linux-kernel - Re: [PATCH] scripts: checkpatch: allow case x: return #x macros

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Date:   Thu, 27 Oct 2022 04:15:53 -0700
From:   Joe Perches <joe@...ches.com>
To:     Stanislaw Gruszka <stf_xl@...pl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>
Cc:     Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts: checkpatch: allow case x: return #x macros

On Thu, 2022-10-27 at 12:49 +0200, Stanislaw Gruszka wrote:
> Do not report errors like below:
> 
> ./scripts/checkpatch.pl -f drivers/net/wireless/ath/ath10k/wmi.h
> 
> ERROR: Macros with complex values should be enclosed in parentheses
> +#define C2S(x) case x: return #x
> 
> since "case x: return #x" macros are already used by some
> in-kernel drivers.
> 
> Signed-off-by: Stanislaw Gruszka <stf_xl@...pl>
> ---
>  scripts/checkpatch.pl | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 1e5e66ae5a52..4b888b1313d5 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -5901,6 +5901,7 @@ sub process {
>  			    $dstat !~ /$exceptions/ &&
>  			    $dstat !~ /^\.$Ident\s*=/ &&				# .foo =
>  			    $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&		# stringification #foo
> +			    $dstat !~ /^case\s*$Ident:\s*return\s*#$Ident$/ &&		# case x: return #x

I think there needs to be a \s+ not \s* after return

And try this grep and see how many of these are handled

$ git grep -P -n '^\s*#\s*define.*\bcase.*#'

It may be better to just use

			    $dstat !~ /^case\b/ &&

$ git grep -P -n '^\s*#\s*define\s+\w+\([^\)]+\)\s*case\b'