linux-kernel - Re: [PATCH] checkpatch: disable commit log length check warning for signature tag

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Date:   Sun, 26 Jul 2020 23:14:42 -0700
From:   Joe Perches <joe@...ches.com>
To:     Nachiket Naganure <nachiketun8@...il.com>, apw@...onical.com,
        lukas.bulwahn@...il.com, skhan@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] checkpatch: disable commit log length check warning for
 signature tag

On Mon, 2020-07-27 at 11:24 +0530, Nachiket Naganure wrote:
> Disable commit log length check in case of signature tag. If the commit
> log line has valid signature tags such as "Reported-and-tested-by" with
> more than 75 characters, suppress the long length warning.
> 
> For instance in commit ac854131d984 ("USB: core: Fix misleading driver bug
> report"), the corresponding patch contains a "Reported by" tag line which
> exceeds 75 chars. And there is no valid way to shorten the length.
> 
> Signed-off-by: Nachiket Naganure <nachiketun8@...il.com>
> ---
>  scripts/checkpatch.pl | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 197436b20288..46237e9e0550 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2806,6 +2806,8 @@ sub process {
>  					# filename then :
>  		      $line =~ /^\s*(?:Fixes:|Link:)/i ||
>  					# A Fixes: or Link: line
> +		      $line =~ /$signature_tags/ ||
> +					# Check for signature_tags
>  		      $commit_log_possible_stack_dump)) {
>  			WARN("COMMIT_LOG_LONG_LINE",
>  			     "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);

OK, but the test should be:

		      $line =~ /^\s*$signature_tags/ ||

so the line has to start with a signature and
it won't match on signature tags in the middle
of other content on the same line.