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[PATCH] net: netfilter: remove unused variable

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  [PATCH] net: netfilter: remove unused variable Arushi Singhal <arushisinghal19971997@gmail.com> - 2017-03-29 15:40 +0200
    Re: [Outreachy kernel] [PATCH] net: netfilter: remove unused  variable Julia Lawall <julia.lawall@lip6.fr> - 2017-03-29 16:20 +0200

#1611956 — [PATCH] net: netfilter: remove unused variable

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@gmail.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);
 }
 
 /*
-- 
2.11.0

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#1611976 — 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@gmail.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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