net: netfilter: remove unused
 variable



On Wed, 29 Mar 2017, Arushi Singhal wrote:

> This patch uses the following coccinelle script to remove
> a variable that was simply used to store the return
> value of a function call before returning it:
>
> @@
> identifier len,f;
> @@
>
> -int len;
>  ... when != len
>      when strict
> -len =
> +return
>         f(...);
> -return len;
>
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
> ---
>  net/netfilter/ipvs/ip_vs_ftp.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
> index d30c327bb578..9e1e682610ef 100644
> --- a/net/netfilter/ipvs/ip_vs_ftp.c
> +++ b/net/netfilter/ipvs/ip_vs_ftp.c
> @@ -482,11 +482,9 @@ static struct pernet_operations ip_vs_ftp_ops = {
>
>  static int __init ip_vs_ftp_init(void)
>  {
> -	int rv;
>
> -	rv = register_pernet_subsys(&ip_vs_ftp_ops);
>  	/* rcu_barrier() is called by netns on error */
> -	return rv;
> +	return register_pernet_subsys(&ip_vs_ftp_ops);

It looks like you end up with an unnecessary blank line at the beginning
of the function.

julia

>  }
>
>  /*
> --
> 2.11.0
>
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