linux-kernel - Re: [PATCH -mmots] checkpatch: add fix for non-standard signature

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Date:   Wed, 02 Dec 2020 10:56:54 -0800
From:   Joe Perches <joe@...ches.com>
To:     Aditya Srivastava <yashsri421@...il.com>
Cc:     lukas.bulwahn@...il.com, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH -mmots] checkpatch: add fix for non-standard signature -
 co-authored-by

On Thu, 2020-12-03 at 00:00 +0530, Aditya Srivastava wrote:
> Currently, checkpatch.pl warns us for BAD_SIGN_OFF on the usage of
> non-standard signatures.
>
> An evaluation on v4.13..v5.8 showed that out of 539 warnings due to
> non-standard signatures, 43 are due to the use of 'Co-authored-by'
> tag, which may seem correct, but is not standard.
> 
> The standard signature equivalent for 'Co-authored-by' is
> 'Co-developed-by'.

I'm not going to ack this as I don't mind non-standard signatures.

You should also always use patch subject versioning and include
a changelog after the --- line.

> Provide a fix by suggesting users with this signature alternative and
> replacing.
> 
> Signed-off-by: Aditya Srivastava <yashsri421@...il.com>
> ---
>  scripts/checkpatch.pl | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 4a026926139f..fc036d545d2d 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2832,6 +2832,9 @@ sub process {
>  
> 
>  			if ($sign_off !~ /$signature_tags/) {
>  				my $suggested_signature = find_standard_signature($sign_off);
> +				if ($sign_off =~ /co-authored-by:/i) {
> +					$suggested_signature = "Co-developed-by:";
> +				}
>  				if ($suggested_signature eq "") {
>  					WARN("BAD_SIGN_OFF",
>  					     "Non-standard signature: $sign_off\n" . $herecurr);