linux-kernel - Re: [patch] checkpatch: complain about GW-BASIC style label names

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Date:	Thu, 07 May 2015 06:47:51 -0700
From:	Joe Perches <joe@...ches.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch] checkpatch: complain about GW-BASIC style label names

On Thu, 2015-05-07 at 14:21 +0300, Dan Carpenter wrote:
> GW-BASIC style label names are quite common.  This generates a warning
> like:
> 
> 	WARNING: bad label name
> 	#795: FILE: drivers/ata/pata_mpc52xx.c:795:
> 	+ err2:

Hey Dan.

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -4023,6 +4023,16 @@ sub process {
>  			}
>  		}
>  
> +#avoid GW-BASIC style label names
> +		if ($line=~/^\+\s*(err|error|fail|out)[0-9]+:/) {

Labels aren't always only lower case.

This may have false positives with ?: uses like
	a = foo ?
		err1:err2;

> +			if (WARN("LABEL_NAME",
> +				 "bad label name\n" . $herecurr) &&
> +			    $fix) {
> +				$fixed[$fixlinenr] =~
> +				    s/^(.)\s+/$1/;
> +			}
> +		}

There already is a $fix option in the INDENTED_LABEL test
above this one and isn't needed or wanted here.

It may be better to use a message like:
	"Prefer functionally descriptive label naming (ie: label<why>:)\n"


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