linux-kernel - Re: [PATCH] usb: raw-gadget: upgrade license identifier

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Date:   Sun, 26 Dec 2021 06:02:19 -0800
From:   Joe Perches <joe@...ches.com>
To:     Andrey Konovalov <andreyknvl@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     andrey.konovalov@...ux.dev, Felipe Balbi <balbi@...nel.org>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: raw-gadget: upgrade license identifier

On Sun, 2021-12-26 at 14:19 +0100, Andrey Konovalov wrote:
> I wonder if checkpatch could alert about considering GPL-2.0+ when
> adding new files.

No. Licensing is up to the author/submitter.

One nit checkpatch could warn about is the use of MODULE_LICENSE("GPL v2")
rather than MODULE_LICENSE("GPL") as that's an unnecessary distinction.

See: https://lore.kernel.org/all/alpine.DEB.2.21.1901282105450.1669@nanos.tec.linutronix.de/

Given there are a several thousand existing uses of "GPL v2" in the
kernel, do this check only for new patches and not existing files.
---
 scripts/checkpatch.pl | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b01c36a15d9dd..5b00f1f491aff 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7418,6 +7418,10 @@ sub process {
 				WARN("MODULE_LICENSE",
 				     "unknown module license " . $extracted_string . "\n" . $herecurr);
 			}
+			if (!$file && $extracted_string eq '"GPL v2"') {
+				WARN("MODULE_LICENSE",
+				     "Prefer \"GPL\" over \"GPL v2\" - see: https://lore.kernel.org/all/alpine.DEB.2.21.1901282105450.1669\@nanos.tec.linutronix.de/\n" . $herecurr);
+			}
 		}
 
 # check for sysctl duplicate constants