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Subject: Re: [PATCH v3] checkpatch: add fix option for
 ASSIGNMENT_CONTINUATIONS
To:     joe@perches.com
Cc:     linux-kernel-mentees@lists.linuxfoundation.org,
        linux-kernel@vger.kernel.org, lukas.bulwahn@gmail.com
References: <20201117171856.13284-1-yashsri421@gmail.com>
From:   Aditya <yashsri421@gmail.com>
Message-ID: <48f56f40-a365-faac-542d-0e120fcf4365@gmail.com>
Date:   Fri, 20 Nov 2020 16:11:12 +0530
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On 17/11/20 10:48 pm, Aditya Srivastava wrote:
> Currently, checkpatch warns us if an assignment operator is placed
> at the start of a line and not at the end of previous line.
> 
> E.g., running checkpatch on commit 8195b1396ec8 ("hv_netvsc: fix
> deadlock on hotplug") reports:
> 
> CHECK: Assignment operator '=' should be on the previous line
> +	struct netvsc_device *nvdev
> +		= container_of(w, struct netvsc_device, subchan_work);
> 
> Provide a simple fix by appending assignment operator to the previous
> line and removing from the current line, if both the lines are additions
> (ie start with '+')
> 
> Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
> ---
> Changes in v2:
> add check if both the lines are additions (ie start with '+')
> 
> Changes in v3:
> quote $operator; test with division assignment operator ('/=')
> 
>  scripts/checkpatch.pl | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index c9aaaa443265..d5bc4d8e4f6c 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -3542,8 +3542,14 @@ sub process {
>  
>  # check for assignments on the start of a line
>  		if ($sline =~ /^\+\s+($Assignment)[^=]/) {
> -			CHK("ASSIGNMENT_CONTINUATIONS",
> -			    "Assignment operator '$1' should be on the previous line\n" . $hereprev);
> +			my $operator = "$1";
> +			if (CHK("ASSIGNMENT_CONTINUATIONS",
> +				"Assignment operator '$1' should be on the previous line\n" . $hereprev) &&
> +			    $fix && $prevrawline =~ /^\+/) {
> +				# add assignment operator to the previous line, remove from current line
> +				$fixed[$fixlinenr - 1] .= " $operator";
> +				$fixed[$fixlinenr] =~ s/$operator\s*//;
> +			}
>  		}
>  
>  # check for && or || at the start of a line
> 

Hi Joe
This patch probably got missed. Please review :)

Thanks
Aditya