linux-kernel - Re: [PATCH v2] checkpatch: add fix option for LOGICAL

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Date:   Sat, 21 Nov 2020 08:56:05 -0800
From:   Joe Perches <joe@...ches.com>
To:     Aditya Srivastava <yashsri421@...il.com>
Cc:     lukas.bulwahn@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] checkpatch: add fix option for LOGICAL_CONTINUATIONS

On Sat, 2020-11-21 at 17:45 +0530, Aditya Srivastava wrote:
> Currently, checkpatch warns if logical continuations are placed at the
> start of a line and not at the end of previous line.
> 
> E.g., running checkpatch on commit 3485507fc272 ("staging:
> bcm2835-camera: Reduce length of enum names") reports:
> 
> CHECK:LOGICAL_CONTINUATIONS: Logical continuations should be on the
> previous line
> +	if (!ret
> +	    && camera_port ==
> 
> Provide a simple fix by adding logical operator at the end of previous
> line and removing from current line, if both the lines are additions
> (ie start with '+')
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3553,8 +3553,14 @@ sub process {
>  
> 
>  # check for && or || at the start of a line
>  		if ($rawline =~ /^\+\s*(&&|\|\|)/) {
> -			CHK("LOGICAL_CONTINUATIONS",
> -			    "Logical continuations should be on the previous line\n" . $hereprev);
> +			my $operator = $1;
> +			if (CHK("LOGICAL_CONTINUATIONS",
> +				"Logical continuations should be on the previous line\n" . $hereprev) &&
> +			    $fix && $prevrawline =~ /^\+/) {
> +				# add logical operator to the previous line, remove from current line
> +				$fixed[$fixlinenr - 1] .= " $operator";
> +				$fixed[$fixlinenr] =~ s/\Q$operator\E\s*//;
> +			}

One thing to be concerned about is a statement like

	if (foo		// comment
	    && bar)

This should really perform the insertion at the last
non-comment, non-whitespace char of the previous line.