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Date:	Mon, 06 Apr 2015 17:17:02 -0700
From:	Joe Perches <joe@...ches.com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: validate MODULE_LICENSE content

On Mon, 2015-04-06 at 11:43 -0700, Bjorn Andersson wrote:
> There is a well defined list of expected values for MODULE_LICENSE so
> warn the user upon usage of unknown values.

Hello Bjorn

A few nits:

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -5354,6 +5354,22 @@ sub process {
>  				}
>  			}
>  		}
> +
> +		if ($line =~ /MODULE_LICENSE\(($String)\)/) {

As there are uses with spaces, this would be better as:

		if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) {

> +			my $extracted_string = get_quoted_string($line, $rawline);
> +			my $valid_licenses = qr{
> +						GPL|
> +						GPL\ v2|
> +						GPL\ and\ additional\ rights|
> +						Dual\ BSD/GPL|
> +						Dual\ MIT/GPL|
> +						Dual\ MPL/GPL|
> +						Proprietary

Why add "Proprietary" ?

This is the list I get in the current tree:
(after collapsing spaces in a few places)

   5920 MODULE_LICENSE("GPL")
   1211 MODULE_LICENSE("GPL v2")
    187 MODULE_LICENSE("Dual BSD/GPL")
     37 MODULE_LICENSE("GPL and additional rights")
     26 MODULE_LICENSE("Dual MPL/GPL")
      1 MODULE_LICENSE("Dual MIT/GPL")
      1 MODULE_LICENSE("BSD")

> +					}x;
> +			if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) {
> +				WARN("MODULE_LICENSE", "unknown module license " . $extracted_string . "\n" . $herecurr);

I'd write this on 2 lines in the same fashion as
all the other warnings:

				WARN("MODULE_LICENSE",
				     "unknown module license $extracted_string\n" . $herecurr);

Other than those minor issues, it seems sensible enough.

thanks,  Joe

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