linux-kernel - Re: [PATCH v3] scripts: checkpatch: Check multiple blank lines when deleting code

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Message-ID: <f2f39283-677f-e617-5edb-f55624ac21e2@ghiti.fr>
Date:   Sun, 17 Mar 2019 11:49:24 -0400
From:   Alex Ghiti <alex@...ti.fr>
To:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] scripts: checkpatch: Check multiple blank lines when
 deleting code

On 3/6/19 2:53 PM, Alexandre Ghiti wrote:
> By matching only current line starting with '+', we miss the case
> when deleting code makes consecutive blank lines appear: this patch
> then makes it possible to detect this case by also matching current
> line starting with ' ', which is an already existing blank line.
>
> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
> ---
>
> Changes in v3 as suggested by Joe Perches:
> 	- Do not try to fix this case
> 	- Make this test separate from the insertion one so that warning
> 	  is more explicit
>
> Changes in v2:
> 	- Fix the --fix option
>
>   scripts/checkpatch.pl | 12 +++++++++++-
>   1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index b737ca9d7204..c0728cff292f 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -3296,7 +3296,7 @@ sub process {
>   			}
>   		}
>   
> -# check for multiple consecutive blank lines
> +# check for multiple consecutive blank lines caused by blank line insertion
>   		if ($prevline =~ /^[\+ ]\s*$/ &&
>   		    $line =~ /^\+\s*$/ &&
>   		    $last_blank_line != ($linenr - 1)) {
> @@ -3309,6 +3309,16 @@ sub process {
>   			$last_blank_line = $linenr;
>   		}
>   
> +# check for multiple consecutive blank lines caused by code deletion
> +		if ($prevline =~ /^[\+ ]\s*$/ &&
> +		    $line =~ /^ \s*$/ &&
> +		    $last_blank_line != ($linenr - 1)) {
> +			CHK("LINE_SPACING",
> +			    "Avoid deleting lines that create consecutive blank lines\n" . $hereprev);
> +
> +			$last_blank_line = $linenr;
> +		}
> +
>   # check for missing blank lines after declarations
>   		if ($sline =~ /^\+\s+\S/ &&			#Not at char 1
>   			# actual declarations


Hi Joe,

Can I do something more this patch ?

Thanks,

Alex