linux-kernel - Re: [PATCH] checkpatch: don't match against empty $const

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Date:   Thu, 20 Oct 2016 01:16:28 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jerome Forissier <jerome.forissier@...aro.org>,
        Andy Whitcroft <apw@...onical.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: don't match against empty $const_structs

On Thu, 2016-10-20 at 10:12 +0200, Jerome Forissier wrote:
> When $conststructsfile does not exist or is empty, we may get false
> warnings such as:
> WARNING: struct  should normally be const
> 
> Fix that by not running the string match if $const_structs is empty.

Why should $const_structs ever be empty?

> Signed-off-by: Jerome Forissier <jerome.forissier@...aro.org>
> ---
>  scripts/checkpatch.pl | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index a8368d1..722a319 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -6010,7 +6010,8 @@ sub process {
>  		}
>  
>  # check for various structs that are normally const (ops, kgdb, device_tree)
> -		if ($line !~ /\bconst\b/ &&
> +		if ($const_structs ne "" &&
> +		    $line !~ /\bconst\b/ &&
>  		    $line =~ /\bstruct\s+($const_structs)\b/) {
>  			WARN("CONST_STRUCT",
>  			     "struct $1 should normally be const\n" .
>