linux-kernel - Re: SPDX-License-Identifier

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Message-ID: <20150226214949.GA10204@amd>
Date:	Thu, 26 Feb 2015 22:49:49 +0100
From:	Pavel Machek <pavel@...x.de>
To:	Felipe Balbi <balbi@...com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stefan Roese <sr@...x.de>, monstr@...str.eu,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Wolfgang Denk <wd@...x.de>
Subject: Re: SPDX-License-Identifier

On Wed 2015-02-25 16:00:47, Felipe Balbi wrote:
> On Wed, Feb 25, 2015 at 10:49:51PM +0100, Pavel Machek wrote:
> > Hi!
> > 
> > > > >Is one tag per directory sufficient?  Is one tag per file sufficient?
> > > > >How about one tag per package?  If package, then isn't a single tag for
> > > > >the whole kernel source tree sufficient, as we all know the overall
> > > > >license for the kernel source tree.
> > > > 
> > > > We really need one tag per file.
> > > 
> > > I fail to see the justification for this, why?  Why not per directory?
> > > Why not per function?  Why not per driver?  Why not per line?  Why not
> > > per project?  Who has dictated this seemingly arbitrary rule?
> > 
> > That's how licenses are done today.
> > 
> > Why would I like to see SPDX?
> > 
> > So that GPL header at begining of each file becomes one line... and so
> > that if it is BSD/GPL dual licensed is plain to see, and I don't have
> > to read the notices saying "oh this is gpl.. but if you want to,
> > delete gpl above and use license below".
> 
> why isn't git grep -e 'MODULE_LICENSE' enough ? It's also a single line
> and gives you the license for that driver.
> 
> > > Our DCO process ensures that.
> > > 
> > > > - Some parts of the Linux source code are also used by other projects.
> > > >   Or are derived from other projects. Because of this they are
> > > >   explicitly licensed under different licenses than the GPLv2
> > > >   (compatible to it though of course). Or are dual-licensed. So that
> > > >   they can be used by these other projects.
> > > 
> > > That's fine, we encourage that and want to see that happen.  How will
> > > SPDX change that at all?  It's obvious as to the license of the files
> > > that this happens with, why do anything extra?
> > 
> > Well, sometimes parsing license agreements at the top of file is
> > interesting, that's where SPDX would help, and that's why having
> > single SPDX per linux kernel would not work.
> 
> if you can parse SPDX, why can't you parse MODULE_LICENSE() ?

Not all sources are modules. And yes, MODULE_LICENSE() helps, but spdx
would help, too: This would become one line.

								Pavel

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