linux-kernel - Re: [PATCH] sysctl: remove impossible condition check

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Message-ID: <alpine.LNX.2.00.1106011521160.12980@swampdragon.chaosbits.net>
Date:	Wed, 1 Jun 2011 15:25:52 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
cc:	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...nel.dk>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] sysctl: remove impossible condition check

On Wed, 1 Jun 2011, Lucas De Marchi wrote:

> Signed-off-by: Lucas De Marchi <lucas.demarchi@...fusion.mobi>
> ---
>  fs/proc/proc_sysctl.c |    5 +----
>  1 files changed, 1 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index 2e5d3ec..98e82d4 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -52,11 +52,8 @@ static struct ctl_table *find_in_table(struct ctl_table *p, struct qstr *name)
>  {
>  	int len;
>  	for ( ; p->procname; p++) {
> -
> -		if (!p->procname)
> -			continue;
> -
>  		len = strlen(p->procname);
> +
>  		if (len != name->len)
>  			continue;

How about compacting it even further by getting rid of the 'len' variable 
as well?
Like this:

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 proc_sysctl.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index f50133c..bd7f7af 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -49,17 +49,11 @@ out:
 
 static struct ctl_table *find_in_table(struct ctl_table *p, struct qstr *name)
 {
-	int len;
 	for ( ; p->procname; p++) {
-
-		if (!p->procname)
-			continue;
-
-		len = strlen(p->procname);
-		if (len != name->len)
+		if (strlen(p->procname) != name->len)
 			continue;
 
-		if (memcmp(p->procname, name->name, len) != 0)
+		if (memcmp(p->procname, name->name, name->len) != 0)
 			continue;
 
 		/* I have a match */


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
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