linux-kernel - Re: [PATCH] checkpatch: add check for NONNETWORKING_BLOCK_COMMENT

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Date:   Wed, 10 Jun 2020 14:16:03 -0700
From:   Joe Perches <joe@...ches.com>
To:     Scott Branden <scott.branden@...adcom.com>,
        Andy Whitcroft <apw@...onical.com>
Cc:     BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: add check for
 NONNETWORKING_BLOCK_COMMENT_STYLE

On Wed, 2020-06-10 at 13:26 -0700, Scott Branden wrote:
> NETWORKING_BLOCK_COMMENT_STYLE is supported by checkpatch but there
> doesn't seem to be any check for the standard block comment style.
> Add support for NONNETWORKING_BLOCK_COMMENT_STYLE to check for empty /*
> on first line of non-networking block comments.

I think there are _way_ too many instances of this form
in non-networking code to enable this.

$ git grep -P '^\s*/\*\s*\S.*[^\*][^\\]\s*$' -- '*.[ch]' | \
  grep -v -P '^(drivers/net/|net/)' | \
  wc -l
51407

(with a few false positives)

Does anyone really care if non-network code uses
this style?

	/* multiline
	 * comment
	 */

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3408,6 +3408,16 @@ sub process {
>  			     "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
>  		}
>  
> +# Non-Networking with an empty initial /*
> +		if ($realfile !~ m@^(drivers/net/|net/)@ &&
> +		    $prevrawline =~ /^\+[ \t]*\/\*[ \t]/ &&
> +		    $prevrawline !~ /\*\/[ \t]*$/ &&		#no trailing */
> +		    $rawline =~ /^\+[ \t]*\*/ &&
> +		    $realline > 2) {
> +			WARN("NONNETWORKING_BLOCK_COMMENT_STYLE",
> +			     "non-networking block comments use an empty /* on first line\n" . $hereprev);
> +		}
> +
>  # Block comments use * on subsequent lines
>  		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
>  		    $prevrawline =~ /^\+.*?\/\*/ &&		#starting /*