linux-kernel - Re: [RFC] scripts: kernel-doc: avoid warnings due to initial commented lines in file

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Date:   Tue, 9 Mar 2021 14:30:48 +0100
From:   Markus Heiser <markus.heiser@...marit.de>
To:     Aditya Srivastava <yashsri421@...il.com>, corbet@....net
Cc:     lukas.bulwahn@...il.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [RFC] scripts: kernel-doc: avoid warnings due to initial
 commented lines in file


Am 09.03.21 um 13:53 schrieb Aditya Srivastava:
> Starting commented lines in a file mostly contains comments describing
> license, copyright or general information about the file.
> 
> E.g., in sound/pci/ctxfi/ctresource.c, initial comment lines describe
> its copyright and other related file informations.

The opening comment mark /** is used for kernel-doc comments [1]

[1] 
https://www.kernel.org/doc/html/latest/doc-guide/kernel-doc.html#how-to-format-kernel-doc-comments

   -- Markus --

> 
> But as kernel-doc reads these lines, it results in ineffective warnings by
> kernel-doc, related to these.
> 
> Provide a simple fix by skipping first three lines in a file for checking
> kernel-doc comments.
> 
> Suggested-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> Signed-off-by: Aditya Srivastava <yashsri421@...il.com>
> ---
>   scripts/kernel-doc | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/kernel-doc b/scripts/kernel-doc
> index e1e562b2e2e7..431add05248e 100755
> --- a/scripts/kernel-doc
> +++ b/scripts/kernel-doc
> @@ -2375,6 +2375,7 @@ sub process_file($) {
>       my $file;
>       my $initial_section_counter = $section_counter;
>       my ($orig_file) = @_;
> +    my $lineno = 0;	# to maintain the count of line number in a file
>   
>       $file = map_filename($orig_file);
>   
> @@ -2388,13 +2389,16 @@ sub process_file($) {
>   
>       $section_counter = 0;
>       while (<IN_FILE>) {
> +	$lineno++;
>   	while (s/\\\s*$//) {
>   	    $_ .= <IN_FILE>;
> +	    $lineno++;
>   	}
>   	# Replace tabs by spaces
>           while ($_ =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {};
>   	# Hand this line to the appropriate state handler
> -	if ($state == STATE_NORMAL) {
> +	if ($state == STATE_NORMAL
> +	    && $lineno > 3) {	# to avoid starting comment lines describing the file
>   	    process_normal();
>   	} elsif ($state == STATE_NAME) {
>   	    process_name($file, $_);
>