linux-kernel - Re: [PATCH] checkpatch: fix unescaped left braces

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Date:   Tue, 05 Jan 2021 02:01:09 -0800
From:   Joe Perches <joe@...ches.com>
To:     Dwaipayan Ray <dwaipayanray1@...il.com>
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, lukas.bulwahn@...il.com
Subject: Re: [PATCH] checkpatch: fix unescaped left braces

On Tue, 2021-01-05 at 15:05 +0530, Dwaipayan Ray wrote:
> Perl 5.22 onwards require that "A literal "{" should now be
> escaped in a pattern".

Not quite correct.

> checkpatch contains several literal "{". Fix such instances
> by preceding them with a backslash.

Not all literal left braces need to be escaped.
https://www.perlmonks.org/?node_id=1191981

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -2036,7 +2036,7 @@ sub annotate_values {
>  			print "ASSIGN($1)\n" if ($dbg_values > 1);
>  			$type = 'N';
>  
> 
> -		} elsif ($cur =~/^(;|{|})/) {
> +		} elsif ($cur =~ /^(;|\{|\})/) {

Like this one.  And why escape the right brace too?

>  			print "END($1)\n" if ($dbg_values > 1);
>  			$type = 'E';
>  			$av_pend_colon = 'O';
> @@ -3913,7 +3913,7 @@ sub process {
>  			# it there is no point in retrying a statement scan
>  			# until we hit end of it.
>  			my $frag = $stat; $frag =~ s/;+\s*$//;
> -			if ($frag !~ /(?:{|;)/) {
> +			if ($frag !~ /(?:\{|;)/) {

And here.

etc...