linux-kernel - Re: [PATCH] checkpatch: Resolve improper warning for krealloc arg reuse

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Date:   Wed, 18 Jul 2018 08:50:29 -0700
From:   Joe Perches <joe@...ches.com>
To:     Manish Narani <manish.narani@...inx.com>, apw@...onical.com,
        linux-kernel@...r.kernel.org
Cc:     anirudh@...inx.com, sgoud@...inx.com, svemula@...inx.com
Subject: Re: [PATCH] checkpatch: Resolve improper warning for krealloc arg
 reuse

On Wed, 2018-07-18 at 19:25 +0530, Manish Narani wrote:
> Correct the check for reuse of krealloc. It gives false warning when a
> structure member variable name and krealloc argument name is same.
> 
> For Example:
> {
> 	...
> 	abc.def_var = krealloc(def_var, sizeof(*def_var),
> 				    GFP_KERNEL);
> 	...
> }
> 
> $ ./scripts/checkpatch.pl -f file.c
> 
> WARNING: Reusing the krealloc arg is almost always a bug
> +	abc.def_var = krealloc(def_var, sizeof(*def_var),
> 
> This patch resolves the above false warning.
> 
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  scripts/checkpatch.pl | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -6119,7 +6119,7 @@ sub process {
>  
>  # check for krealloc arg reuse
>  		if ($^V && $^V ge 5.10.0 &&
> -		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
> +		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/ && $line !~ m/[\.|\-\>].*\s*\=\s*.*/) {

Thanks but nack.
This is more an issue with $Lval.
I'll look around for a solution.